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# std.net.curl

Networking client functionality as provided by libcurl. The libcurl library must be installed on the system in order to use this module.

Category | Functions
--- | ---
High level | download upload get post put del options trace connect byLine byChunk byLineAsync byChunkAsync
Low level | HTTP FTP SMTP

Note You may need to link to the `curl` library, e.g. by adding "libs": ["`curl`"] to your dub.json file if you are using DUB.

Windows x86 note: A DMD compatible libcurl static library can be downloaded from the dlang.org download page.
Compared to using libcurl directly this module allows simpler client code for common uses, requires no unsafe operations, and integrates better with the rest of the language. Futhermore it provides range access to protocols supported by libcurl both synchronously and asynchronously.
A high level and a low level API are available. The high level API is built entirely on top of the low level one.
The high level API is for commonly used functionality such as HTTP/FTP get. The byLineAsync and byChunkAsync provides asynchronous ranges that performs the request in another thread while handling a line/chunk in the current thread.
The low level API allows for streaming and other advanced features.

Cheat Sheet
Function Name | Description
--- | ---
High level
download | download("ftp.digitalmars.com/sieve.ds", "/tmp/downloaded-ftp-file") downloads file from URL to file system.
upload | upload("/tmp/downloaded-ftp-file", "ftp.digitalmars.com/sieve.ds"); uploads file from file system to URL.
get | get("dlang.org") returns a char[] containing the dlang.org web page.
put | put("dlang.org", "Hi") returns a char[] containing the dlang.org web page. after a HTTP PUT of "hi"
post | post("dlang.org", "Hi") returns a char[] containing the dlang.org web page. after a HTTP POST of "hi"
byLine | byLine("dlang.org") returns a range of char[] containing the dlang.org web page.
byChunk | byChunk("dlang.org", 10) returns a range of ubyte[10] containing the dlang.org web page.
byLineAsync | byLineAsync("dlang.org") returns a range of char[] containing the dlang.org web page asynchronously.
byChunkAsync | byChunkAsync("dlang.org", 10) returns a range of ubyte[10] containing the dlang.org web page asynchronously.
Low level
HTTP | HTTP struct for advanced usage
FTP | FTP struct for advanced usage
SMTP | SMTP struct for advanced usage

Example

    import std.net.curl, std.stdio;

    // Return a char[] containing the content specified by a URL
    auto content = get("dlang.org");

    // Post data and return a char[] containing the content specified by a URL
    auto content = post("mydomain.com/here.cgi", ["name1" : "value1", "name2" : "value2"]);

    // Get content of file from ftp server
    auto content = get("ftp.digitalmars.com/sieve.ds");

    // Post and print out content line by line. The request is done in another thread.
    foreach (line; byLineAsync("dlang.org", "Post data"))
        writeln(line);

    // Get using a line range and proxy settings
    auto client = HTTP();
    client.proxy = "1.2.3.4";
    foreach (line; byLine("dlang.org", client))
        writeln(line);

For more control than the high level functions provide, use the low level API:

Example

    import std.net.curl, std.stdio;

    // GET with custom data receivers
    auto http = HTTP("dlang.org");
    http.onReceiveHeader =
        (in char[] key, in char[] value) { writeln(key, ": ", value); };
    http.onReceive = (ubyte[] data) { /+ drop +/ return data.length; };
    http.perform();

First, an instance of the reference-counted HTTP struct is created. Then the custom delegates are set. These will be called whenever the HTTP instance receives a header and a data buffer, respectively. In this simple example, the headers are written to stdout and the data is ignored. If the request should be stopped before it has finished then return something less than data.length from the onReceive callback. See onReceiveHeader/onReceive for more information. Finally the HTTP request is effected by calling perform(), which is synchronous.

Source std/net/curl.d

License:
Boost License 1.0.
Authors:
Jonas Drewsen. Some of the SMTP code contributed by Jimmy Cao.

Credits The functionally is based on libcurl. LibCurl is licensed under an MIT/X derivative license.

struct `AutoProtocol`;

  Example

      import std.net.curl;
      // Two requests below will do the same.
      string content;

      // Explicit connection provided
      content = get!HTTP("dlang.org");

      // Guess connection type by looking at the URL
      content = get!AutoProtocol("ftp://foo.com/file");
      // and since AutoProtocol is default this is the same as
      content = get("ftp://foo.com/file");
      // and will end up detecting FTP from the url and be the same as
      content = get!FTP("ftp://foo.com/file");

void `download`(Conn = AutoProtocol)(const(char)[] `url`, string `saveToPath`, Conn `conn` = Conn())
if (isCurlConn!Conn);
  HTTP/FTP `download` to local file system.
  Parameters:

  const(char)[] `url` | resource to `download`
  string `saveToPath` | path to store the downloaded content on local disk
  Conn `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only.

  Example

      import std.net.curl;
      download("d-lang.appspot.com/testUrl2", "/tmp/downloaded-http-file");

void `upload`(Conn = AutoProtocol)(string `loadFromPath`, const(char)[] `url`, Conn `conn` = Conn())
if (isCurlConn!Conn);
  Upload file from local files system using the HTTP or FTP protocol.
  Parameters:

  string `loadFromPath` | path load data from local disk.
  const(char)[] `url` | resource to `upload` to
  Conn `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only.

  Example

      import std.net.curl;
      upload("/tmp/downloaded-ftp-file", "ftp.digitalmars.com/sieve.ds");
      upload("/tmp/downloaded-http-file", "d-lang.appspot.com/testUrl2");

T[] `get`(Conn = AutoProtocol, T = char)(const(char)[] `url`, Conn `conn` = Conn())
if (isCurlConn!Conn && (is(T == char) || is(T == ubyte)));
  HTTP/FTP `get` content.
  Parameters:

  const(char)[] `url` | resource to `get`
  Conn `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only. The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[]. If asking for char, content will be converted from the connection character set (specified in HTTP response headers or FTP connection properties, both ISO-8859-1 by default) to UTF-8.

  Example

      import std.net.curl;
      auto content = get("d-lang.appspot.com/testUrl2");

  Returns:
  A T[] range containing the content of the resource pointed to by the URL.
  Throws:
  CurlException on error.
  See Also:
  HTTP.Method
T[] `post`(T = char, PostUnit)(const(char)[] `url`, const(PostUnit)[] `postData`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
T[] `post`(T = char)(const(char)[] `url`, string[string] `postDict`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
  HTTP `post` content.
  Parameters:

  const(char)[] `url` | resource to `post` to
  string[string] `postDict` | data to send as the body of the request. An associative array of string is accepted and will be encoded using www-form-urlencoding
  const(PostUnit)[] `postData` | data to send as the body of the request. An array of an arbitrary type is accepted and will be cast to ubyte[] before sending it.
  HTTP `conn` | HTTP connection to use
  T | The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[]. If asking for char, content will be converted from the connection character set (specified in HTTP response headers or FTP connection properties, both ISO-8859-1 by default) to UTF-8.

