TaskQueue无法执行HTTP调用 – 缺少必需的标头？

错误在此代码中： 

public String getVersion() { String result = null; int index = this.getRequest().getProtocol().indexOf(47); if (index != -1) { result = this.getRequest().getProtocol().substring(index + 1); } return result; }

错误是“无法找到强制”主机“HTTP标头。”： 

 10:34:29,889 INFO [org.restlet] (Thread-6 (HornetQ-client-global-threads-1773619305)) Couldn't find the mandatory "Host" HTTP header. 10:34:29,910 WARNING [org.restlet.Component.Server] (Thread-6 (HornetQ-client-global-threads-1773619305)) Error while handling an HTTP server call: java.lang.NullPointerException at org.restlet.ext.servlet.internal.ServletCall.getVersion(ServletCall.java:370) [org.restlet.ext.servlet-2.4.0.jar:] at org.restlet.engine.adapter.ServerAdapter.toRequest(ServerAdapter.java:229) [org.restlet-2.4.0.jar:] at org.restlet.ext.servlet.internal.ServletServerAdapter.toRequest(ServletServerAdapter.java:62) [org.restlet.ext.servlet-2.4.0.jar:] at org.restlet.engine.adapter.HttpServerHelper.handle(HttpServerHelper.java:141) [org.restlet-2.4.0.jar:] at org.restlet.ext.servlet.ServerServlet.service(ServerServlet.java:1117) [org.restlet.ext.servlet-2.4.0.jar:] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [jboss-servlet-api_3.1_spec-1.0.0.Final.jar:1.0.0.Final] at io.undertow.servlet.handlers.ServletHandler.handleRequest(ServletHandler.java:86) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final]

触发此操作的代码是基本的： 

 Queue queue = QueueFactory.getQueue(milkID + "-queue"); String taskUrl = "/milks/" + milkID; queue.add(TaskOptions.Builder.withUrl(taskUrl) .param("param1", param1));

从看来这个来自这个队列的调用缺少一些东西，所以Restlet正在抛出。 奇怪的是，这个相同的代码在GAE云（Appspot）中工作，甚至在AppScale上，只有CapeDwarf才会抛出这个错误。 可能有什么不对？

这是我做的一个解决方法： 

 @Override public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException { HttpServletRequest req = (HttpServletRequest) request; String host = req.getHeader("Host"); String _protocol = req.getProtocol(); // eg HTTP/1.1 if(host == null || host.isEmpty() || _protocol == null || _protocol.isEmpty()) { host = "127.0.0.1:8080"; HeaderMapRequestWrapper requestWrapper = new HeaderMapRequestWrapper(req, "HTTP/1.1"); requestWrapper.addHeader("Host", host); System.out.println("===================================================="); System.out.println("Updating Host: " + host); System.out.println("===================================================="); chain.doFilter(requestWrapper, response); } else { chain.doFilter(req, response); } }

但它没有减少错误，而是破坏了Capedwarf运行时： 

 00:52:14,692 INFO [org.hornetq.ra] (ServerService Thread Pool -- 62) HQ151003: HornetQ resource adaptor stopped 00:52:14,663 ERROR [io.undertow.request] (Thread-0 (HornetQ-client-global-threads-710971154)) UT005023: Exception handling request to null: javax.servlet.ServletException: UT010051: Deployment ROOT.war has stopped at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:55) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at com.mycompany.HostFilter.doFilter(HostFilter.java:48) [classes:] at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at org.jboss.capedwarf.appidentity.GAEFilter.doFilter(GAEFilter.java:62) [capedwarf-appidentity-2.0.0-SNAPSHOT.jar:2.0.0-SNAPSHOT] at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:60) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:132) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:85) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at org.wildfly.extension.undertow.security.SecurityContextAssociationHandler.handleRequest(SecurityContextAssociationHandler.java:78) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:131) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:58) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:70) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.security.handlers.SecurityInitialHandler.handleRequest(SecurityInitialHandler.java:76) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at org.wildfly.extension.undertow.security.jacc.JACCContextIdHandler.handleRequest(JACCContextIdHandler.java:61) at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43) [undertow-core-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:261) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:248) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.handlers.ServletInitialHandler.dispatchMockRequest(ServletInitialHandler.java:235) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at io.undertow.servlet.spec.RequestDispatcherImpl.mock(RequestDispatcherImpl.java:425) [undertow-servlet-1.1.8.Final.jar:1.1.8.Final] at org.jboss.as.capedwarf.services.Hack.invoke(Hack.java:50) at org.jboss.as.capedwarf.services.ServletExecutor.dispatch(ServletExecutor.java:82) at org.jboss.as.capedwarf.services.ServletExecutorConsumer.onMessage(ServletExecutorConsumer.java:126) at org.hornetq.jms.client.JMSMessageListenerWrapper.onMessage(JMSMessageListenerWrapper.java:103) at org.hornetq.core.client.impl.ClientConsumerImpl.callOnMessage(ClientConsumerImpl.java:1116) at org.hornetq.core.client.impl.ClientConsumerImpl.access$500(ClientConsumerImpl.java:56) at org.hornetq.core.client.impl.ClientConsumerImpl$Runner.run(ClientConsumerImpl.java:1251) at org.hornetq.utils.OrderedExecutorFactory$OrderedExecutor$1.run(OrderedExecutorFactory.java:104) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [rt.jar:1.8.0_163] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [rt.jar:1.8.0_163] at java.lang.Thread.run(Thread.java:748) [rt.jar:1.8.0_163]

我的最佳解决方案是运行GAE SDK： 

 ./dev_appserver.sh

它没有问题就完美无缺，似乎Capedwarf错过了传递servlet链中的重要内容。

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