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/curl/lib/
H A Dcurl_config.h.cmake757 /* Define to 1 if you do not want the OpenSSL configuration to be loaded
761 /* to enable NGHTTP2 */
764 /* to enable NGTCP2 */
767 /* to enable NGHTTP3 */
770 /* to enable quiche */
779 /* to enable msh3 */
809 /* Define to empty if `const' does not conform to ANSI C. */
824 /* to enable Windows IDN */
827 /* to enable Apple IDN */
836 /* Define to 1 to enable TLS-SRP support. */
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H A Dcurl_range.c40 curl_off_t from, to; in Curl_range() local
52 to_t = curlx_strtoofft(ptr, &ptr2, 10, &to); in Curl_range()
62 data->req.maxdownload = to; in Curl_range()
63 data->state.resume_from = -to; in Curl_range()
64 DEBUGF(infof(data, "RANGE the last %" FMT_OFF_T " bytes", to)); in Curl_range()
71 if(from > to) in Curl_range()
74 totalsize = to - from; in Curl_range()
86 from, to, data->req.maxdownload)); in Curl_range()
/curl/docs/libcurl/opts/
H A DCURLOPT_PIPEWAIT.md31 Set *wait* to 1L to tell libcurl to prefer to wait for a connection to
34 When about to perform a new transfer that allows multiplexing, libcurl checks
35 for existing connections to use. If no such connection exists it immediately
36 continues and creates a fresh new connection to use.
38 By setting this option to 1 - and having CURLMOPT_PIPELINING(3) enabled
40 for the connection to reveal if it is possible to multiplex on before it
41 continues. This enables libcurl to much better keep the number of connections
42 to a minimum when using multiplexing protocols.
45 for multiplexing rather than the opposite: prefer to open a new connection
48 The waiting time is as long as it takes for the connection to get up and for
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H A DCURLOPT_CONNECT_TO.md19 CURLOPT_CONNECT_TO - connect to another host and port instead
32 Pass a pointer to a linked list of strings with "connect to" information to
35 in. Use curl_slist_append(3) to create the list and curl_slist_free_all(3) to
41 connect to, and CONNECT-TO-PORT is the port to connect to.
50 CONNECT-TO-HOST or CONNECT-TO-PORT is empty, the "connect to" feature is
57 The "connect to" host and port are only used to establish the network
63 of other easy handles that have been added to the same multi handle.
65 The "connect to" host and port are ignored if they are equal to the host and
71 port, the HTTP proxy is automatically switched to tunnel mode for this
72 specific request. This is necessary because it is not possible to connect to a
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H A DCURLOPT_UNRESTRICTED_AUTH.md20 CURLOPT_UNRESTRICTED_AUTH - send credentials to other hosts too
33 Set the long *gohead* parameter to 1L to make libcurl continue to send
40 requests done to other hosts than the one used for the initial URL. Another
45 headers to the initial host as given in the original URL, to avoid leaking
46 username + password to other sites.
50 CURLOPT_UNRESTRICTED_AUTH(3) to 1L makes curl trust the server and sends
51 possibly sensitive credentials to any host the server points to, possibly
52 again and again as the following hosts can keep redirecting to new hosts.
54 Due to the way HTTP works, almost any header can be made to contain data a
55 client may not want to pass on to other servers than the initially intended
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H A DCURLOPT_HEADER.md21 CURLOPT_HEADER - pass headers to the data stream
33 Pass the long value *onoff* set to 1 to ask libcurl to include the headers
38 When asking to get the headers passed to the same callback as the body, it is
39 not possible to accurately separate them again without detailed knowledge
42 Further: the CURLOPT_WRITEFUNCTION(3) callback is limited to only ever
43 get a maximum of *CURL_MAX_WRITE_SIZE* bytes passed to it (16KB), while a
45 called with headers up to *CURL_MAX_HTTP_HEADER* bytes big (100KB).
