CURLOPT_POSTFIELDS(3)

CURLOPT_POSTFIELDS(3)curl_easy_setopt optionCURLOPT_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 *postdata);

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 postdata.

     Using CURLOPT_POSTFIELDS(3) implies CURLOPT_POST(3).

     If CURLOPT_POSTFIELDS(3) is explicitly set to NULL then lib-
     curl  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  CURLOPT_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, and libcurl will add that header automati-
     cally if the POST is either known to  be  larger  than  1024
     bytes  or  if  the expected size is unknown. 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

libcurl 7.58.0     Last change: July 07, 2017                   1

CURLOPT_POSTFIELDS(3)curl_easy_setopt optionCURLOPT_POSTFIELDS(3)

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 7.58.0     Last change: July 07, 2017                   2