How to use

setConnectTimeout

method

in

java.net.HttpURLConnection

/**
 * Connects to the given HTTP URL and configure time out, to avoid infinite hang.
 */
private static HttpURLConnection open(URL url) throws IOException {
  HttpURLConnection c = (HttpURLConnection)url.openConnection();
  c.setReadTimeout(TIMEOUT);
  c.setConnectTimeout(TIMEOUT);
  return c;
}

@SuppressWarnings("WeakerAccess")
protected void configureTimeouts(@NonNull HttpURLConnection connection, int connectionTimeOut, int socketTimeOut) {
  connection.setConnectTimeout(connectionTimeOut);
  connection.setReadTimeout(socketTimeOut);
}

/**
 * Template method for preparing the given {@link HttpURLConnection}.
 * <p>The default implementation prepares the connection for input and output, and sets the HTTP method.
 * @param connection the connection to prepare
 * @param httpMethod the HTTP request method ({@code GET}, {@code POST}, etc.)
 * @throws IOException in case of I/O errors
 */
protected void prepareConnection(HttpURLConnection connection, String httpMethod) throws IOException {
  if (this.connectTimeout >= 0) {
    connection.setConnectTimeout(this.connectTimeout);
  }
  if (this.readTimeout >= 0) {
    connection.setReadTimeout(this.readTimeout);
  }
  connection.setDoInput(true);
  if ("GET".equals(httpMethod)) {
    connection.setInstanceFollowRedirects(true);
  }
  else {
    connection.setInstanceFollowRedirects(false);
  }
  if ("POST".equals(httpMethod) || "PUT".equals(httpMethod) ||
      "PATCH".equals(httpMethod) || "DELETE".equals(httpMethod)) {
    connection.setDoOutput(true);
  }
  else {
    connection.setDoOutput(false);
  }
  connection.setRequestMethod(httpMethod);
}

public static String getFromHTTP(String url, Time timeout) throws Exception {
  final URL u = new URL(url);
  LOG.info("Accessing URL " + url + " as URL: " + u);
  final long deadline = timeout.toMilliseconds() + System.currentTimeMillis();
  while (System.currentTimeMillis() <= deadline) {
    HttpURLConnection connection = (HttpURLConnection) u.openConnection();
    connection.setConnectTimeout(100000);
    connection.connect();
    if (Objects.equals(HttpResponseStatus.SERVICE_UNAVAILABLE, HttpResponseStatus.valueOf(connection.getResponseCode()))) {
      // service not available --> Sleep and retry
      LOG.debug("Web service currently not available. Retrying the request in a bit.");
      Thread.sleep(100L);
    } else {
      InputStream is;
      if (connection.getResponseCode() >= 400) {
        // error!
        LOG.warn("HTTP Response code when connecting to {} was {}", url, connection.getResponseCode());
        is = connection.getErrorStream();
      } else {
        is = connection.getInputStream();
      }
      return IOUtils.toString(is, ConfigConstants.DEFAULT_CHARSET);
    }
  }
  throw new TimeoutException("Could not get HTTP response in time since the service is still unavailable.");
}

 urlConnection.addRequestProperty(headerEntry.getKey(), headerEntry.getValue());
urlConnection.setConnectTimeout(timeout);
urlConnection.setReadTimeout(timeout);
urlConnection.setUseCaches(false);
urlConnection.setDoInput(true);
  throw new HttpException("Received empty or null redirect url");
 URL redirectUrl = new URL(url, redirectUrlString);

private HttpURLConnection create(URL url) throws IOException {
  HttpURLConnection connection = (HttpURLConnection) url.openConnection();
  connection.setRequestProperty("Accept", "application/*");
  connection.setConnectTimeout(10000);
  return connection;
}

/**
 * ping the url, return true if ping ok, false otherwise
 */
public static boolean pingUrl(String address) {
 try {
  URL urlObj = new URL(address);
  HttpURLConnection connection = (HttpURLConnection) urlObj.openConnection();
  connection.setRequestMethod("GET");
  connection.setUseCaches(false);
  connection.setConnectTimeout(DEFAULT_TIMEOUT_IN_SECONDS);
  connection.setReadTimeout(DEFAULT_TIMEOUT_IN_SECONDS);
  int statusCode = connection.getResponseCode();
  cleanUpConnection(connection);
  return (200 <= statusCode && statusCode <= 399);
 } catch (Throwable ignore) {
 }
 return false;
}