47 It is often better to use CURLOPT_HEADERFUNCTION(3) to get the header
50 While named confusingly similar, CURLOPT_HTTPHEADER(3) is used to set
H A DCURLOPT_NOSIGNAL.md29 any functions that cause signals to be sent to the process. This option is
30 here to allow multi-threaded Unix applications to still set/use all timeout
35 building libcurl with the c-ares or threaded resolver backends to enable
36 asynchronous DNS lookups, to enable timeouts for name resolves without the use
39 Setting CURLOPT_NOSIGNAL(3) to 1 makes libcurl NOT ask the system to
40 ignore SIGPIPE signals, which otherwise are sent by the system when trying to
41 send data to a socket which is closed in the other end. libcurl makes an
42 effort to never cause such SIGPIPE signals to trigger, but some operating
43 systems have no way to avoid them and even on those that have there are some
44 corner cases when they may still happen, contrary to our desire.
H A DCURLOPT_PATH_AS_IS.md31 Set the long *leaveit* to 1, to explicitly tell libcurl to not alter the
32 given path before passing it on to the server.
34 This instructs libcurl to NOT squash sequences of "/../" or "/./" that may
35 exist in the URL's path part and that is supposed to be removed according to
38 Some server implementations are known to (erroneously) require the dot-dot
39 sequences to remain in the path and some clients want to pass these on in
40 order to try out server implementations.
H A DCURLOPT_PRE_PROXY.md17 CURLOPT_PRE_PROXY - pre-proxy host to use
29 Set the *preproxy* to use for the upcoming request. The parameter should be a
30 char * to a null-terminated string holding the hostname or dotted numerical IP
33 To specify port number in this string, append :[port] to the end of the host
35 option CURLOPT_PROXYPORT(3). If not specified, libcurl defaults to using
38 A pre proxy is a SOCKS proxy that curl connects to before it connects to the
44 one to enable socks5 and asking the proxy to do the resolving, also known as
45 *CURLPROXY_SOCKS5_HOSTNAME* type) to request the specific SOCKS version to
51 When you set a hostname to use, do not assume that there is any particular
54 The application does not have to keep the string around after setting this
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H A DCURLOPT_WRITEDATA.md18 CURLOPT_WRITEDATA - pointer passed to the write callback
30 A data *pointer* to pass to the write callback. If you use the
33 must make *pointer* a 'FILE *' (cast to 'void *') as libcurl passes this
34 to *fwrite(3)* when writing data.
36 The internal CURLOPT_WRITEFUNCTION(3) writes the data to the FILE *
37 given with this option, or to stdout if this option has not been set.
51 A common technique is to use the write callback to store the incoming data
53 CURLOPT_WRITEDATA(3) is used to point to a struct or the buffer to store data
H A DCURLOPT_HTTPGET.md31 Pass a long. If *useget* is 1, this forces the HTTP request to get back to
35 When setting CURLOPT_HTTPGET(3) to 1, libcurl automatically sets
36 CURLOPT_NOBODY(3) to 0 and CURLOPT_UPLOAD(3) to 0.
38 Setting this option to zero has no effect. Applications need to explicitly
39 select which HTTP request method to use, they cannot deselect a method. To
40 reset a handle to default method, consider curl_easy_reset(3).
57 /* use a GET to fetch this */
H A DCURLOPT_TIMEOUT.md19 CURLOPT_TIMEOUT - maximum time the transfer is allowed to complete
33 from start to end. Normally, name lookups can take a considerable time and
44 queue the transfer, and that time is included. You are advised to explore
46 CURLOPT_PROGRESSFUNCTION(3) to implement your own timeout logic.
51 With CURLOPT_CONNECTTIMEOUT(3) set to 3 and CURLOPT_TIMEOUT(3) set
52 to 5, the operation can never last longer than 5 seconds.
54 With CURLOPT_CONNECTTIMEOUT(3) set to 4 and CURLOPT_TIMEOUT(3) set
55 to 2, the operation can never last longer than 2 seconds.
