Function http_request

http.c:2224–2314

#define HTTP_REQUEST_FILE	1

static int http_request(const char *url,
			void *result, int target,
			struct http_get_options *options)
{
	struct active_request_slot *slot;
	struct slot_results results = { .retry_after = -1 };
	struct curl_slist *headers = http_copy_default_headers();
	struct strbuf buf = STRBUF_INIT;
	const char *accept_language;
	int ret;

	slot = get_active_slot();
	curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1L);

	if (!result) {
		curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1L);
	} else {
		curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0L);
		curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);

		if (target == HTTP_REQUEST_FILE) {
			off_t posn = ftello(result);
			curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
					 fwrite);
			if (posn > 0)
				http_opt_request_remainder(slot->curl, posn);
		} else
			curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
					 fwrite_buffer);
	}

	curl_easy_setopt(slot->curl, CURLOPT_HEADERFUNCTION, fwrite_wwwauth);

	accept_language = http_get_accept_language_header();

	if (accept_language)
		headers = curl_slist_append(headers, accept_language);

	strbuf_addstr(&buf, "Pragma:");
	if (options->no_cache)
		strbuf_addstr(&buf, " no-cache");
	if (options->initial_request &&
	    http_follow_config == HTTP_FOLLOW_INITIAL)
		curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1L);

	headers = curl_slist_append(headers, buf.buf);

	/* Add additional headers here */
	if (options->extra_headers) {
		const struct string_list_item *item;
		for_each_string_list_item(item, options->extra_headers)
			headers = curl_slist_append(headers, item->string);
	}

	headers = http_append_auth_header(&http_auth, headers);

	curl_easy_setopt(slot->curl, CURLOPT_URL, url);
	curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);