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From Felix Schumacher <>
Subject Re: efficient redirect map with embedded Tomcat
Date Sat, 12 Oct 2019 19:35:49 GMT

Am 12.10.19 um 17:13 schrieb Garret Wilson:
> Could somebody at least point me to the best place to wire in
> site-level per-resource redirects in embedded Tomcat? I can create a
> solution, I just need to know where it is best to start.

Did you look at


> Thanks,
> Garret
> On 10/11/2019 11:06 AM, Garret Wilson wrote:
>> This is a question for Tomcat experts before I get started
>> implementing a new feature.
>> Let's say I'm embedding Tomcat to serve static files. At the time of
>> creation I know that certain paths, such as `foo/bar.txt`, should
>> redirect to other paths, such as `some/other.txt`. What's the best
>> way to configure Tomcat to do those redirects? I'm comfortable with
>> extending the source code.
>> Here are a couple of ideas that come to mind:
>>  * I could create a redirect servlet and map different instances of it
>>    to different targets in the context when I configure everything. But
>>    in Tomcat's routing engine, is the most efficient way to do things?
>>    (I assume that the servlet mappings can be placed "over" the default
>>    servlet's path space, that is, cherry-pick paths for redirection,
>>    falling back to the default file-serving servlet for non-redirect
>>    paths.)
>>  * I thought of patching into the default file servlet, overriding
>>    `org.apache.catalina.WebResource`, and creating virtual
>>    `RedirectResource` resources that don't correspond to any physical
>>    file. However it's not obvious to me where I would create a
>>    redirect. Maybe throw some redirect exception inside
>>    `WebResource.getInputStream()`? (This is probably not correct. I'm
>>    just brainstorming. The idea is sound if I knew where to put it.)
>>  * Should I install a configured rewrite valve when I'm setting up
>>    embedded Tomcat?
>>  * Is there some other routing logic in Tomcat I could tap into most
>>    efficiently, providing a known set of redirects?
>> Thanks for any guidance. I'm want to figure out the best way to
>> attack this before getting very deep in an implementation.
>> Garret
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