57 This option may cause libcurl to use the SIGALRM signal to timeout system
59 signals to be used unless CURLOPT_NOSIGNAL(3) is set.
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H A DCURLOPT_HTTPAUTH.md18 CURLOPT_HTTPAUTH - HTTP server authentication methods to try
30 Pass a long as parameter, which is set to a bitmask, to tell libcurl which
31 authentication method(s) you want it to use speaking to the remote server.
52 is a more secure way to do authentication over public networks than the
61 and that some servers require the client to use.
67 You can set the Bearer token to use with CURLOPT_XOAUTH2_BEARER(3).
75 for this to work.
80 Microsoft. It uses a challenge-response and hash concept similar to Digest, to
84 option to work, or build libcurl on Windows with SSPI support.
100 subject to a race condition. This behavior is subject to change in future
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H A DCURLOPT_POSTFIELDS.md21 CURLOPT_POSTFIELDS - data to POST to server
33 Pass a char pointer as parameter, pointing to the data buffer to use in an
48 You can use curl_easy_escape(3) to URL encode your data, if
49 necessary. It returns a pointer to an encoded string that can be passed as
52 Using CURLOPT_POSTFIELDS(3) implies setting CURLOPT_POST(3) to 1.
56 CURLOPT_POSTFIELDS(3) to an empty string, or set CURLOPT_POST(3) to 1 and
57 CURLOPT_POSTFIELDSIZE(3) to 0.
73 previous ones. Set it to NULL to disable its use again.
89 const char *data = "data to send";
96 /* pass in a pointer to the data - libcurl does not copy */
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H A DCURLOPT_HTTPHEADER.md36 Pass a pointer to a linked list of HTTP headers to pass to the server and/or
41 header list establishes the document-level MIME headers to prepend to the
65 CURLOPT_CUSTOMREQUEST(3) to change the method.
72 ones. Set it to NULL to disable its use again.
80 CURLOPT_HEADEROPT(3) to control the behavior.
101 headers can be set to override libcurl-generated values:
106 It defaults to "1.0" and should normally not be altered.
129 CONNECT request, you should to consider if that proxy is supposed to also get
132 Use CURLOPT_HEADEROPT(3) to make the headers only get sent to where you
133 intend them to get sent.
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/curl/docs/libcurl/
H A Dcurl_mime_data_cb.md45 *part* is the part's to assign contents to.
48 as shown by the above prototype. It may not be set to NULL.
50 *seekfunc* is a pointer to a seek callback function, with a signature as
57 may safely be set to NULL. This function is called upon mime structure
60 *arg* is a user defined argument to callback functions.
63 read data in order to send it to the peer - like if you ask it to upload or
70 it to stop the current transfer.
82 connection to pause. See curl_easy_pause(3) for further details.
84 The seek function gets called by libcurl to rewind input stream data or to
90 *CURL_SEEKFUNC_FAIL* to cause the upload operation to fail or
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H A Dcurl_easy_setopt.md35 curl_easy_setopt(3) is used to tell libcurl how to behave. By setting the
145 Data pointer to pass to the close socket callback. See
193 File to write cookies to. See CURLOPT_COOKIEJAR(3)
316 Data pointer to pass to the wildcard matching callback. See
496 Data pointer to pass to the RTSP interleave callback. See
555 Time to be below the speed to trigger low speed abort. See
675 Port number to connect to. See CURLOPT_PORT(3)
721 Data pointer to pass to the progress meter callback. See
901 **Deprecated option** Protocols to allow redirects to. See
922 Data pointer to pass to resolver start callback. See
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H A Dlibcurl-security.md45 line options. Write them to a protected file and use the -K option to avoid
109 A redirect to a file: URL would cause the libcurl to read (or write) arbitrary
181 Allowing your application to connect to local hosts, be it the same machine
188 Some users might be tempted to filter access to local resources or similar
206 CURLOPT_IPRESOLVE(3) to CURL_IPRESOLVE_V4 can be used to limit resolved
264 applications to disable it, to establish a connection to another host over the
347 to and tells the client to connect to a given IP+PORT.