  Examples:

      import std.net.curl;

      auto content1 = post("d-lang.appspot.com/testUrl2", ["name1" : "value1", "name2" : "value2"]);
      auto content2 = post("d-lang.appspot.com/testUrl2", [1,2,3,4]);

  Returns:
  A T[] range containing the content of the resource pointed to by the URL.
  See Also:
  HTTP.Method
T[] `put`(Conn = AutoProtocol, T = char, PutUnit)(const(char)[] `url`, const(PutUnit)[] `putData`, Conn `conn` = Conn())
if (isCurlConn!Conn && (is(T == char) || is(T == ubyte)));
  HTTP/FTP `put` content.
  Parameters:

  const(char)[] `url` | resource to `put`
  const(PutUnit)[] `putData` | data to send as the body of the request. An array of an arbitrary type is accepted and will be cast to ubyte[] before sending it.
  Conn `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only. The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[]. If asking for char, content will be converted from the connection character set (specified in HTTP response headers or FTP connection properties, both ISO-8859-1 by default) to UTF-8.

  Example

      import std.net.curl;
      auto content = put("d-lang.appspot.com/testUrl2",
                           "Putting this data");

  Returns:
  A T[] range containing the content of the resource pointed to by the URL.
  See Also:
  HTTP.Method
void `del`(Conn = AutoProtocol)(const(char)[] `url`, Conn `conn` = Conn())
if (isCurlConn!Conn);
  HTTP/FTP delete content.
  Parameters:

  const(char)[] `url` | resource to delete
  Conn `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only.

  Example

      import std.net.curl;
      del("d-lang.appspot.com/testUrl2");

  See Also:
  HTTP.Method
T[] `options`(T = char)(const(char)[] `url`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
  HTTP `options` request.
  Parameters:

  const(char)[] `url` | resource make a option call to
  HTTP `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only. The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[].

  Example

      import std.net.curl;
      auto http = HTTP();
      options("d-lang.appspot.com/testUrl2", http);
      writeln("Allow set to " ~ http.responseHeaders["Allow"]);

  Returns:
  A T[] range containing the `options` of the resource pointed to by the URL.
  See Also:
  HTTP.Method
T[] `trace`(T = char)(const(char)[] `url`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
  HTTP `trace` request.
  Parameters:

  const(char)[] `url` | resource make a `trace` call to
  HTTP `conn` | connection to use e.g. FTP or HTTP. The default AutoProtocol will guess connection type and create a new instance for this call only. The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[].

  Example

      import std.net.curl;
      trace("d-lang.appspot.com/testUrl1");

  Returns:
  A T[] range containing the `trace` info of the resource pointed to by the URL.
  See Also:
  HTTP.Method
T[] `connect`(T = char)(const(char)[] `url`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
  HTTP `connect` request.
  Parameters:

  const(char)[] `url` | resource make a `connect` to
  HTTP `conn` | HTTP connection to use The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[].

  Example

      import std.net.curl;
      connect("d-lang.appspot.com/testUrl1");

  Returns:
  A T[] range containing the `connect` info of the resource pointed to by the URL.
  See Also:
  HTTP.Method
T[] `patch`(T = char, PatchUnit)(const(char)[] `url`, const(PatchUnit)[] `patchData`, HTTP `conn` = HTTP())
if (is(T == char) || is(T == ubyte));
  HTTP `patch` content.
  Parameters:

  const(char)[] `url` | resource to `patch`
  const(PatchUnit)[] `patchData` | data to send as the body of the request. An array of an arbitrary type is accepted and will be cast to ubyte[] before sending it.
  HTTP `conn` | HTTP connection to use The template parameter T specifies the type to return. Possible values are char and ubyte to return char[] or ubyte[].

  Example

      auto http = HTTP();
      http.addRequestHeader("Content-Type", "application/json");
      auto content = patch("d-lang.appspot.com/testUrl2", `{"title": "Patched Title"}`, http);

  Returns:
  A T[] range containing the content of the resource pointed to by the URL.
  See Also:
  HTTP.Method
auto `byLine`(Conn = AutoProtocol, Terminator = char, Char = char)(const(char)[] `url`, KeepTerminator `keepTerminator` = No.`keepTerminator`, Terminator `terminator` = '\x0a', Conn `conn` = Conn())
if (isCurlConn!Conn && isSomeChar!Char && isSomeChar!Terminator);
  HTTP/FTP fetch content as a range of lines.
  A range of lines is returned when the request is complete. If the method or other request properties is to be customized then set the `conn` parameter with a HTTP/FTP instance that has these properties set.

  Example

      import std.net.curl, std.stdio;
      foreach (line; byLine("dlang.org"))
          writeln(line);

  Parameters:

  const(char)[] `url` | The `url` to receive content from
  KeepTerminator `keepTerminator` | Yes.`keepTerminator` signals that the line `terminator` should be returned as part of the lines in the range.
  Terminator `terminator` | The character that terminates a line
  Conn `conn` | The connection to use e.g. HTTP or FTP.

  Returns:
  A range of Char[] with the content of the resource pointer to by the URL
auto `byChunk`(Conn = AutoProtocol)(const(char)[] `url`, size_t `chunkSize` = 1024, Conn `conn` = Conn())
if (isCurlConn!Conn);
  HTTP/FTP fetch content as a range of chunks.
  A range of chunks is returned when the request is complete. If the method or other request properties is to be customized then set the `conn` parameter with a HTTP/FTP instance that has these properties set.

  Example

      import std.net.curl, std.stdio;
      foreach (chunk; byChunk("dlang.org", 100))
          writeln(chunk); // chunk is ubyte[100]

  Parameters:

  const(char)[] `url` | The `url` to receive content from
  size_t `chunkSize` | The size of each chunk
  Conn `conn` | The connection to use e.g. HTTP or FTP.

