CURL

curl -C - -L -v -O --retry 999 -S 
"http://www.archive.org/download/usgs_drg_nc_35077_b1/o35077b1.tif"

CURL *curl; CURLcode res; struct curl_slist *headers=NULL; // init to NULL is important headers = curl_slist_append(headers, "Accept: application/json"); curl = curl_easy_init(); if(curl) { curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/api/json/123");//cant get json file curl_easy_setopt(curl, CURLOPT_URL, "http://web.com/pages/123.html");//this returns entire webpage curl_easy_setopt(curl, CURLOPT_HTTPHEADER, headers); curl_easy_setopt(curl, CURLOPT_RETURNTRANSFER, true); res = curl_easy_perform(curl); if(CURLE_OK == res) { char *ct; // ask for the content-type res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct); if((CURLE_OK == res) && ct) printf("We received Content-Type: %s\n", ct); } } // always cleanup curl_easy_cleanup(curl);