Synapse throws "org.apache.http.ProtocolException: Transfer-encoding header
already present" on multiple sends to client
-------------------------------------------------------------------------------------------------------------------------
Key: SYNAPSE-740
URL: https://issues.apache.org/jira/browse/SYNAPSE-740
Project: Synapse
Issue Type: Bug
Components: Transports
Reporter: Udayanga Wickramasinghe
<sequence name="main">
<in>
<property name="direction" value="incoming"/>
<sequence key="stockquote"/>
</in>
<out>
<send/>
<send/>
</out>
</sequence>
For a configuration with multiple sends as shown above synapse throws following
error ;
2011-03-11 10:59:21,844 [-] [HttpClientWorker-1] ERROR HttpCoreNIOSender
Unexpected HTTP protocol error sending response to : 127.0.0.1
org.apache.http.ProtocolException: Transfer-encoding header already present
at
org.apache.http.protocol.ResponseContent.process(ResponseContent.java:63)
at
org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:211)
at
org.apache.synapse.transport.nhttp.ServerHandler.commitResponse(ServerHandler.java:374)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:513)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:311)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
at
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:159)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:254)
at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:84)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
at
org.apache.synapse.mediators.filters.OutMediator.mediate(OutMediator.java:55)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:176)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:364)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:159)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at
org.apache.synapse.transport.nhttp.ClientWorker.run(ClientWorker.java:252)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:173)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
2011-03-11 10:59:21,845 [-] [HttpClientWorker-1] ERROR Axis2Sender Unexpected
error sending message back
org.apache.axis2.AxisFault: Unexpected HTTP protocol error sending response to
: 127.0.0.1
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.handleException(HttpCoreNIOSender.java:818)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:544)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.invoke(HttpCoreNIOSender.java:311)
at org.apache.axis2.engine.AxisEngine.send(AxisEngine.java:443)
at
org.apache.synapse.core.axis2.Axis2Sender.sendBack(Axis2Sender.java:159)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.send(Axis2SynapseEnvironment.java:254)
at
org.apache.synapse.mediators.builtin.SendMediator.mediate(SendMediator.java:84)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
at
org.apache.synapse.mediators.filters.OutMediator.mediate(OutMediator.java:55)
at
org.apache.synapse.mediators.AbstractListMediator.mediate(AbstractListMediator.java:60)
at
org.apache.synapse.mediators.base.SequenceMediator.mediate(SequenceMediator.java:114)
at
org.apache.synapse.core.axis2.Axis2SynapseEnvironment.injectMessage(Axis2SynapseEnvironment.java:176)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.handleMessage(SynapseCallbackReceiver.java:364)
at
org.apache.synapse.core.axis2.SynapseCallbackReceiver.receive(SynapseCallbackReceiver.java:159)
at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:181)
at
org.apache.synapse.transport.nhttp.ClientWorker.run(ClientWorker.java:252)
at
org.apache.axis2.transport.base.threads.NativeWorkerPool$1.run(NativeWorkerPool.java:173)
at
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: org.apache.http.ProtocolException: Transfer-encoding header already
present
at
org.apache.http.protocol.ResponseContent.process(ResponseContent.java:63)
at
org.apache.http.protocol.BasicHttpProcessor.process(BasicHttpProcessor.java:211)
at
org.apache.synapse.transport.nhttp.ServerHandler.commitResponse(ServerHandler.java:374)
at
org.apache.synapse.transport.nhttp.HttpCoreNIOSender.sendAsyncResponse(HttpCoreNIOSender.java:513)
... 18 more
2011-03-11 10:59:21,846 [-] [HttpClientWorker-1] ERROR SynapseCallbackReceiver
Synapse encountered an exception, No error handlers found - [Message Dropped]
Unexpected error sending message back
It is better if we just gracefully log this as error rather than throwing a
Fault
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