  Returns:
  A range of ubyte[`chunkSize`] with the content of the resource pointer to by the URL
auto `byLineAsync`(Conn = AutoProtocol, Terminator = char, Char = char, PostUnit)(const(char)[] `url`, const(PostUnit)[] `postData`, KeepTerminator `keepTerminator` = No.`keepTerminator`, Terminator `terminator` = '\x0a', size_t `transmitBuffers` = 10, Conn `conn` = Conn())
if (isCurlConn!Conn && isSomeChar!Char && isSomeChar!Terminator);
auto `byLineAsync`(Conn = AutoProtocol, Terminator = char, Char = char)(const(char)[] `url`, KeepTerminator `keepTerminator` = No.`keepTerminator`, Terminator `terminator` = '\x0a', size_t `transmitBuffers` = 10, Conn `conn` = Conn());
  HTTP/FTP fetch content as a range of lines asynchronously.
  A range of lines is returned immediately and the request that fetches the lines is performed in another thread. If the method or other request properties is to be customized then set the `conn` parameter with a HTTP/FTP instance that has these properties set.
  If `postData` is non-null the method will be set to post for HTTP requests.
  The background thread will buffer up to `transmitBuffers` number of lines before it stops receiving data from network. When the main thread reads the lines from the range it frees up buffers and allows for the background thread to receive more data from the network.
  If no data is available and the main thread accesses the range it will block until data becomes available. An exception to this is the wait(Duration) method on the AsyncLineInputRange. This method will wait at maximum for the specified duration and return `true` if data is available.

  Example

      import std.net.curl, std.stdio;
      // Get some pages in the background
      auto range1 = byLineAsync("www.google.com");
      auto range2 = byLineAsync("www.wikipedia.org");
      foreach (line; byLineAsync("dlang.org"))
          writeln(line);

      // Lines already fetched in the background and ready
      foreach (line; range1) writeln(line);
      foreach (line; range2) writeln(line);

      import std.net.curl, std.stdio;
      // Get a line in a background thread and wait in
      // main thread for 2 seconds for it to arrive.
      auto range3 = byLineAsync("dlang.com");
      if (range3.wait(dur!"seconds"(2)))
          writeln(range3.front);
      else
          writeln("No line received after 2 seconds!");

  Parameters:

  const(char)[] `url` | The `url` to receive content from
  const(PostUnit)[] `postData` | Data to HTTP Post
  KeepTerminator `keepTerminator` | Yes.`keepTerminator` signals that the line `terminator` should be returned as part of the lines in the range.
  Terminator `terminator` | The character that terminates a line
  size_t `transmitBuffers` | The number of lines buffered asynchronously
  Conn `conn` | The connection to use e.g. HTTP or FTP.

  Returns:
  A range of Char[] with the content of the resource pointer to by the URL.
auto `byChunkAsync`(Conn = AutoProtocol, PostUnit)(const(char)[] `url`, const(PostUnit)[] `postData`, size_t `chunkSize` = 1024, size_t `transmitBuffers` = 10, Conn `conn` = Conn())
if (isCurlConn!Conn);
auto `byChunkAsync`(Conn = AutoProtocol)(const(char)[] `url`, size_t `chunkSize` = 1024, size_t `transmitBuffers` = 10, Conn `conn` = Conn())
if (isCurlConn!Conn);
  HTTP/FTP fetch content as a range of chunks asynchronously.
  A range of chunks is returned immediately and the request that fetches the chunks is performed in another thread. If the method or other request properties is to be customized then set the `conn` parameter with a HTTP/FTP instance that has these properties set.
  If `postData` is non-null the method will be set to post for HTTP requests.
  The background thread will buffer up to `transmitBuffers` number of chunks before is stops receiving data from network. When the main thread reads the chunks from the range it frees up buffers and allows for the background thread to receive more data from the network.
  If no data is available and the main thread access the range it will block until data becomes available. An exception to this is the wait(Duration) method on the AsyncChunkInputRange. This method will wait at maximum for the specified duration and return `true` if data is available.

  Example

      import std.net.curl, std.stdio;
      // Get some pages in the background
      auto range1 = byChunkAsync("www.google.com", 100);
      auto range2 = byChunkAsync("www.wikipedia.org");
      foreach (chunk; byChunkAsync("dlang.org"))
          writeln(chunk); // chunk is ubyte[100]

      // Chunks already fetched in the background and ready
      foreach (chunk; range1) writeln(chunk);
      foreach (chunk; range2) writeln(chunk);

      import std.net.curl, std.stdio;
      // Get a line in a background thread and wait in
      // main thread for 2 seconds for it to arrive.
      auto range3 = byChunkAsync("dlang.com", 10);
      if (range3.wait(dur!"seconds"(2)))
          writeln(range3.front);
      else
          writeln("No chunk received after 2 seconds!");

  Parameters:

  const(char)[] `url` | The `url` to receive content from
  const(PostUnit)[] `postData` | Data to HTTP Post
  size_t `chunkSize` | The size of the chunks
  size_t `transmitBuffers` | The number of chunks buffered asynchronously
  Conn `conn` | The connection to use e.g. HTTP or FTP.

  Returns:
  A range of ubyte[`chunkSize`] with the content of the resource pointer to by the URL.
struct `HTTP`;
  `HTTP` client functionality.

  Example

      import std.net.curl, std.stdio;

      // Get with custom data receivers
      auto http = HTTP("dlang.org");
      http.onReceiveHeader =
          (in char[] key, in char[] value) { writeln(key ~ ": " ~ value); };
      http.onReceive = (ubyte[] data) { /+ drop +/ return data.length; };
      http.perform();

      // Put with data senders
      auto msg = "Hello world";
      http.contentLength = msg.length;
      http.onSend = (void[] data)
      {
          auto m = cast(void[]) msg;
          size_t len = m.length > data.length ? data.length : m.length;
          if (len == 0) return len;
          data[0 .. len] = m[0 .. len];
          msg = msg[len..$];
          return len;
      };
      http.perform();

      // Track progress
      http.method = HTTP.Method.get;
      http.url = "http://upload.wikimedia.org/wikipedia/commons/"
                 "5/53/Wikipedia-logo-en-big.png";
      http.onReceive = (ubyte[] data) { return data.length; };
      http.onProgress = (size_t dltotal, size_t dlnow,
                         size_t ultotal, size_t ulnow)
      {
          writeln("Progress ", dltotal, ", ", dlnow, ", ", ultotal, ", ", ulnow);
          return 0;
      };
      http.perform();

  See Also:
  RFC2616
  alias `AuthMethod` = etc.c.curl.CurlAuth;
    Authentication method equal to etc.c.curl.CurlAuth
  alias `TimeCond` = etc.c.curl.CurlTimeCond;
    Time condition enumeration as an alias of etc.c.curl.CurlTimeCond
    RFC2616 Section 14.25
  static HTTP `opCall`(const(char)[] `url`);
    Constructor taking the `url` as parameter.
  static HTTP `opCall`();
  HTTP `dup`();
  CurlCode `perform`(ThrowOnError `throwOnError` = Yes.`throwOnError`);
    Perform a http request.
    After the HTTP client has been setup and possibly assigned callbacks the `perform`() method will start performing the request towards the specified server.
    Parameters:

