CURLOPT_COPYPOSTFIELDS(3)  curl_easy_setopt options  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 * as parameter, which should be the full data to post in a
       HTTP POST operation. It behaves as the _POSTFIELDS&section=3">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 _POSTFIELDSIZE&section=3">CURLOPT_POSTFIELDSIZE(3) or
       _POSTFIELDSIZE_LARGE&section=3">CURLOPT_POSTFIELDSIZE_LARGE(3): If the size has not been set prior to
       _COPYPOSTFIELDS&section=3">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
       _COPYPOSTFIELDS&section=3">CURLOPT_COPYPOSTFIELDS(3), unless another _POSTFIELDS&section=3">CURLOPT_POSTFIELDS(3) or
       _COPYPOSTFIELDS&section=3">CURLOPT_COPYPOSTFIELDS(3) option is issued.

DEFAULT
       NULL

PROTOCOLS
       HTTP(S)

EXAMPLE
       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_POSTFIELDS(3), CURLOPT_POSTFIELDSIZE(3),

libcurl 7.77.0                 November 4, 2020      CURLOPT_COPYPOSTFIELDS(3)