Tomcat version:8.0.43


I've asked a similar question in the past about illegal characters in the
http request header (May 15, 2017).

Certain users are able to send http requests to my server that contain the
space character.
This character is obviously not allowed. Tomcat recognizes it and throws an
IllegalArgumentException and a http response code 400 is returned to the
>From my logs:

*Error parsing HTTP request header...*
*java.lang.IllegalArgumentException: Invalid character found in the request
target. The valid characters are defined in RFC 7230 and RFC 3986*

Is there any way to validate the url before it reaches tomcat so that I can
return a 404 if an invalid character is found in the url? I would just like
to avoid exceptions being thrown where possible.

Thank you.

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