https://bz.apache.org/bugzilla/show_bug.cgi?id=69405

--- Comment #1 from Chuck Caldarale <n82...@gmail.com> ---
Points of clarification:


The statement:

"What is happening is that the function isAsyncSupported() returns a boolean
saying whether across the whole server async is not supported"

is not correct; asyncSupport is evaluated for each part of the request chain,
not for the whole server.


This message in the log:

"Please check your servlet configuration - all Servlet instances and Servlet
filters involved in the request processing must explicitly declare support for
asynchronous request processing."

indicates what must be done in the webapp's configuration.


Also, this statement is misleading:

"The error message needs to be updated to include the name of whatever part of
Tomcat that does not support async, so that it can be removed."

It's not a "part of Tomcat" that needs to be changed, but rather the webapp
must be written and configured for asynchronous processing.

Although it would be useful for Tomcat to display which component of the webapp
cannot handle asynchronous mode, remembering that could be difficult in a
complex servlet/filter chain when the switch to async occurs many layers deep
in the webapp.

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