Google App Engine Flex Environment -- WebSocket server error

[Haimonti Dutta]

Hello,

I have deployed the code posted here -- https://github.com/GoogleCloudPlatform/java-docs-samples/tree/master/appengine-java8/websocket-jetty

on the Google App Engine Flexible Environment and I am trying to test it out. Basically it creates a websocket server listener and a websocket client tries to connect to it.

It turns out that although the application deploys and load the jsp pages correctly, when the client tries to connect to the server it throws the following error:

java.util.concurrent.ExecutionException: org.eclipse.jetty.websocket.api.UpgradeException: Failed to upgrade to websocket: Unexpected HTTP Response Status Code: 400 Bad Request at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357) at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1895) at interContILP.SendServlet.sendMessageOverWebSocket(SendServlet.java:150) at interContILP.SendServlet.doPost(SendServlet.java:90) at javax.servlet.http.HttpServlet.service(HttpServlet.java:707) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:848) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1772) at com.google.apphosting.utils.servlet.JdbcMySqlConnectionCleanupFilter.doFilter(JdbcMySqlConnectionCleanupFilter.java:60) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1759) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:582) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:524) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:226) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at com.google.apphosting.runtime.jetty9.ParseBlobUploadHandler.handle(ParseBlobUploadHandler.java:119) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1182) at com.google.apphosting.runtime.jetty9.AppEngineWebAppContext.doHandle(AppEngineWebAppContext.java:187) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:512) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:185) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1112) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at com.google.apphosting.runtime.jetty9.AppVersionHandlerMap.handle(AppVersionHandlerMap.java:293) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:134) at org.eclipse.jetty.server.Server.handle(Server.java:539) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:333) at com.google.apphosting.runtime.jetty9.RpcConnection.handle(RpcConnection.java:213) at com.google.apphosting.runtime.jetty9.RpcConnector.serviceRequest(RpcConnector.java:81) at com.google.apphosting.runtime.jetty9.JettyServletEngineAdapter.serviceRequest(JettyServletEngineAdapter.java:134) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchServletRequest(JavaRuntime.java:722) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.dispatchRequest(JavaRuntime.java:685) at com.google.apphosting.runtime.JavaRuntime$RequestRunnable.run(JavaRuntime.java:655) at com.google.apphosting.runtime.JavaRuntime$NullSandboxRequestRunnable.run(JavaRuntime.java:847) at com.google.apphosting.runtime.ThreadGroupPool$PoolEntry.run(ThreadGroupPool.java:270) at java.lang.Thread.run(Thread.java:748) Caused by: org.eclipse.jetty.websocket.api.UpgradeException: Failed to upgrade to websocket: Unexpected HTTP Response Status Code: 400 Bad Request at org.eclipse.jetty.websocket.client.WebSocketUpgradeRequest.onComplete(WebSocketUpgradeRequest.java:527) at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:196) at org.eclipse.jetty.client.ResponseNotifier.notifyComplete(ResponseNotifier.java:188) at org.eclipse.jetty.client.HttpReceiver.terminateResponse(HttpReceiver.java:441) at org.eclipse.jetty.client.HttpReceiver.responseSuccess(HttpReceiver.java:387) at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.messageComplete(HttpReceiverOverHTTP.java:316) at org.eclipse.jetty.http.HttpParser.handleContentMessage(HttpParser.java:599) at org.eclipse.jetty.http.HttpParser.parseContent(HttpParser.java:1669) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:1517) at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.parse(HttpReceiverOverHTTP.java:172) at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.process(HttpReceiverOverHTTP.java:135) at org.eclipse.jetty.client.http.HttpReceiverOverHTTP.receive(HttpReceiverOverHTTP.java:73) at org.eclipse.jetty.client.http.HttpChannelOverHTTP.receive(HttpChannelOverHTTP.java:133) at org.eclipse.jetty.client.http.HttpConnectionOverHTTP.onFillable(HttpConnectionOverHTTP.java:155) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:427) at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:321) at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:159) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:117) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:698) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:804) ... 1 more

I am unable to find a reason for the 400 Http Bad Request. Any suggestions on what I may be doing wrong?

[Harmit Rishi (Cloud Platform Support)]

Hi, 

Thank you for using Google Groups!

It seems like you have reached out about this issue on our Issue Tracker thread here as well. As suggested by the agent on that thread, you may file a issue via the support-hub here with additional details of this issue. 

Cheers