    ThrowOnError `throwOnError` | whether to throw an exception or return a CurlCode on error

  @property void `url`(const(char)[] `url`);
    The URL to specify the location of the resource.
  @property void `caInfo`(const(char)[] `caFile`);
    Set the CA certificate bundle file to use for SSL peer verification
  alias `requestPause` = etc.c.curl.CurlReadFunc.pause;
    Value to return from onSend/onReceive delegates in order to pause a request
  alias `requestAbort` = etc.c.curl.CurlReadFunc.abort;
    Value to return from onSend delegate in order to abort a request
  @property bool `isStopped`();
    True if the instance is stopped. A stopped instance is not usable.
  void `shutdown`();
    Stop and invalidate this instance.
  @property void `verbose`(bool `on`);
    Set `verbose`. This will print request information to stderr.
  @property void `dataTimeout`(Duration `d`);
    Set timeout for activity on connection.
  @property void `operationTimeout`(Duration `d`);
    Set maximum time an operation is allowed to take. This includes dns resolution, connecting, data transfer, etc.
  @property void `connectTimeout`(Duration `d`);
    Set timeout for connecting.
  @property void `proxy`(const(char)[] `host`);
    Proxy

    See proxy

  @property void `proxyPort`(ushort `port`);
    Proxy `port`

    See proxy_port

  alias `CurlProxy` = etc.c.curl.`CurlProxy`;
    Type of proxy
  @property void `proxyType`(CurlProxy `type`);
    Proxy `type`

    See proxy_type

  @property void `dnsTimeout`(Duration `d`);
    DNS lookup timeout.
  @property void `netInterface`(const(char)[] `i`);
  @property void `netInterface`(const(ubyte)[4] `i`);
  @property void `netInterface`(InternetAddress `i`);
    The network interface to use in form of the the IP of the interface.

    Example

        theprotocol.netInterface = "192.168.1.32";
        theprotocol.netInterface = [ 192, 168, 1, 32 ];

    See std.socket.InternetAddress

  @property void `localPort`(ushort `port`);
    Set the local outgoing `port` to use.
    Parameters:

    ushort `port` | the first outgoing `port` number to try and use

  @property void `localPortRange`(ushort `range`);
    Set the local outgoing port `range` to use. This can be used together with the localPort property.
    Parameters:

    ushort `range` | if the first port is occupied then try this many port number forwards

  @property void `tcpNoDelay`(bool `on`);
    Set the tcp no-delay socket option `on` or off.

    See nodelay

  void `setAuthentication`(const(char)[] `username`, const(char)[] `password`, const(char)[] `domain` = "");
    Set the user name, `password` and optionally `domain` for authentication purposes.
    Some protocols may need authentication in some cases. Use this function to provide credentials.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`
    const(char)[] `domain` | used for NTLM authentication only and is set to the NTLM `domain` name

  void `setProxyAuthentication`(const(char)[] `username`, const(char)[] `password`);
    Set the user name and `password` for proxy authentication.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`

  @property void `onSend`(size_t delegate(void[]) `callback`);
    The event handler that gets called when data is needed for sending. The length of the void[] specifies the maximum number of bytes that can be sent.
    Returns:
    The `callback` returns the number of elements in the buffer that have been filled and are ready to send. The special value .abortRequest can be returned in order to abort the current request. The special value .pauseRequest can be returned in order to pause the current request.

    Example

        import std.net.curl;
        string msg = "Hello world";
        auto client = HTTP("dlang.org");
        client.onSend = delegate size_t(void[] data)
        {
            auto m = cast(void[]) msg;
            size_t length = m.length > data.length ? data.length : m.length;
            if (length == 0) return 0;
            data[0 .. length] = m[0 .. length];
            msg = msg[length..$];
            return length;
        };
        client.perform();

  @property void `onReceive`(size_t delegate(ubyte[]) `callback`);
    The event handler that receives incoming data. Be sure to copy the incoming ubyte[] since it is not guaranteed to be valid after the `callback` returns.
    Returns:
    The `callback` returns the incoming bytes read. If not the entire array is the request will abort. The special value .pauseRequest can be returned in order to pause the current request.

    Example

        import std.net.curl, std.stdio;
        auto client = HTTP("dlang.org");
        client.onReceive = (ubyte[] data)
        {
            writeln("Got data", to!(const(char)[])(data));
            return data.length;
        };
        client.perform();

  @property void `onProgress`(int delegate(size_t dlTotal, size_t dlNow, size_t ulTotal, size_t ulNow) `callback`);
    Register an event handler that gets called to inform of upload/download progress.

    Callback parameters

    `dlTotal` | total bytes to download
    `dlNow` | currently downloaded bytes
    `ulTotal` | total bytes to upload
    `ulNow` | currently uploaded bytes

    Connection type used when the URL should be used to auto detect the protocol. This struct is used as placeholder for the connection parameter when calling the high level API and the connection type (HTTP/FTP) should be guessed by inspecting the URL parameter. The rules for guessing the protocol are: 1, if URL starts with ftp://, ftps:// or ftp. then FTP connection is assumed. 2, HTTP connection otherwise.

    Callback returns Return 0 to signal success, return non-zero to abort transfer.

    Example

        import std.net.curl, std.stdio;
        auto client = HTTP("dlang.org");
        client.onProgress = delegate int(size_t dl, size_t dln, size_t ul, size_t ult)
        {
            writeln("Progress: downloaded ", dln, " of ", dl);
            writeln("Progress: uploaded ", uln, " of ", ul);
        };
        client.perform();

  void `clearRequestHeaders`();
    Clear all outgoing headers.
  void `addRequestHeader`(const(char)[] `name`, const(char)[] `value`);
    Add a header e.g. "X-CustomField: Something is fishy".
    There is no remove header functionality. Do a clearRequestHeaders and set the needed headers instead.

    Example

        import std.net.curl;
        auto client = HTTP();
        client.addRequestHeader("X-Custom-ABC", "This is the custom value");
        auto content = get("dlang.org", client);

  static @property string `defaultUserAgent`();
    The default "User-Agent" value send with a request. It has the form "Phobos-std.net.curl/PHOBOS_VERSION (libcurl/CURL_VERSION)"
  void `setUserAgent`(const(char)[] `userAgent`);
    Set the value of the user agent request header field.
    By default a request has it's "User-Agent" field set to defaultUserAgent even if `setUserAgent` was never called. Pass an empty string to suppress the "User-Agent" field altogether.
  CurlCode `getTiming`(CurlInfo `timing`, ref double `val`);
    Get various timings defined in etc.c.curl.CurlInfo. The value is usable only if the return value is equal to etc.c.curl.CurlError.ok.
    Parameters:

    CurlInfo `timing` | one of the timings defined in etc.c.curl.CurlInfo. The values are: etc.c.curl.CurlInfo.namelookup_time, etc.c.curl.CurlInfo.connect_time, etc.c.curl.CurlInfo.pretransfer_time, etc.c.curl.CurlInfo.starttransfer_time, etc.c.curl.CurlInfo.redirect_time, etc.c.curl.CurlInfo.appconnect_time, etc.c.curl.CurlInfo.total_time.
    double `val` | the actual value of the inquired `timing`.

