hii im trying the backend framework http4k using this tutorial https://www.http4k.org/guide/tutorials/your_first_http4k_app/ it says on step5:

Try running the client by hitting the little green arrow on line 11. You'll see the

Response

printed to the console by the

Filter

, followed by a repeat of the body content, which is printed by line 18.

but Im not able to see any response. I have also run my server. even if my server is not running, it should show some error like server unavailable, no? but it just hangs there I think. I even add a few logs to try debug. pls help thanks

Try this:

import org.http4k.client.JavaHttpClient
import org.http4k.core.Method
import org.http4k.core.Request
import org.http4k.core.Response
import org.http4k.core.Status.Companion.OK
import org.http4k.core.then
import org.http4k.filter.DebuggingFilters.PrintResponse
import org.http4k.server.SunHttp
import org.http4k.server.asServer

fun main() {
    val server = { _: Request -> Response(OK).body("pong") }
    val runningServer = server.asServer(SunHttp(9000)).start()

    val client = JavaHttpClient()
    val printingClient = PrintResponse().then(client)

    printingClient(Request(Method.GET, "<http://localhost:9000/ping>"))

    runningServer.stop()
}

That code prints:

***** RESPONSE 200 to GET: <http://localhost:9000/ping> *****
HTTP/1.1 200 
content-length: 4
date: Sun, 29 Oct 2023 08:54:56 GMT

pong

Process finished with exit code 0

thx but still not working for me😩

I can't spot anything wrong in the code. Can you try it on a different port?

oo yes, it works. thx:)

Yes, that's a subtle issue: in some operating systems you can have more than one process serving on the same port, and that's not always easy to spot.

what do u mean? if its dynamic then how do we know if it keeps changing

I mean for running locally and for testing, where you control both client and servers, you can make servers dynamic and orchestrate client creation so they know what to call.