code: вариант

main.cpp

@@ -42,6 +42,13 @@ write_data(void* items, size_t item_size, size_t item_count, void* ctx){
     return data_size;
 }
 
+size_t header_callback(void *items, size_t item_size, size_t item_count, void *userdata){
+    size_t data_size = item_size * item_count;
+    stringstream* buffer = reinterpret_cast<stringstream*>(userdata);
+    buffer->write(reinterpret_cast<const char*>(items), data_size);
+    return data_size;
+}
+
 Input
 download(const string& address){
     stringstream buffer;
@@ -51,6 +58,8 @@ download(const string& address){
             curl_easy_setopt(curl, CURLOPT_URL, address.c_str());
             curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, write_data);
             curl_easy_setopt(curl, CURLOPT_WRITEDATA, &buffer);
+            curl_easy_setopt(curl, CURLOPT_HEADERFUNCTION, header_callback);
+            curl_easy_setopt(curl, CURLOPT_HEADERDATA, &buffer);
             res = curl_easy_perform(curl);
             if (res != CURLE_OK) {
                 curl_easy_strerror(res);