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From bugzi...@apache.org
Subject DO NOT REPLY [Bug 48940] New: IIS to Tomcat occasionally fails on POST with T-E chunked header
Date Thu, 18 Mar 2010 20:22:55 GMT
https://issues.apache.org/bugzilla/show_bug.cgi?id=48940

           Summary: IIS to Tomcat occasionally fails on POST with T-E
                    chunked header
           Product: Tomcat Connectors
           Version: unspecified
          Platform: PC
        OS/Version: Windows Server 2008 (Longhorn)
            Status: NEW
          Severity: major
          Priority: P2
         Component: isapi
        AssignedTo: dev@tomcat.apache.org
        ReportedBy: bgstewart@covad.net


This is related to bug 48763.


We are experiencing intermittent timeouts of POST requests with
transfer-encoding: chunked.

These failures occur very frequently after IIS has shutdown ISAPI_Redirect
because of a period of inactivity. The next request triggers IIS to restart the
redirector, and that request and several more that queue up behind it fail. JK
puts the worker in error state. Eventually, the failure gets back to the
client.


I've done some tracing and this is what I see:

- The requests that fail do arrive at the Tomcat. Tomcat times out trying to
read the post body.

- The failing AJP request messages from ISAPI both a positive content-length
and "transfer-encoding: chunked". Ordinary requests don't have the c-l.


My guess is,

 1) If IIS is able to receive and assemble the chunked body before JK asks for
it, IIS reports the actual size instead of -1.

 2) This possibly occurs while ISAPI_Redirect is reinitializing because there
is time for IIS to build the body before JK needs it.

 3) When this occurs, the JK end of the APR connection waits for a
get-body-chunk message. The Tomcat APR sees the positive c-l and waits for the
free body chunk that non t-e requests send.

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