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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 applica- tion to overwrite the original data after setting this option. Because data is copied, care must be taken when using this option in con- junction 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_POST- FIELDS(3) or CURLOPT_COPYPOSTFIELDS(3) option is set. The application does not have to keep the string around after setting this option. Using this option multiple times makes the last set string override the previous ones. Set it to NULL to disable its use again. DEFAULT NULL PROTOCOLS This functionality affects http, mqtt and rtsp EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode result; 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); result = curl_easy_perform(curl); curl_easy_cleanup(curl); } } AVAILABILITY Added in curl 7.17.1 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_MIMEPOST(3), CURLOPT_POSTFIELDS(3), CURLOPT_POSTFIELDSIZE(3), CUR- LOPT_UPLOAD(3) libcurl 2026-07-30 CURLOPT_COPYPOSTFIELDS(3)
NAME | SYNOPSIS | DESCRIPTION | DEFAULT | PROTOCOLS | EXAMPLE | AVAILABILITY | RETURN VALUE | SEE ALSO
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