CURLOPT_POSTFIELDSIZE

Section: curl_easy_setopt options (3)
Updated: November 04, 2020
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NAME

CURLOPT_POSTFIELDSIZE - size of POST data pointed to

SYNOPSIS

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

DESCRIPTION

If you want to post 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, the library will use strlen() to get the size.

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

DEFAULT

-1

PROTOCOLS

HTTP

EXAMPLE

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

Along with HTTP

RETURN VALUE

Returns CURLE_OK if HTTP is supported, and CURLE_UNKNOWN_OPTION if not.