    Returns:
    The return code of the operation. The value stored in `val` should be used only if the return value is etc.c.curl.CurlInfo.ok.

    Example

        import std.net.curl;
        import etc.c.curl : CurlError, CurlInfo;

        auto client = HTTP("dlang.org");
        client.perform();

        double val;
        CurlCode code;

        code = client.getTiming(CurlInfo.namelookup_time, val);
        assert(code == CurlError.ok);

  @property string[string] `responseHeaders`();
    The headers read from a successful response.
  @property void `method`(Method `m`);
  @property Method `method`();
    HTTP `method` used.
  @property StatusLine `statusLine`();
    HTTP status line of last response. One call to perform may result in several requests because of redirection.
  void `setCookie`(const(char)[] `cookie`);
    Set the active `cookie` string e.g. "name1=value1;name2=value2"
  void `setCookieJar`(const(char)[] `path`);
    Set a file `path` to where a cookie jar should be read/stored.
  void `flushCookieJar`();
    Flush cookie jar to disk.
  void `clearSessionCookies`();
    Clear session cookies.
  void `clearAllCookies`();
    Clear all cookies.
  void `setTimeCondition`(HTTP.TimeCond `cond`, SysTime `timestamp`);
    Set time condition on the request.
    Parameters:

    HTTP.TimeCond `cond` | CurlTimeCond.{none,ifmodsince,ifunmodsince,lastmod}
    SysTime `timestamp` | Timestamp for the condition RFC2616 Section 14.25

  @property void `postData`(const(void)[] `data`);
    Specifying `data` to post when not using the onSend callback.
    The `data` is NOT copied by the library. Content-Type will default to application/octet-stream. Data is not converted or encoded by this method.

    Example

        import std.net.curl, std.stdio;
        auto http = HTTP("http://www.mydomain.com");
        http.onReceive = (ubyte[] data) { writeln(to!(const(char)[])(data)); return data.length; };
        http.postData = [1,2,3,4,5];
        http.perform();

  @property void `postData`(const(char)[] `data`);
    Specifying `data` to post when not using the onSend callback.
    The `data` is NOT copied by the library. Content-Type will default to text/plain. Data is not converted or encoded by this method.

    Example

        import std.net.curl, std.stdio;
        auto http = HTTP("http://www.mydomain.com");
        http.onReceive = (ubyte[] data) { writeln(to!(const(char)[])(data)); return data.length; };
        http.postData = "The quick....";
        http.perform();

  void `setPostData`(const(void)[] `data`, string `contentType`);
    Specify `data` to post when not using the onSend callback, with user-specified Content-Type.
    Parameters:

    const(void)[] `data` | Data to post.
    string `contentType` | MIME type of the `data`, for example, "text/plain" or "application/octet-stream". See also: Internet media type on Wikipedia.
        import std.net.curl;
        auto http = HTTP("http://onlineform.example.com");
        auto data = "app=login&username=bob&password=s00perS3kret";
        http.setPostData(data, "application/x-www-form-urlencoded");
        http.onReceive = (ubyte[] data) { return data.length; };
        http.perform();

  @property void `onReceiveHeader`(void delegate(in char[] key, in char[] value) `callback`);
    Set the event handler that receives incoming headers.
    The `callback` will receive a header field key, value as parameter. The const(char)[] arrays are not valid after the delegate has returned.

    Example

        import std.net.curl, std.stdio;
        auto http = HTTP("dlang.org");
        http.onReceive = (ubyte[] data) { writeln(to!(const(char)[])(data)); return data.length; };
        http.onReceiveHeader = (in char[] key, in char[] value) { writeln(key, " = ", value); };
        http.perform();

  @property void `onReceiveStatusLine`(void delegate(StatusLine) `callback`);
    Callback for each received StatusLine.
    Notice that several callbacks can be done for each call to perform() due to redirections.
    See Also:
    StatusLine
  @property void `contentLength`(ulong `len`);
    The content length in bytes when using request that has content e.g. POST/PUT and not using chunked transfer. Is set as the "Content-Length" header. Set to ulong.max to reset to chunked transfer.
  @property void `authenticationMethod`(AuthMethod `authMethod`);
    Authentication method as specified in AuthMethod.
  @property void `maxRedirects`(uint `maxRedirs`);
    Set max allowed redirections using the location header. uint.max for infinite.
  enum `Method`: int;
    The standard HTTP methods : RFC2616 Section 5.1.1
    `head`
    `get`
    `post`
    `put`
    `del`
    `options`
    `trace`
    `connect`
    `patch`
  struct `StatusLine`;
    HTTP status line ie. the first line returned in an HTTP response.
    If authentication or redirections are done then the status will be for the last response received.
    ushort `majorVersion`;
      Major HTTP version ie. 1 in HTTP/1.0.
    ushort `minorVersion`;
      Minor HTTP version ie. 0 in HTTP/1.0.
    ushort `code`;
      HTTP status line `code` e.g. 200.
    string `reason`;
      HTTP status line `reason` string.
    @safe void `reset`();
      Reset this status line
    const string `toString`();
struct `FTP`;
  `FTP` client functionality.
  See Also:
  RFC959
  static FTP `opCall`(const(char)[] `url`);
    FTP access to the specified `url`.
  static FTP `opCall`();
  FTP `dup`();
  CurlCode `perform`(ThrowOnError `throwOnError` = Yes.`throwOnError`);
    Performs the ftp request as it has been configured.
    After a FTP client has been setup and possibly assigned callbacks the `perform`() method will start performing the actual communication with the server.
    Parameters:

    ThrowOnError `throwOnError` | whether to throw an exception or return a CurlCode on error

