hi I’ve created a PolyHandler with a http and WS (see <https://www.http4k.org/guide/howto/serve_webs...

# http4k

[Michael Hayes]

hi
I’ve created a PolyHandler with a http and WS (see https://www.http4k.org/guide/howto/serve_websockets/)

When testing I’m getting the “has been blocked by CORS policy” error.

I’ve found the code normally used to set the CORS policy but I’m struggling to apply it to the PolyHandler, can you help?

CorsPolicy(OriginPolicy.AllowAll(), listOf("content-type", "Authorization"), Method.values().toList(), true)

[dave]

Is it a problem with the webaocket or the http?

[Michael Hayes]

hi
This was a problem with the http.
The following code is now working ok:

val unsafeGlobalPermissive =
    CorsPolicy(OriginPolicy.AllowAll(), listOf("content-type", "Authorization"), Method.values().toList(), true)

val events = defaultEvents()
val apiWithCors = ServerFilters.Cors(unsafeGlobalPermissive)
    .then(CatchAll(events))
    .then(api)

val poly = PolyHandler(apiWithCors, ws)
poly.asServer(Undertow(port)).start()

[Michael Hayes]

Issue resolved.

[Michael Hayes]

thanks

[dave]

great that you've worked it out.

[dave]

I was just having a go and was trying to recreate

[Michael Hayes]

thanks for looking into it 👍

[dave]

there's also a trick you can do with lists of filters:

[dave]

val fil1 = Filter { next ->
        {
            next(it)
        }
    }
    val fil2 = Filter { next ->
        {
            next(it)
        }
    }

    val all: Filter = listOf(fil1, fil2).reduce(Filter::then)

[dave]

you can reduce them! 🙂

[Michael Hayes]

👍