Hello, I'm trying to convert a servlet-api filter...

# ktor

[cvmocanu]

Hello,

I'm trying to convert a servlet-api filter to ktor.
The relevant code is:

if (AngularForwardingSelector.shouldForward(requestURI)) {
            val requestDispatcher = request.getRequestDispatcher(forwardToUrl)
            requestDispatcher.forward(request, response)
        } else {
            chain.doFilter(request, response)
        }

Trying the conversion, I have 2 questions:
- does ktor have around intercerptors? If not, is there a way to stop pipeline from continuing in a before interceptor?
- does kotlin have something similar to request dispatcher (for internal forwarding)?

I tried looking into interceptors, but the documentation is slim, and I can't figure it out how to make it work.

[orangy]

interceptors are core to #ktor, so absolutely yes. Please check https://ktor.io/advanced/pipeline.html for some details. But basically you need to choose a phase, install interceptor and call finish if you want to stop the pipeline.

[orangy]

requestDispatcher, do you mean HTTP redirect? or just internally reroute a call to something else?

[cvmocanu]

thanks for the finish() tip, that was what I was looking for

[cvmocanu]

requestDispatcher does an internal forward, not a redirect

[cvmocanu]

I guess, I could simultate this is Kotlin with a lambda called both from the routing and from the interceptor

[cvmocanu]

thanks for help

[orangy]

We actually want to do something like internal redirect, but lacked real use cases. Could you explain what and why do you need to redirect?