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From "Sangjin Lee (JIRA)" <j...@apache.org>
Subject [jira] Created: (GERONIMO-3824) ProtocolDecoderException is thrown if the response does not specify Content-Length but is not chunked
Date Thu, 07 Feb 2008 00:49:08 GMT
ProtocolDecoderException is thrown if the response does not specify Content-Length but is not
chunked
-----------------------------------------------------------------------------------------------------

                 Key: GERONIMO-3824
                 URL: https://issues.apache.org/jira/browse/GERONIMO-3824
             Project: Geronimo
          Issue Type: Bug
      Security Level: public (Regular issues)
          Components: AsyncHttpClient
    Affects Versions: 1.x
            Reporter: Sangjin Lee


I've been testing AHC against different servers, and found an interesting case.

I configured AHC not to reuse connections (which makes AHC insert "Connection: close" in its
requests).  Then I pointed to a main index.jsp page for a Tomcat 5.5.25 installation.  What
I noticed then is the server does not chunk the content nor sends the Content-Length header.
 It simply closes the connection to terminate.

This is not a good thing to do, but it is not exactly illegal either, it appears according
to the spec.  In this case, however, the protocol codec gets confused, and throws a StringIndexOutOfBoundsException.

HttpResponseDecoder makes an explicit assumption that you either chunk the response or specify
the Content-Length header.  Please see HttpResponseCoder.processContent(), and notice the
lack of the else clause.  As a result, HttpResponseCoder transitions to the STATE_CONTENT_READ
state, and thinks it is done with the response (although the content is null).  But HttpResponseDecoder
gets invoked again right away, and that second entry into doDecode() is what throws the exception.
 Please see the following call stack.

I think at least we should be able to handle a case where the server terminates a response
without specifying the Content-Length header...


org.apache.mina.filter.codec.ProtocolDecoderException: java.lang.StringIndexOutOfBoundsException
(Hexdump: <omitted>)
	at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:164)
	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)
	at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)
	at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)
	at org.apache.mina.filter.support.SSLHandler.flushScheduledEvents(SSLHandler.java:275)
	at org.apache.mina.filter.SSLFilter.messageReceived(SSLFilter.java:427)
	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)
	at org.apache.mina.common.support.AbstractIoFilterChain.access$1100(AbstractIoFilterChain.java:53)
	at org.apache.mina.common.support.AbstractIoFilterChain$EntryImpl$1.messageReceived(AbstractIoFilterChain.java:648)
	at org.apache.mina.common.support.AbstractIoFilterChain$HeadFilter.messageReceived(AbstractIoFilterChain.java:499)
	at org.apache.mina.common.support.AbstractIoFilterChain.callNextMessageReceived(AbstractIoFilterChain.java:299)
	at org.apache.mina.common.support.AbstractIoFilterChain.fireMessageReceived(AbstractIoFilterChain.java:293)
	at org.apache.mina.transport.socket.nio.SocketIoProcessor.read(SocketIoProcessor.java:228)
	at org.apache.mina.transport.socket.nio.SocketIoProcessor.process(SocketIoProcessor.java:198)
	at org.apache.mina.transport.socket.nio.SocketIoProcessor.access$400(SocketIoProcessor.java:45)
	at org.apache.mina.transport.socket.nio.SocketIoProcessor$Worker.run(SocketIoProcessor.java:485)
	at org.apache.mina.util.NamePreservingRunnable.run(NamePreservingRunnable.java:51)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:665)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:690)
	at java.lang.Thread.run(Thread.java:803)
Caused by: java.lang.StringIndexOutOfBoundsException
	at java.lang.String.substring(String.java:1088)
	at org.apache.ahc.codec.HttpDecoder.decodeStatus(HttpDecoder.java:145)
	at org.apache.ahc.codec.HttpResponseDecoder.processStatus(HttpResponseDecoder.java:276)
	at org.apache.ahc.codec.HttpResponseDecoder.doDecode(HttpResponseDecoder.java:61)
	at org.apache.mina.filter.codec.CumulativeProtocolDecoder.decode(CumulativeProtocolDecoder.java:133)
	at org.apache.mina.filter.codec.ProtocolCodecFilter.messageReceived(ProtocolCodecFilter.java:157)
	... 19 more


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