https://issues.apache.org/bugzilla/show_bug.cgi?id=49770

--- Comment #3 from Konstantin Kolinko <knst.koli...@gmail.com> 2010-08-18 
10:46:58 EDT ---
If you would look at the following lines:
> AjpMessage.appendString(AjpMessage.java:239)
> AjpAprProcessor.prepareResponse(AjpAprProcessor.java:1005)

you will see that that is where AjpAprProcessor sends HTTP response headers.
Some of those headers have value of null, which is illegal. You cannot pass
null to response.addHeader() or setHeader() methods.

By the way, AjpMessage.appendString() recovers from this gracefully, by writing
out an empty string instead of the null, but logs the error that you are
seeing.

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