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: bgstew...@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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