[java] Close http connection for RemoteNode (#13313)

Author: pujagani

java/src/org/openqa/selenium/grid/distributor/local/LocalDistributor.java

@@ -459,6 +459,12 @@ public void remove(NodeId nodeId) {
     Lock writeLock = lock.writeLock();
     writeLock.lock();
     try {
+      Node node = nodes.get(nodeId);
+
+      if (node instanceof RemoteNode) {
+        ((RemoteNode) node).close();
+      }
+
       nodes.remove(nodeId);
       model.remove(nodeId);
       allChecks.remove(nodeId);

java/src/org/openqa/selenium/grid/node/remote/RemoteNode.java

@@ -30,6 +30,7 @@
 
 import com.google.common.collect.ImmutableMap;
 import com.google.common.collect.ImmutableSet;
+import java.io.Closeable;
 import java.io.IOException;
 import java.io.Reader;
 import java.io.UncheckedIOException;
@@ -67,7 +68,7 @@
 import org.openqa.selenium.remote.tracing.HttpTracing;
 import org.openqa.selenium.remote.tracing.Tracer;
 
-public class RemoteNode extends Node {
+public class RemoteNode extends Node implements Closeable {
 
   public static final Json JSON = new Json();
   private final HttpHandler client;
@@ -267,6 +268,11 @@ private Map<String, Object> toJson() {
         "capabilities", capabilities);
   }
 
+  @Override
+  public void close() {
+    ((HttpClient) (this.client)).close();
+  }
+
   private class RemoteCheck implements HealthCheck {
     @Override
     public Result check() {