[java] consume the input of the connection

Author: joerg1985

java/src/org/openqa/selenium/net/UrlChecker.java

@@ -20,6 +20,7 @@
 import static java.util.concurrent.TimeUnit.MILLISECONDS;
 
 import java.io.IOException;
+import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
 import java.util.Arrays;
@@ -75,6 +76,7 @@ public void waitUntilAvailable(long timeout, TimeUnit unit, final URL... urls)
                       // Ok, try again.
                     } finally {
                       if (connection != null) {
+                        consume(connection);
                         connection.disconnect();
                       }
                     }
@@ -127,6 +129,7 @@ public void waitUntilUnavailable(long timeout, TimeUnit unit, final URL url)
                     return null;
                   } finally {
                     if (connection != null) {
+                      consume(connection);
                       connection.disconnect();
                     }
                   }
@@ -154,6 +157,27 @@ public void waitUntilUnavailable(long timeout, TimeUnit unit, final URL url)
     }
   }
 
+  /**
+   * Read and closes the ErrorStream / InputStream of the HttpURLConnection to allow Java reusing
+   * the open socket.
+   *
+   * @param connection the connection to consume the input
+   */
+  private static void consume(HttpURLConnection connection) {
+    try {
+      InputStream data = connection.getErrorStream();
+      if (data == null) {
+        data = connection.getInputStream();
+      }
+      if (data != null) {
+        data.readAllBytes();
+        data.close();
+      }
+    } catch (IOException e) {
+      // swallow
+    }
+  }
+
   private HttpURLConnection connectToUrl(URL url) throws IOException {
     HttpURLConnection connection = (HttpURLConnection) url.openConnection();
     connection.setConnectTimeout(CONNECT_TIMEOUT_MS);