getResponseHeaders function

Future<Map<String, String>?> getResponseHeaders(Uri url, { HttpMethod method = HttpMethod.get, Object? body, Map<String, String> headers = const {}, bool debug = false, ProxyAPIConfig? proxyAPIConfig, })

Makes a request and returns the response headers instead of the body.

Used by the responseHeaders parser to pull values (e.g. set-cookie) out of a response. Supports GET and POST. Header keys are lower-cased by the http client. Returns null on any network/timeout error.

Implementation

Future<Map<String, String>?> getResponseHeaders(
  Uri url, {
  HttpMethod method = HttpMethod.get,
  Object? body,
  Map<String, String> headers = const {},
  bool debug = false,
  ProxyAPIConfig? proxyAPIConfig,
}) async {
  printLog("HTTP ${method.name.toUpperCase()} (headers): $url", debug,
      color: LogColor.yellow);
  if (proxyAPIConfig != null) {
    printLog("Prepending proxy URL...", debug, color: LogColor.yellow);
    url = proxyAPIConfig.generateUrl(url);
  }
  printLog("URL: $url", debug, color: LogColor.yellow);
  printLog("HEADERS: $headers", debug, color: LogColor.yellow);
  try {
    final response = await (method == HttpMethod.post
            ? http.post(url, headers: headers, body: body)
            : http.get(url, headers: headers))
        .timeout(
      Duration(seconds: 30),
    );
    printLog(
      "HTTP Response: ${response.statusCode}",
      debug,
      color: LogColor.yellow,
    );
    throwIfNotFound(response.statusCode, url, debug);
    printLog(
      "HTTP Response headers: ${response.headers}",
      debug,
      color: LogColor.yellow,
    );
    return response.headers;
  } on WebScraperError {
    rethrow;
  } catch (e) {
    printLog(e.toString(), debug, color: LogColor.red);
    return null;
  }
}