  @property void `url`(const(char)[] `url`);
    The URL to specify the location of the resource.
  alias `requestPause` = etc.c.curl.CurlReadFunc.pause;
    Value to return from onSend/onReceive delegates in order to pause a request
  alias `requestAbort` = etc.c.curl.CurlReadFunc.abort;
    Value to return from onSend delegate in order to abort a request
  @property bool `isStopped`();
    True if the instance is stopped. A stopped instance is not usable.
  void `shutdown`();
    Stop and invalidate this instance.
  @property void `verbose`(bool `on`);
    Set `verbose`. This will print request information to stderr.
  @property void `dataTimeout`(Duration `d`);
    Set timeout for activity on connection.
  @property void `operationTimeout`(Duration `d`);
    Set maximum time an operation is allowed to take. This includes dns resolution, connecting, data transfer, etc.
  @property void `connectTimeout`(Duration `d`);
    Set timeout for connecting.
  @property void `proxy`(const(char)[] `host`);
    Proxy

    See proxy

  @property void `proxyPort`(ushort `port`);
    Proxy `port`

    See proxy_port

  alias `CurlProxy` = etc.c.curl.`CurlProxy`;
    Type of proxy
  @property void `proxyType`(CurlProxy `type`);
    Proxy `type`

    See proxy_type

  @property void `dnsTimeout`(Duration `d`);
    DNS lookup timeout.
  @property void `netInterface`(const(char)[] `i`);
  @property void `netInterface`(const(ubyte)[4] `i`);
  @property void `netInterface`(InternetAddress `i`);
    The network interface to use in form of the the IP of the interface.

    Example

        theprotocol.netInterface = "192.168.1.32";
        theprotocol.netInterface = [ 192, 168, 1, 32 ];

    See std.socket.InternetAddress

  @property void `localPort`(ushort `port`);
    Set the local outgoing `port` to use.
    Parameters:

    ushort `port` | the first outgoing `port` number to try and use

  @property void `localPortRange`(ushort `range`);
    Set the local outgoing port `range` to use. This can be used together with the localPort property.
    Parameters:

    ushort `range` | if the first port is occupied then try this many port number forwards

  @property void `tcpNoDelay`(bool `on`);
    Set the tcp no-delay socket option `on` or off.

    See nodelay

  void `setAuthentication`(const(char)[] `username`, const(char)[] `password`, const(char)[] `domain` = "");
    Set the user name, `password` and optionally `domain` for authentication purposes.
    Some protocols may need authentication in some cases. Use this function to provide credentials.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`
    const(char)[] `domain` | used for NTLM authentication only and is set to the NTLM `domain` name

  void `setProxyAuthentication`(const(char)[] `username`, const(char)[] `password`);
    Set the user name and `password` for proxy authentication.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`

  @property void `onSend`(size_t delegate(void[]) `callback`);
    The event handler that gets called when data is needed for sending. The length of the void[] specifies the maximum number of bytes that can be sent.
    Returns:
    The `callback` returns the number of elements in the buffer that have been filled and are ready to send. The special value .abortRequest can be returned in order to abort the current request. The special value .pauseRequest can be returned in order to pause the current request.
  @property void `onReceive`(size_t delegate(ubyte[]) `callback`);
    The event handler that receives incoming data. Be sure to copy the incoming ubyte[] since it is not guaranteed to be valid after the `callback` returns.
    Returns:
    The `callback` returns the incoming bytes read. If not the entire array is the request will abort. The special value .pauseRequest can be returned in order to pause the current request.
  @property void `onProgress`(int delegate(size_t dlTotal, size_t dlNow, size_t ulTotal, size_t ulNow) `callback`);
    The event handler that gets called to inform of upload/download progress.

    Callback parameters

    `dlTotal` | total bytes to download
    `dlNow` | currently downloaded bytes
    `ulTotal` | total bytes to upload
    `ulNow` | currently uploaded bytes

    Connection type used when the URL should be used to auto detect the protocol. This struct is used as placeholder for the connection parameter when calling the high level API and the connection type (HTTP/FTP) should be guessed by inspecting the URL parameter. The rules for guessing the protocol are: 1, if URL starts with ftp://, ftps:// or ftp. then FTP connection is assumed. 2, HTTP connection otherwise.

    Callback returns Return 0 from the `callback` to signal success, return non-zero to abort transfer.

  void `clearCommands`();
    Clear all commands send to ftp server.
  void `addCommand`(const(char)[] `command`);
    Add a `command` to send to ftp server.
    There is no remove `command` functionality. Do a clearCommands and set the needed commands instead.

    Example

        import std.net.curl;
        auto client = FTP();
        client.addCommand("RNFR my_file.txt");
        client.addCommand("RNTO my_renamed_file.txt");
        upload("my_file.txt", "ftp.digitalmars.com", client);

  @property void `encoding`(string `name`);
  @property string `encoding`();
    Connection `encoding`. Defaults to ISO-8859-1.
  @property void `contentLength`(ulong `len`);
    The content length in bytes of the ftp data.
  CurlCode `getTiming`(CurlInfo `timing`, ref double `val`);
    Get various timings defined in etc.c.curl.CurlInfo. The value is usable only if the return value is equal to etc.c.curl.CurlError.ok.
    Parameters:

    CurlInfo `timing` | one of the timings defined in etc.c.curl.CurlInfo. The values are: etc.c.curl.CurlInfo.namelookup_time, etc.c.curl.CurlInfo.connect_time, etc.c.curl.CurlInfo.pretransfer_time, etc.c.curl.CurlInfo.starttransfer_time, etc.c.curl.CurlInfo.redirect_time, etc.c.curl.CurlInfo.appconnect_time, etc.c.curl.CurlInfo.total_time.
    double `val` | the actual value of the inquired `timing`.

    Returns:
    The return code of the operation. The value stored in `val` should be used only if the return value is etc.c.curl.CurlInfo.ok.

    Example

        import std.net.curl;
        import etc.c.curl : CurlError, CurlInfo;

        auto client = FTP();
        client.addCommand("RNFR my_file.txt");
        client.addCommand("RNTO my_renamed_file.txt");
        upload("my_file.txt", "ftp.digitalmars.com", client);

        double val;
        CurlCode code;

        code = client.getTiming(CurlInfo.namelookup_time, val);
        assert(code == CurlError.ok);

struct `SMTP`;
  Basic `SMTP` protocol support.

