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CURLOPT_POSTFIELDSIZE(3)

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CURLOPT_POSTFIELDSIZE(3)   Library Functions Manual   CURLOPT_POSTFIELDSIZE(3)

NAME
       CURLOPT_POSTFIELDSIZE - size of POST data pointed to

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDSIZE, long size);

DESCRIPTION
       If you want to post static data to the server without having libcurl do
       a  strlen()  to  measure  the data size, this option must be used. When
       this option is used you can post fully binary data, which otherwise  is
       likely to fail. If this size is set to -1, libcurl uses strlen() to get
       the  size  or relies on the CURLOPT_READFUNCTION(3) (if used) to signal
       the end of data.

       If you post more than 2GB, use CURLOPT_POSTFIELDSIZE_LARGE(3).

DEFAULT
       -1

PROTOCOLS
       This functionality affects http, mqtt and rtsp

EXAMPLE
       #include <string.h> /* for strlen */

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           const char *data = "data to send";

           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* size of the POST data */
           curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)strlen(data));

           curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY
       Added in curl 7.2

RETURN VALUE
       curl_easy_setopt(3) returns a CURLcode indicating success or error.

       CURLE_OK (0) means everything was OK, non-zero means an error occurred,
       see libcurl-errors(3).


ATTRIBUTES
       See attributes(7) for descriptions of the following attributes:

       box; cbp-1 | cbp-1 l | l .  ATTRIBUTE TYPE ATTRIBUTE VALUE = Availabil‐
       ity   web/curl = Stability Uncommitted

SEE ALSO
       CURLOPT_POSTFIELDS(3), CURLOPT_POSTFIELDSIZE_LARGE(3)



NOTES
       Source code for open source software components in Oracle  Solaris  can
       be found at https://www.oracle.com/downloads/opensource/solaris-source-
       code-downloads.html.

       This software was built from source available at:
       https://github.com/oracle/solaris-userland

       The original community source was downloaded from:
       https://curl.se/download/curl-8.17.0.tar.bz2

       Further information about this software can be found on the open source
       community website at http://curl.haxx.se/.

libcurl                           2025-12-01          CURLOPT_POSTFIELDSIZE(3)
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