CURLOPT_POSTFIELDS(3) curl_easy_setopt options CURLOPT_POSTFIELDS(3)NAMECURLOPT_POSTFIELDS - specify data to POST to server
SYNOPSIS
#include <curl/curl.h>
CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDS, char *post‐
data);
DESCRIPTION
Pass a char * as parameter, pointing to the full data to send in a HTTP
POST operation. You must make sure that the data is formatted the way
you want the server to receive it. libcurl will not convert or encode
it for you in any way. For example, the web server may assume that this
data is url-encoded.
The data pointed to is NOT copied by the library: as a consequence, it
must be preserved by the calling application until the associated
transfer finishes. This behaviour can be changed (so libcurl does copy
the data) by setting the CURLOPT_COPYPOSTFIELDS(3) option.
This POST is a normal application/x-www-form-urlencoded kind (and
libcurl will set that Content-Type by default when this option is
used), which is commonly used by HTML forms. Change Content-Type with
CURLOPT_HTTPHEADER(3).
Using CURLOPT_POSTFIELDS(3) implies CURLOPT_POST(3).
You can use curl_easy_escape(3) to url-encode your data, if necessary.
It returns a pointer to an encoded string that can be passed as post‐
data.
If you want to do a zero-byte POST, you need to set CURLOPT_POSTFIELD‐
SIZE(3) explicitly to zero, as simply setting CURLOPT_POSTFIELDS(3) to
NULL or "" just effectively disables the sending of the specified
string. libcurl will instead assume that you'll send the POST data
using the read callback!
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.
To make multipart/formdata posts (aka RFC2388-posts), check out the
CURLOPT_HTTPPOST(3) option combined with curl_formadd(3).
DEFAULT
NULL
PROTOCOLS
HTTP
EXAMPLE
CURL *curl = curl_easy_init();
if(curl) {
const char *data = "data to send";
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
/* size of the POST data */
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 12L);
/* pass in a pointer to the data - libcurl will not copy */
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);
curl_easy_perform(curl);
}
AVAILABILITY
Always
RETURN VALUE
Returns CURLE_OK
SEE ALSOCURLOPT_POSTFIELDSIZE(3), CURLOPT_READFUNCTION(3),
libcurl 7.37.0 17 Jun 2014 CURLOPT_POSTFIELDS(3)
