103 lines
2.9 KiB
Markdown
103 lines
2.9 KiB
Markdown
|
---
|
||
|
|
c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
|
||
|
|
SPDX-License-Identifier: curl
|
||
|
|
Title: CURLOPT_POST
|
||
|
|
Section: 3
|
||
|
|
Source: libcurl
|
||
|
|
See-also:
|
||
|
|
- CURLOPT_HTTPPOST (3)
|
||
|
|
- CURLOPT_POSTFIELDS (3)
|
||
|
|
- CURLOPT_PUT (3)
|
||
|
|
---
|
||
|
|
|
||
|
|
# NAME
|
||
|
|
|
||
|
|
CURLOPT_POST - make an HTTP POST
|
||
|
|
|
||
|
|
# SYNOPSIS
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
#include <curl/curl.h>
|
||
|
|
|
||
|
|
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POST, long post);
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# DESCRIPTION
|
||
|
|
|
||
|
|
A parameter set to 1 tells libcurl to do a regular HTTP post. This also makes
|
||
|
|
libcurl use a "Content-Type: application/x-www-form-urlencoded" header. This
|
||
|
|
is the most commonly used POST method.
|
||
|
|
|
||
|
|
Use one of CURLOPT_POSTFIELDS(3) or CURLOPT_COPYPOSTFIELDS(3)
|
||
|
|
options to specify what data to post and CURLOPT_POSTFIELDSIZE(3) or
|
||
|
|
CURLOPT_POSTFIELDSIZE_LARGE(3) to set the data size.
|
||
|
|
|
||
|
|
Optionally, you can provide data to POST using the
|
||
|
|
CURLOPT_READFUNCTION(3) and CURLOPT_READDATA(3) options but then
|
||
|
|
you must make sure to not set CURLOPT_POSTFIELDS(3) to anything but
|
||
|
|
NULL. When providing data with a callback, you must transmit it using chunked
|
||
|
|
transfer-encoding or you must set the size of the data with the
|
||
|
|
CURLOPT_POSTFIELDSIZE(3) or CURLOPT_POSTFIELDSIZE_LARGE(3)
|
||
|
|
options. To enable chunked encoding, you simply pass in the appropriate
|
||
|
|
Transfer-Encoding header, see the post-callback.c example.
|
||
|
|
|
||
|
|
You can override the default POST Content-Type: header by setting your own
|
||
|
|
with CURLOPT_HTTPHEADER(3).
|
||
|
|
|
||
|
|
Using POST with HTTP 1.1 implies the use of a "Expect: 100-continue" header.
|
||
|
|
You can disable this header with CURLOPT_HTTPHEADER(3) as usual.
|
||
|
|
|
||
|
|
If you use POST to an HTTP 1.1 server, you can send data without knowing the
|
||
|
|
size before starting the POST if you use chunked encoding. You enable this by
|
||
|
|
adding a header like "Transfer-Encoding: chunked" with
|
||
|
|
CURLOPT_HTTPHEADER(3). With HTTP 1.0 or without chunked transfer, you
|
||
|
|
must specify the size in the request. (Since 7.66.0, libcurl automatically
|
||
|
|
uses chunked encoding for POSTs if the size is unknown.)
|
||
|
|
|
||
|
|
When setting CURLOPT_POST(3) to 1, libcurl automatically sets
|
||
|
|
CURLOPT_NOBODY(3) and CURLOPT_HTTPGET(3) to 0.
|
||
|
|
|
||
|
|
If you issue a POST request and then want to make a HEAD or GET using the same
|
||
|
|
reused handle, you must explicitly set the new request type using
|
||
|
|
CURLOPT_NOBODY(3) or CURLOPT_HTTPGET(3) or similar.
|
||
|
|
|
||
|
|
When setting CURLOPT_POST(3) to 0, libcurl resets the request type to the
|
||
|
|
default to disable the POST. Typically that means gets reset to GET. Instead
|
||
|
|
you should set a new request type explicitly as described above.
|
||
|
|
|
||
|
|
# DEFAULT
|
||
|
|
|
||
|
|
0, disabled
|
||
|
|
|
||
|
|
# PROTOCOLS
|
||
|
|
|
||
|
|
HTTP
|
||
|
|
|
||
|
|
# EXAMPLE
|
||
|
|
|
||
|
|
~~~c
|
||
|
|
int main(void)
|
||
|
|
{
|
||
|
|
CURL *curl = curl_easy_init();
|
||
|
|
if(curl) {
|
||
|
|
CURLcode res;
|
||
|
|
curl_easy_setopt(curl, CURLOPT_URL, "https://example.com/foo.bin");
|
||
|
|
curl_easy_setopt(curl, CURLOPT_POST, 1L);
|
||
|
|
|
||
|
|
/* set up the read callback with CURLOPT_READFUNCTION */
|
||
|
|
|
||
|
|
res = curl_easy_perform(curl);
|
||
|
|
|
||
|
|
curl_easy_cleanup(curl);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
~~~
|
||
|
|
|
||
|
|
# AVAILABILITY
|
||
|
|
|
||
|
|
Along with HTTP
|
||
|
|
|
||
|
|
# RETURN VALUE
|
||
|
|
|
||
|
|
Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.
|