  Example

      import std.net.curl;

      // Send an email with SMTPS
      auto smtp = SMTP("smtps://smtp.gmail.com");
      smtp.setAuthentication("from.addr@gmail.com", "password");
      smtp.mailTo = ["<to.addr@gmail.com>"];
      smtp.mailFrom = "<from.addr@gmail.com>";
      smtp.message = "Example Message";
      smtp.perform();

  See Also:
  RFC2821
  static SMTP `opCall`(const(char)[] `url`);
    Sets to the URL of the SMTP server.
  static SMTP `opCall`();
  CurlCode `perform`(ThrowOnError `throwOnError` = Yes.`throwOnError`);
    Performs the request as configured.
    Parameters:

    ThrowOnError `throwOnError` | whether to throw an exception or return a CurlCode on error

  @property void `url`(const(char)[] `url`);
    The URL to specify the location of the resource.
  alias `requestPause` = etc.c.curl.CurlReadFunc.pause;
    Value to return from onSend/onReceive delegates in order to pause a request
  alias `requestAbort` = etc.c.curl.CurlReadFunc.abort;
    Value to return from onSend delegate in order to abort a request
  @property bool `isStopped`();
    True if the instance is stopped. A stopped instance is not usable.
  void `shutdown`();
    Stop and invalidate this instance.
  @property void `verbose`(bool `on`);
    Set `verbose`. This will print request information to stderr.
  @property void `dataTimeout`(Duration `d`);
    Set timeout for activity on connection.
  @property void `operationTimeout`(Duration `d`);
    Set maximum time an operation is allowed to take. This includes dns resolution, connecting, data transfer, etc.
  @property void `connectTimeout`(Duration `d`);
    Set timeout for connecting.
  @property void `proxy`(const(char)[] `host`);
    Proxy

    See proxy

  @property void `proxyPort`(ushort `port`);
    Proxy `port`

    See proxy_port

  alias `CurlProxy` = etc.c.curl.`CurlProxy`;
    Type of proxy
  @property void `proxyType`(CurlProxy `type`);
    Proxy `type`

    See proxy_type

  @property void `dnsTimeout`(Duration `d`);
    DNS lookup timeout.
  @property void `netInterface`(const(char)[] `i`);
  @property void `netInterface`(const(ubyte)[4] `i`);
  @property void `netInterface`(InternetAddress `i`);
    The network interface to use in form of the the IP of the interface.

    Example

        theprotocol.netInterface = "192.168.1.32";
        theprotocol.netInterface = [ 192, 168, 1, 32 ];

    See std.socket.InternetAddress

  @property void `localPort`(ushort `port`);
    Set the local outgoing `port` to use.
    Parameters:

    ushort `port` | the first outgoing `port` number to try and use

  @property void `localPortRange`(ushort `range`);
    Set the local outgoing port `range` to use. This can be used together with the localPort property.
    Parameters:

    ushort `range` | if the first port is occupied then try this many port number forwards

  @property void `tcpNoDelay`(bool `on`);
    Set the tcp no-delay socket option `on` or off.

    See nodelay

  void `setAuthentication`(const(char)[] `username`, const(char)[] `password`, const(char)[] `domain` = "");
    Set the user name, `password` and optionally `domain` for authentication purposes.
    Some protocols may need authentication in some cases. Use this function to provide credentials.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`
    const(char)[] `domain` | used for NTLM authentication only and is set to the NTLM `domain` name

  void `setProxyAuthentication`(const(char)[] `username`, const(char)[] `password`);
    Set the user name and `password` for proxy authentication.
    Parameters:

    const(char)[] `username` | the `username`
    const(char)[] `password` | the `password`

  @property void `onSend`(size_t delegate(void[]) `callback`);
    The event handler that gets called when data is needed for sending. The length of the void[] specifies the maximum number of bytes that can be sent.
    Returns:
    The `callback` returns the number of elements in the buffer that have been filled and are ready to send. The special value .abortRequest can be returned in order to abort the current request. The special value .pauseRequest can be returned in order to pause the current request.
  @property void `onReceive`(size_t delegate(ubyte[]) `callback`);
    The event handler that receives incoming data. Be sure to copy the incoming ubyte[] since it is not guaranteed to be valid after the `callback` returns.
    Returns:
    The `callback` returns the incoming bytes read. If not the entire array is the request will abort. The special value .pauseRequest can be returned in order to pause the current request.
  @property void `onProgress`(int delegate(size_t dlTotal, size_t dlNow, size_t ulTotal, size_t ulNow) `callback`);
    The event handler that gets called to inform of upload/download progress.

    Callback parameters

    `dlTotal` | total bytes to download
    `dlNow` | currently downloaded bytes
    `ulTotal` | total bytes to upload
    `ulNow` | currently uploaded bytes

    Connection type used when the URL should be used to auto detect the protocol. This struct is used as placeholder for the connection parameter when calling the high level API and the connection type (HTTP/FTP) should be guessed by inspecting the URL parameter. The rules for guessing the protocol are: 1, if URL starts with ftp://, ftps:// or ftp. then FTP connection is assumed. 2, HTTP connection otherwise.

    Callback returns Return 0 from the `callback` to signal success, return non-zero to abort transfer.

  @property void `mailFrom`()(const(char)[] `sender`);
    Setter for the `sender`'s email address.
  void `mailTo`()(const(char)[][] `recipients`...);
    Setter for the recipient email addresses.
  @property void `message`(string `msg`);
    Sets the `message` body text.
class `CurlException`: object.Exception;
  Exception thrown on errors in std.net.curl functions.
  pure nothrow @safe this(string `msg`, string `file` = __FILE__, size_t `line` = __LINE__, Throwable `next` = null);
    Parameters:

    string `msg` | The message for the exception.
    string `file` | The `file` where the exception occurred.
    size_t `line` | The `line` number where the exception occurred.
    Throwable `next` | The previous exception in the chain of exceptions, if any.

class `CurlTimeoutException`: std.net.curl.CurlException;
  Exception thrown on timeout errors in std.net.curl functions.
  pure nothrow @safe this(string `msg`, string `file` = __FILE__, size_t `line` = __LINE__, Throwable `next` = null);
    Parameters:

    string `msg` | The message for the exception.
    string `file` | The `file` where the exception occurred.
    size_t `line` | The `line` number where the exception occurred.
    Throwable `next` | The previous exception in the chain of exceptions, if any.

class `HTTPStatusException`: std.net.curl.CurlException;
  Exception thrown on HTTP request failures, e.g. 404 Not Found.
  pure nothrow @safe this(int `status`, string `msg`, string `file` = __FILE__, size_t `line` = __LINE__, Throwable `next` = null);
    Parameters:

    int `status` | The HTTP `status` code.
    string `msg` | The message for the exception.
    string `file` | The `file` where the exception occurred.
    size_t `line` | The `line` number where the exception occurred.
    Throwable `next` | The previous exception in the chain of exceptions, if any.

  immutable int `status`;
    The HTTP `status` code
alias `CurlCode` = int;
  Equal to etc.c.curl.CURLcode
alias `ThrowOnError` = std.typecons.Flag!"throwOnError".Flag;
  Flag to specify whether or not an exception is thrown on error.
struct `Curl`;
  Wrapper to provide a better interface to libcurl than using the plain C API. It is recommended to use the HTTP/FTP etc. structs instead unless raw access to libcurl is needed.

