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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:
  $(HTTP www.ietf.org/rfc/rfc2616.txt, 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.
  @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.
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.

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

  @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();
        };

Copyright Jonas Drewsen 2011-2012 | Page generated by Ddoc on Sat Oct 1 19:44:07 2016