gistfile1.c

ASSERT(curl_easy_setopt(ch, CURLOPT_PROTOCOLS, CURLPROTO_HTTP) == CURLE_OK);
ASSERT(curl_easy_setopt(ch, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTP) == CURLE_OK);

// main loop, for all URL's
while (1) {
	CURLcode code;
	int currentRedirectIteration = 0;
	long httpResponseCode;
	char buffer[URL_MAX];
	char *url[URL_MAX];
	getUrl(url);
	if (!strlen(url)) {
		break;
	}

	// loop need only for manually redirect handling
	while (1) {
		curl_easy_setopt(ch, CURLOPT_NOBODY, 0L);
		curl_easy_setopt(ch, CURLOPT_HTTPGET, 1L);
		curl_easy_setopt(ch, CURLOPT_URL, url);
		code = curl_easy_perform(ch);

		// curl error
		if (code != CURLE_OK) {
			break;
		}

		// redirect
		curl_easy_getinfo(ch, CURLINFO_RESPONSE_CODE, &httpResponseCode)
		if ((httpResponseCode == HTTP_STATUS_MOVED_PERMANENTLY) || (httpResponseCode == HTTP_STATUS_FOUND)) {
			currentRedirectIteration++;

			curl_easy_getinfo(ch, CURLINFO_REDIRECT_URL, &buffer);
			if (!buffer) {
				break;
			}

			strncpy(url, buffer, strlen(buffer) + 1 /* + null byte */);

			// reset "Host: "
			curl_easy_setopt(ch, CURLOPT_HTTPHEADER, NULL);

			// we have redirect, need to fetch next URL
			// but only if we not exceed redirect limit
			if (currentRedirectIteration <= MAXIMUM_REDIRECTS) {
				continue;
			}

			// exceed redirect limit
		}
	}
}