public static String getFromHTTP(String url) throws Exception {
  URL u = new URL(url);
  HttpURLConnection connection = (HttpURLConnection) u.openConnection();
  connection.setConnectTimeout(100000);
  connection.connect();
  InputStream is;
  if (connection.getResponseCode() >= 400) {
    // error!
    is = connection.getErrorStream();
  } else {
    is = connection.getInputStream();
  }
  return IOUtils.toString(is, connection.getContentEncoding() != null ? connection.getContentEncoding() : "UTF-8");
}

  huc = (HttpsURLConnection) this.url.openConnection();
  huc = (HttpURLConnection) this.url.openConnection();
huc.setConnectTimeout(0); // Never timeout
huc.setRequestProperty("accept",  "*/*");
huc.setRequestProperty("Referer", this.url.toExternalForm()); // Sic
huc.setRequestProperty("User-agent", AbstractRipper.USER_AGENT);
tries += 1;
logger.debug("Request properties: " + huc.getRequestProperties().toString());

/**
 * Open a connection to the given URL.
 *
 * @param requestTokenURL The request token URL.
 * @return The HTTP URL connection.
 */
protected HttpURLConnection openConnection(URL requestTokenURL) {
 try {
  HttpURLConnection connection = (HttpURLConnection) requestTokenURL.openConnection(selectProxy(requestTokenURL));
  connection.setConnectTimeout(getConnectionTimeout());
  connection.setReadTimeout(getReadTimeout());
  return connection;
 }
 catch (IOException e) {
  throw new OAuthRequestFailedException("Failed to open an OAuth connection.", e);
 }
}

  @Override
  protected void prepareConnection(HttpURLConnection con,
                   int contentLength) throws IOException {
    super.prepareConnection(con, contentLength);
    con.setReadTimeout(url.getParameter(Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT));
    con.setConnectTimeout(url.getParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT));
  }
};

public HttpURLConnection connectToEndpoint(URI endpoint, Map<String, String> headers) throws IOException {
  HttpURLConnection connection = (HttpURLConnection) endpoint.toURL().openConnection(Proxy.NO_PROXY);
  connection.setConnectTimeout(1000 * 2);
  connection.setReadTimeout(1000 * 5);
  connection.setRequestMethod("GET");
  connection.setDoOutput(true);
  for (Map.Entry<String, String> header : headers.entrySet()) {
    connection.addRequestProperty(header.getKey(), header.getValue());
  }
  // TODO should we autoredirect 3xx
  // connection.setInstanceFollowRedirects(false);
  connection.connect();
  return connection;
}

@Test
public void testResponseHeaders() throws Exception {
  // check headers for successful json response
  URL taskManagersUrl = new URL("http://localhost:" + getRestPort() + "/taskmanagers");
  HttpURLConnection taskManagerConnection = (HttpURLConnection) taskManagersUrl.openConnection();
  taskManagerConnection.setConnectTimeout(100000);
  taskManagerConnection.connect();
  if (taskManagerConnection.getResponseCode() >= 400) {
    // error!
    InputStream is = taskManagerConnection.getErrorStream();
    String errorMessage = IOUtils.toString(is, ConfigConstants.DEFAULT_CHARSET);
    throw new RuntimeException(errorMessage);
  }
  // we don't set the content-encoding header
  Assert.assertNull(taskManagerConnection.getContentEncoding());
  Assert.assertEquals("application/json; charset=UTF-8", taskManagerConnection.getContentType());
  // check headers in case of an error
  URL notFoundJobUrl = new URL("http://localhost:" + getRestPort() + "/jobs/dontexist");
  HttpURLConnection notFoundJobConnection = (HttpURLConnection) notFoundJobUrl.openConnection();
  notFoundJobConnection.setConnectTimeout(100000);
  notFoundJobConnection.connect();
  if (notFoundJobConnection.getResponseCode() >= 400) {
    // we don't set the content-encoding header
    Assert.assertNull(notFoundJobConnection.getContentEncoding());
    Assert.assertEquals("application/json; charset=UTF-8", notFoundJobConnection.getContentType());
  } else {
    throw new RuntimeException("Request for non-existing job did not return an error.");
  }
}

  @Override
  protected void prepareConnection(HttpURLConnection con,
                   int contentLength) throws IOException {
    super.prepareConnection(con, contentLength);
    con.setReadTimeout(url.getParameter(Constants.TIMEOUT_KEY, Constants.DEFAULT_TIMEOUT));
    con.setConnectTimeout(url.getParameter(Constants.CONNECT_TIMEOUT_KEY, Constants.DEFAULT_CONNECT_TIMEOUT));
  }
};

