CURLOPT_COPYPOSTFIELDS(3)  Library Functions Manual  CURLOPT_COPYPOSTFIELDS(3)

NAME
       CURLOPT_COPYPOSTFIELDS - have libcurl copy data to POST

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_COPYPOSTFIELDS, char *data);

DESCRIPTION
       Pass a char pointer as parameter, which should be the full data to post
       in a HTTP POST operation. It behaves as the CURLOPT_POSTFIELDS(3)
       option, but the original data is instead copied by the library,
       allowing the application to overwrite the original data after setting
       this option.

       Because data are copied, care must be taken when using this option in
       conjunction with CURLOPT_POSTFIELDSIZE(3) or
       CURLOPT_POSTFIELDSIZE_LARGE(3): If the size has not been set prior to
       CURLOPT_COPYPOSTFIELDS(3), the data is assumed to be a null-terminated
       string; else the stored size informs the library about the byte count
       to copy. In any case, the size must not be changed after
       CURLOPT_COPYPOSTFIELDS(3), unless another CURLOPT_POSTFIELDS(3) or
       CURLOPT_COPYPOSTFIELDS(3) option is issued.

DEFAULT
       NULL

PROTOCOLS
       HTTP

EXAMPLE
       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           char local_buffer[1024]="data to send";
           curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

           /* size of the data to copy from the buffer and send in the request */
           curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, 12L);

           /* send data from the local stack */
           curl_easy_setopt(curl, CURLOPT_COPYPOSTFIELDS, local_buffer);

           curl_easy_perform(curl);
         }
       }

AVAILABILITY
       Added in 7.17.1

RETURN VALUE
       Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if
       not, or CURLE_OUT_OF_MEMORY if there was insufficient heap space.

SEE ALSO
       CURLOPT_MIMEPOST(3), CURLOPT_POSTFIELDS(3), CURLOPT_POSTFIELDSIZE(3),
       CURLOPT_UPLOAD(3)

libcurl                          April 26 2024       CURLOPT_COPYPOSTFIELDS(3)