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.\" generated by cd2nroff 0.1 from CURLOPT_POSTFIELDSIZE.md
.TH CURLOPT_POSTFIELDSIZE 3 "2025-06-27" libcurl
.SH NAME
CURLOPT_POSTFIELDSIZE \- size of POST data pointed to
.SH SYNOPSIS
.nf
#include <curl/curl.h>

CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDSIZE, long size);
.fi
.SH 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
\fICURLOPT_READFUNCTION(3)\fP (if used) to signal the end of data.

If you post more than 2GB, use \fICURLOPT_POSTFIELDSIZE_LARGE(3)\fP.
.SH DEFAULT
-1
.SH PROTOCOLS
This functionality affects http only
.SH EXAMPLE
.nf
#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);
  }
}
.fi
.SH AVAILABILITY
Added in curl 7.2
.SH RETURN VALUE
\fIcurl_easy_setopt(3)\fP returns a CURLcode indicating success or error.

CURLE_OK (0) means everything was OK, non\-zero means an error occurred, see
\fIlibcurl\-errors(3)\fP.
.SH SEE ALSO
.BR CURLOPT_POSTFIELDS (3),
.BR CURLOPT_POSTFIELDSIZE_LARGE (3)
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