/**
 * Create {@linkplain HttpURLConnection HTTP connection} for incoming URL
 *
 * @param url   URL to connect to
 * @param extra Auxiliary object which was passed to {@link DisplayImageOptions.Builder#extraForDownloader(Object)
 *              DisplayImageOptions.extraForDownloader(Object)}; can be null
 * @return {@linkplain HttpURLConnection Connection} for incoming URL. Connection isn't established so it still configurable.
 * @throws IOException if some I/O error occurs during network request or if no InputStream could be created for
 *                     URL.
 */
protected HttpURLConnection createConnection(String url, Object extra) throws IOException {
  String encodedUrl = Uri.encode(url, ALLOWED_URI_CHARS);
  HttpURLConnection conn = (HttpURLConnection) new URL(encodedUrl).openConnection();
  conn.setConnectTimeout(connectTimeout);
  conn.setReadTimeout(readTimeout);
  return conn;
}

private HttpURLConnection createConnection(URL url, String method, boolean doOutput) {
  HttpURLConnection con;
  try {
    con = (HttpURLConnection) url.openConnection();
    con.setRequestMethod(method);
    con.setConnectTimeout(connectTimeout);
    con.setReadTimeout(readTimeout);
    con.setDoOutput(doOutput);
    con.setDoInput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-Type", "text/plain");
    return con;
  } catch (IOException e) {
    e.printStackTrace();
    return null;
  }
}

private HttpURLConnection createConnection(URL url, String method, boolean doOutput) {
  HttpURLConnection con;
  try {
    con = (HttpURLConnection) url.openConnection();
    con.setRequestMethod(method);
    con.setConnectTimeout(connectTimeout);
    con.setReadTimeout(readTimeout);
    con.setDoOutput(doOutput);
    con.setDoInput(true);
    con.setUseCaches(false);
    con.setRequestProperty("Content-Type", "text/plain");
    return con;
  } catch (IOException e) {
    e.printStackTrace();
    return null;
  }
}

public HttpURLConnection createConnection(String urlStr) throws IOException {
  URL url = new URL(urlStr);
  HttpURLConnection conn = (HttpURLConnection) url.openConnection();
  // Will yield in a POST request: conn.setDoOutput(true);
  conn.setDoInput(true);
  conn.setUseCaches(true);
  conn.setRequestProperty("Referrer", referrer);
  conn.setRequestProperty("User-Agent", userAgent);
  // suggest respond to be gzipped or deflated (which is just another compression)
  // http://stackoverflow.com/q/3932117
  conn.setRequestProperty("Accept-Encoding", acceptEncoding);
  conn.setReadTimeout(timeout);
  conn.setConnectTimeout(timeout);
  return conn;
}

 protected HttpURLConnection createHttpUrlConnection(final String host, final int port,
   final int timeoutInMs) throws IOException {
  URL initialUrl = new URL(host);
  URL url = new URL(initialUrl.getProtocol(), initialUrl.getHost(), port, initialUrl.getFile());
  HttpURLConnection urlConnection = (HttpURLConnection) url.openConnection();
  urlConnection.setConnectTimeout(timeoutInMs);
  urlConnection.setReadTimeout(timeoutInMs);
  urlConnection.setInstanceFollowRedirects(false);
  urlConnection.setUseCaches(false);
  return urlConnection;
 }
}

private static HttpURLConnection getHttpConnection(String url, String method, Map<String, String> headers) throws IOException, NoSuchAlgorithmException, NoSuchProviderException, KeyManagementException {
  URL _url = new URL(url);
  HttpURLConnection conn = (HttpURLConnection)_url.openConnection();
  if (conn instanceof HttpsURLConnection) {
    ((HttpsURLConnection)conn).setSSLSocketFactory(sslSocketFactory);
    ((HttpsURLConnection)conn).setHostnameVerifier(trustAnyHostnameVerifier);
  }
  
  conn.setRequestMethod(method);
  conn.setDoOutput(true);
  conn.setDoInput(true);
  
  conn.setConnectTimeout(19000);
  conn.setReadTimeout(19000);
  
  conn.setRequestProperty("Content-Type","application/x-www-form-urlencoded");
  conn.setRequestProperty("User-Agent", "Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/33.0.1750.146 Safari/537.36");
  
  if (headers != null && !headers.isEmpty()) {
    for (Entry<String, String> entry : headers.entrySet()) {
      conn.setRequestProperty(entry.getKey(), entry.getValue());
    }
  }
  
  return conn;
}