1--- 2c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al. 3SPDX-License-Identifier: curl 4Title: CURLOPT_POSTFIELDSIZE 5Section: 3 6Source: libcurl 7See-also: 8 - CURLOPT_POSTFIELDS (3) 9 - CURLOPT_POSTFIELDSIZE_LARGE (3) 10Protocol: 11 - HTTP 12--- 13 14# NAME 15 16CURLOPT_POSTFIELDSIZE - size of POST data pointed to 17 18# SYNOPSIS 19 20~~~c 21#include <curl/curl.h> 22 23CURLcode curl_easy_setopt(CURL *handle, CURLOPT_POSTFIELDSIZE, long size); 24~~~ 25 26# DESCRIPTION 27 28If you want to post static data to the server without having libcurl do a 29strlen() to measure the data size, this option must be used. When this option 30is used you can post fully binary data, which otherwise is likely to fail. If 31this size is set to -1, libcurl uses strlen() to get the size or relies on the 32CURLOPT_READFUNCTION(3) (if used) to signal the end of data. 33 34If you post more than 2GB, use CURLOPT_POSTFIELDSIZE_LARGE(3). 35 36# DEFAULT 37 38-1 39 40# EXAMPLE 41 42~~~c 43#include <string.h> /* for strlen */ 44 45int main(void) 46{ 47 CURL *curl = curl_easy_init(); 48 if(curl) { 49 const char *data = "data to send"; 50 51 curl_easy_setopt(curl, CURLOPT_URL, "https://example.com"); 52 53 /* size of the POST data */ 54 curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long) strlen(data)); 55 56 curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data); 57 58 curl_easy_perform(curl); 59 } 60} 61~~~ 62 63# AVAILABILITY 64 65Along with HTTP 66 67# RETURN VALUE 68 69Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not. 70