CURLOPT_TRAILERDATA(3) - Man pages

CURLOPT_TRAILERDATA(3)      Library Functions Manual     CURLOPT_TRAILERDATA(3)

NAME
       CURLOPT_TRAILERDATA - pointer passed to trailing headers callback

SYNOPSIS
       #include <curl.h>

       CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERDATA, void *userdata);

DESCRIPTION
       Data pointer to be passed to the HTTP trailer callback function.

DEFAULT
       NULL

PROTOCOLS
       This functionality affects http only

EXAMPLE
       struct MyData {
         void *custom;
       };

       int main(void)
       {
         CURL *curl = curl_easy_init();
         if(curl) {
           struct MyData data;
           curl_easy_setopt(curl, CURLOPT_TRAILERDATA, &data);
         }
       }

AVAILABILITY
       Added in curl 7.64.0

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_TRAILERFUNCTION(3), CURLOPT_WRITEFUNCTION(3)

libcurl                            2026-07-12            CURLOPT_TRAILERDATA(3)

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