355 many clients trying to connect to that third party, it could create a
363 to send an FTP PORT command to ask the server to connect to a third party host
367 hard to avoid.
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H A Dlibcurl-tutorial.md209 similar to this:
293 Of course, there are bugs left. We need to know about them to be able to fix
310 uploading to a remote FTP site is similar to uploading data to an HTTP server
327 is the custom pointer we set to point to a struct of ours to pass private data
468 libcurl to post it all to the remote site:
625 curl to go back to a plain GET request if you intend to do one as your next
833 HTTP URL is passed to the HTTP proxy to deliver back to libcurl. This happens
958 the way to go.
1145 The option to enable headers or to run custom FTP commands may be useful to
1193 does not have to exist to enable the parser, so a common way to just enable
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H A Dlibcurl-multi.md18 libcurl-multi - how to use the multi interface
36 and when to ask libcurl to get/send data.
65 you should add the easy handle to the multi handle with
83 to the calling application.
86 invoked to transfer data or do other work. The most convenient way is to use
88 libcurl again. The older API to accomplish the same thing is
90 select() or poll() calls in order to get to know when the transfers in the
112 with curl_multi_add_handle(3) to start another transfer.
117 to clean them up properly.
119 If you want to reuse an easy handle that was added to the multi handle for
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/curl/docs/cmdline-opts/
H A Dftp-port.md24 option makes curl use active mode. curl then commands the server to connect
25 back to the client's specified address and port, while passive mode asks the
26 server to setup an IP address and port for it to connect to. \<address\>
30 e.g. **eth0** to specify which interface's IP address you want to use (Unix only)
33 e.g. **192.168.10.1** to specify the exact IP address
36 e.g. **my.host.domain** to specify the machine
44 Disable the use of PORT with --ftp-pasv. Disable the attempt to use the EPRT
47 You can also append ":[start]-[end]" to the right of the address, to tell
48 curl what TCP port range to use. That means you specify a port range, from a
49 lower to a higher number. A single number works as well, but do note that it
H A Dconnect-to.md4 Long: connect-to
6 Help: Connect to host2 instead of host1
14 - --connect-to example.com:443:example.net:8443 $URL
17 # `--connect-to`
19 For a request intended for the `HOST1:PORT1` pair, connect to `HOST2:PORT2`
20 instead. This option is only used to establish the network connection. It does
28 A hostname specified to this option is compared as a string, so it needs to
32 Example: redirect connects from the example.com hostname to 127.0.0.1
35 curl --connect-to example.com::127.0.0.1: https://example.com/
37 Example: redirect connects from all hostnames to 127.0.0.1 independently of
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H A Dupload-file.md7 Help: Transfer local FILE to destination
25 Upload the specified local file to the remote URL.
28 name to the end of the URL before the operation starts. You must use a
29 trailing slash (/) on the last directory to prove to curl that there is no
31 to use.
37 Use the filename `-` (a single dash) to use stdin instead of a given file.
39 `-` to use stdin in non-blocking mode to allow reading server output while
45 --upload-file + URL pair specifies what to upload and to where. curl also
47 multiple files to a single URL by using the same URL globbing style supported
50 When uploading to an SMTP server: the uploaded data is assumed to be RFC 5322
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H A Dlocation-trusted.md5 Help: As --location, but send secrets to other hosts
19 Instructs curl to like --location follow HTTP redirects, but permits it to
20 send credentials and other secrets along to other hosts than the initial one.
22 This may or may not introduce a security breach if the site redirects you to a
23 site to which you send this sensitive data to. Another host means that one or
26 This option also allows curl to pass long cookies set explicitly with --header.
/curl/tests/data/
H A Dtest205430 Connect to specific host: use the first "connect-to" string that matches
34 …to foo::bar: --connect-to :123::456 --next http://www.example.com:%HTTPPORT/%TESTNUMBER --connect-…

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