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CURLINFO_CONTENT_LENGTH_DOWNLOAD(3)                                    libcurl

NAME
       CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download

SYNOPSIS
       #include <curl/curl.h>

       CURLcode curl_easy_getinfo(CURL *handle, CURLINFO_CONTENT_LENGTH_DOWNLOAD,
                                  double *content_length);

DESCRIPTION
       Pass a pointer to a double to receive the content-length of the
       download. This is the value read from the Content-Length: field. Since
       7.19.4, this returns -1 if the size is not known.

       CURLINFO_CONTENT_LENGTH_DOWNLOAD_T(3) is a newer replacement that
       returns a more sensible variable type.

PROTOCOLS
       HTTP(S)

EXAMPLE
       CURL *curl = curl_easy_init();
       if(curl) {
         curl_easy_setopt(curl, CURLOPT_URL, "https://example.com");

         /* Perform the request */
         res = curl_easy_perform(curl);

         if(!res) {
           /* check the size */
           double cl;
           res = curl_easy_getinfo(curl, CURLINFO_CONTENT_LENGTH_DOWNLOAD, &cl);
           if(!res) {
             printf("Size: %.0f\n", cl);
           }
         }
       }

AVAILABILITY
       Added in 7.6.1. Deprecated since 7.55.0.

RETURN VALUE
       Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION
       if not.

SEE ALSO
       curl_easy_getinfo(3), curl_easy_setopt(3),
       CURLINFO_CONTENT_LENGTH_UPLOAD(3),

libcurl 8.1.2                   April 26, 2023
                                           CURLINFO_CONTENT_LENGTH_DOWNLOAD(3)