CURLOPT_POSTFIELDS(3)      curl_easy_setopt options      CURLOPT_POSTFIELDS(3)

NAME
       CURLOPT_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).

       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.

       Using CURLOPT_POSTFIELDS(3) implies CURLOPT_POST(3).

       If CURLOPT_POSTFIELDS(3) is explicitly set to NULL  then  libcurl  will
       get  the  POST data from the read callback. If you want to send a zero-
       byte POST set CURLOPT_POSTFIELDS(3) to an empty  string,  or  set  CUR-
       LOPT_POST(3) to 1 and CURLOPT_POSTFIELDSIZE(3) to 0.

       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 ALSO
       CURLOPT_POSTFIELDSIZE(3), CURLOPT_READFUNCTION(3),

libcurl 7.54.0                   June 11, 2016           CURLOPT_POSTFIELDS(3)