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From André Warnier (tomcat)>
Subject Re: how to write a valve
Date Fri, 14 Oct 2016 07:24:55 GMT
On 13.10.2016 17:04, Campbell, Lance wrote:
> Tomcat 8.0.38
> In my Eclipse development environment when particular servlet requests are made I want
to simulate going through Shibboleth prior to Tomcat handling the request.  I wanted to see
if this will work.
> In Eclipse within each dynamic web application I would add a valve to the context.xml
> The valve would:
> 1)      Check the URL request.
> 2)      If the URL string matches a list then it will add particular name value pairs
to the request.
> Example of a possible valve:
> <Valve className="my.valves.ShibbolethSimulationValve" />
> 1)      Can a valve actually identify a particular URL path?
> 2)      Can a valve add an attribute to the request prior to the servlet getting the
> 3)      If item #1 and #2 will work does anyone have some base code for a value that
would get me started down the correct path?


I think the best thing here is to point you to Google. If you search for 
"HttpServletRequest immutable", you'll get a whole bunch of useful links.
There is also example code there.

The basic thing here, is that the HttpServletRequest object that you get originally, is 
*immutable* (can't be modified, for example to add a header or add additional parameters).
So you have to "wrap" it with a HttpServletRequestWrapper, and then override some of the 
standard methods in that wrapper.

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