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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 op- tion 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) { CURLcode result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(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). SEE ALSO CURLOPT_POSTFIELDS(3), CURLOPT_POSTFIELDSIZE_LARGE(3) libcurl 2026-06-11 CURLOPT_POSTFIELDSIZE(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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