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https://github.com/moparisthebest/curl
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f77dfbc5fb
When CURLOPT_POSTFIELDS is set to an empty string libcurl will send a zero-byte POST. Prior to this change it was documented as sending data from the read callback. This also changes the wording of what happens when empty or NULL so that it's hopefully easier to understand for people whose primary language isn't English. Bug: https://github.com/curl/curl/issues/862 Reported-by: Askar Safin
87 lines
3.5 KiB
Groff
87 lines
3.5 KiB
Groff
.\" **************************************************************************
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.\" * _ _ ____ _
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.\" * Project ___| | | | _ \| |
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.\" * / __| | | | |_) | |
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.\" * | (__| |_| | _ <| |___
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.\" * \___|\___/|_| \_\_____|
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.\" *
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.\" * Copyright (C) 1998 - 2014, Daniel Stenberg, <daniel@haxx.se>, et al.
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.\" *
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.\" * This software is licensed as described in the file COPYING, which
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.\" * you should have received as part of this distribution. The terms
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.\" * are also available at https://curl.haxx.se/docs/copyright.html.
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.\" *
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.\" * You may opt to use, copy, modify, merge, publish, distribute and/or sell
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.\" * copies of the Software, and permit persons to whom the Software is
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.\" * furnished to do so, under the terms of the COPYING file.
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.\" *
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.\" * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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.\" * KIND, either express or implied.
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.\" *
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.\" **************************************************************************
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.\"
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.TH CURLOPT_POSTFIELDS 3 "17 Jun 2014" "libcurl 7.37.0" "curl_easy_setopt options"
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.SH NAME
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CURLOPT_POSTFIELDS \- specify data to POST to server
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.SH SYNOPSIS
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#include <curl/curl.h>
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CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDS, char *postdata);
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.SH DESCRIPTION
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Pass a char * as parameter, pointing to the full data to send in a HTTP POST
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operation. You must make sure that the data is formatted the way you want the
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server to receive it. libcurl will not convert or encode it for you in any
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way. For example, the web server may assume that this data is url-encoded.
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The data pointed to is NOT copied by the library: as a consequence, it must be
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preserved by the calling application until the associated transfer finishes.
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This behaviour can be changed (so libcurl does copy the data) by setting the
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\fICURLOPT_COPYPOSTFIELDS(3)\fP option.
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This POST is a normal application/x-www-form-urlencoded kind (and libcurl will
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set that Content-Type by default when this option is used), which is commonly
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used by HTML forms. Change Content-Type with \fICURLOPT_HTTPHEADER(3)\fP.
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You can use \fIcurl_easy_escape(3)\fP to url-encode your data, if necessary. It
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returns a pointer to an encoded string that can be passed as \fIpostdata\fP.
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Using \fICURLOPT_POSTFIELDS(3)\fP implies \fICURLOPT_POST(3)\fP.
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If \fICURLOPT_POSTFIELDS(3)\fP is explicitly set to NULL then libcurl will get
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the POST data from the read callback. If you want to send a zero-byte POST set
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\fICURLOPT_POSTFIELDS(3)\fP to an empty string, or set \fICURLOPT_POST(3)\fP to
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1 and \fICURLOPT_POSTFIELDSIZE(3)\fP to 0.
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Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
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You can disable this header with \fICURLOPT_HTTPHEADER(3)\fP as usual.
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To make multipart/formdata posts (aka RFC2388-posts), check out the
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\fICURLOPT_HTTPPOST(3)\fP option combined with \fIcurl_formadd(3)\fP.
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.SH DEFAULT
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NULL
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.SH PROTOCOLS
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HTTP
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.SH EXAMPLE
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.nf
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CURL *curl = curl_easy_init();
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if(curl) {
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const char *data = "data to send";
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curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
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/* size of the POST data */
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 12L);
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/* pass in a pointer to the data - libcurl will not copy */
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
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curl_easy_perform(curl);
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}
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.fi
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.SH AVAILABILITY
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Always
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.SH RETURN VALUE
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Returns CURLE_OK
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.SH "SEE ALSO"
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.BR CURLOPT_POSTFIELDSIZE "(3), " CURLOPT_READFUNCTION "(3), "
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