  Warning This struct uses interior pointers for callbacks. Only allocate it on the stack if you never move or copy it. This also means passing by reference when passing `Curl` to other functions. Otherwise always allocate on the heap.

  void `initialize`();
    Initialize the instance by creating a working curl handle.
  const @property bool `stopped`();
  Curl `dup`();
    Duplicate this handle.
    The new handle will have all options set as the one it was duplicated from. An exception to this is that all options that cannot be shared across threads are reset thereby making it safe to use the duplicate in a new thread.
  void `shutdown`();
    Stop and invalidate this curl instance.

    Warning Do not call this from inside a callback handler e.g. onReceive.

  void `pause`(bool `sendingPaused`, bool `receivingPaused`);
    Pausing and continuing transfers.
  void `set`(CurlOption `option`, const(char)[] `value`);
    Set a string curl `option`.
    Parameters:

    CurlOption `option` | A etc.c.curl.CurlOption as found in the curl documentation
    const(char)[] `value` | The string

  void `set`(CurlOption `option`, long `value`);
    Set a long curl `option`.
    Parameters:

    CurlOption `option` | A etc.c.curl.CurlOption as found in the curl documentation
    long `value` | The long

  void `set`(CurlOption `option`, void* `value`);
    Set a void* curl `option`.
    Parameters:

    CurlOption `option` | A etc.c.curl.CurlOption as found in the curl documentation
    void* `value` | The pointer

  void `clear`(CurlOption `option`);
    Clear a pointer `option`.
    Parameters:

    CurlOption `option` | A etc.c.curl.CurlOption as found in the curl documentation

  void `clearIfSupported`(CurlOption `option`);
    Clear a pointer `option`. Does not raise an exception if the underlying libcurl does not support the `option`. Use sparingly.
    Parameters:

    CurlOption `option` | A etc.c.curl.CurlOption as found in the curl documentation

  CurlCode `perform`(ThrowOnError `throwOnError` = Yes.`throwOnError`);
    `perform` the curl request by doing the HTTP,FTP etc. as it has been setup beforehand.
    Parameters:

    ThrowOnError `throwOnError` | whether to throw an exception or return a CurlCode on error

  CurlCode `getTiming`(CurlInfo `timing`, ref double `val`);
    Get the various timings like name lookup time, total time, connect time etc. The timed category is passed through the `timing` parameter while the `timing` value is stored at `val`. The value is usable only if res is equal to etc.c.curl.CurlError.ok.
  @property void `onReceive`(size_t delegate(InData) `callback`);
    The event handler that receives incoming data.
    Parameters:

    size_t delegate(InData) `callback` | the `callback` that receives the ubyte[] data. Be sure to copy the incoming data and not store a slice.

    Returns:
    The `callback` returns the incoming bytes read. If not the entire array is the request will abort. The special value HTTP.pauseRequest can be returned in order to pause the current request.

    Example

        import std.net.curl, std.stdio;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");
        curl.onReceive = (ubyte[] data) { writeln("Got data", to!(const(char)[])(data)); return data.length;};
        curl.perform();

  @property void `onReceiveHeader`(void delegate(in char[]) `callback`);
    The event handler that receives incoming headers for protocols that uses headers.
    Parameters:

    void delegate(in char[]) `callback` | the `callback` that receives the header string. Make sure the `callback` copies the incoming params if it needs to store it because they are references into the backend and may very likely change.

    Example

        import std.net.curl, std.stdio;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");
        curl.onReceiveHeader = (in char[] header) { writeln(header); };
        curl.perform();

  @property void `onSend`(size_t delegate(OutData) `callback`);
    The event handler that gets called when data is needed for sending.
    Parameters:

    size_t delegate(OutData) `callback` | the `callback` that has a void[] buffer to be filled

    Returns:
    The `callback` returns the number of elements in the buffer that have been filled and are ready to send. The special value Curl.abortRequest can be returned in order to abort the current request. The special value Curl.pauseRequest can be returned in order to pause the current request.

    Example

        import std.net.curl;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");

        string msg = "Hello world";
        curl.onSend = (void[] data)
        {
            auto m = cast(void[]) msg;
            size_t length = m.length > data.length ? data.length : m.length;
            if (length == 0) return 0;
            data[0 .. length] = m[0 .. length];
            msg = msg[length..$];
            return length;
        };
        curl.perform();

  @property void `onSeek`(CurlSeek delegate(long, CurlSeekPos) `callback`);
    The event handler that gets called when the curl backend needs to seek the data to be sent.
    Parameters:

    CurlSeek delegate(long, CurlSeekPos) `callback` | the `callback` that receives a seek offset and a seek position etc.c.curl.CurlSeekPos

    Returns:
    The `callback` returns the success state of the seeking etc.c.curl.CurlSeek

    Example

        import std.net.curl;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");
        curl.onSeek = (long p, CurlSeekPos sp)
        {
            return CurlSeek.cantseek;
        };
        curl.perform();

  @property void `onSocketOption`(int delegate(curl_socket_t, CurlSockType) `callback`);
    The event handler that gets called when the net socket has been created but a connect() call has not yet been done. This makes it possible to set misc. socket options.
    Parameters:

    int delegate(curl_socket_t, CurlSockType) `callback` | the `callback` that receives the socket and socket type etc.c.curl.CurlSockType

    Returns:
    Return 0 from the `callback` to signal success, return 1 to signal error and make curl close the socket

    Example

        import std.net.curl;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");
        curl.onSocketOption = delegate int(curl_socket_t s, CurlSockType t) { /+ do stuff +/ };
        curl.perform();

  @property void `onProgress`(int delegate(size_t dlTotal, size_t dlNow, size_t ulTotal, size_t ulNow) `callback`);
    The event handler that gets called to inform of upload/download progress.
    Parameters:

    int delegate(size_t dlTotal, size_t dlNow, size_t ulTotal, size_t ulNow) `callback` | the `callback` that receives the (total bytes to download, currently downloaded bytes, total bytes to upload, currently uploaded bytes).

    Returns:
    Return 0 from the `callback` to signal success, return non-zero to abort transfer

    Example

        import std.net.curl;
        Curl curl;
        curl.initialize();
        curl.set(CurlOption.url, "http://dlang.org");
        curl.onProgress = delegate int(size_t dltotal, size_t dlnow, size_t ultotal, size_t uln)
        {
            writeln("Progress: downloaded bytes ", dlnow, " of ", dltotal);
            writeln("Progress: uploaded bytes ", ulnow, " of ", ultotal);
            curl.perform();
        };

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