CURLINFO_CONTENT_LENGTH_DOWNLOAD(3) Library Functions Manual NAME CURLINFO_CONTENT_LENGTH_DOWNLOAD - get content-length of download SYNOPSIS #include 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 This functionality affects all supported protocols EXAMPLE int main(void) { CURL *curl = curl_easy_init(); if(curl) { CURLcode res; 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); } } } } DEPRECATED Deprecated since 7.55.0. AVAILABILITY Added in curl 7.6.1 RETURN VALUE Returns CURLE_OK if the option is supported, and CURLE_UNKNOWN_OPTION if not. SEE ALSO CURLINFO_CONTENT_LENGTH_UPLOAD(3), curl_easy_getinfo(3), curl_easy_setopt(3) libcurl 2024-11-07 CURLINFO_CONTENT_LENGTH_DOWNLOAD(3)