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CURLOPT_TRAILERDATA - Custom pointer passed to the trailing headers callback #include <curl.h> CURLcode curl_easy_setopt(CURL *handle, CURLOPT_TRAILERDATA, void *userdata); Data pointer to be passed to the HTTP trailer callback function. NULL HTTP

/* Assuming we have a CURL handle in the hndl variable. */

struct MyData data;

curl_easy_setopt(hndl, CURLOPT_TRAILERDATA, &data);

A more complete example can be found in examples/http_trailers.html This option was added in curl 7.64.0 and is present if HTTP support is enabled CURLOPT_TRAILERFUNCTION "(3), "