https://bz.apache.org/bugzilla/show_bug.cgi?id=69121
Bug ID: 69121
Summary: Async requests are being forwarded to the default
error page when the connection with the server is lost
Product: Tomcat 9
Version: 9.0.89
Hardware: PC
OS: Linux
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: eduhor...@gmail.com
Target Milestone: -----
After upgrading to Tomcat `9.0.89` I've noticed that when an async request is
terminated due to the client losing connection to the server, my application is
trying to forward the request to the application default error page, which
fails since the connection to the server is gone.
After digging a little on the changes made in this version plus some debugging,
I've found [this
commit](https://github.com/apache/tomcat/commit/31fc71858f9212fb8c1c508d3cafb852d40a6ede),
which may be the root cause.
Perhaps we should only reset the response error status for async request if the
IO is still available (I'm using [this
section](https://github.com/apache/tomcat/blob/e69545d70c4e3e7a2a16526278612d05d80cdf74/java/org/apache/catalina/core/StandardHostValve.java#L146)
as reference).
A sample implementation is available on [my fork of the
project](https://github.com/eduhoribe/tomcat/tree/9.0.x)
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