:question: How do we make non-blocking http post r...

# spring

[Alfy]

❓ How do we make non-blocking http post request in springboot? I have service A that is making about 100 or so request to service B. I want service A to make non-blocking http post request, that is make the http post request but don't wait for a response to make another one.

[Emil Kantis]

Not Kotlin, but look into Webflux.

[Saharath Kleips]

You might want to take a look into #coroutines and launch as well as Spring WebFlux

[Alfy]

Thanks

[Alfy]

Looking into webflux

[Szymon Jeziorski]

You should also take a look into kotlinx-coroutines-reactive:
https://github.com/Kotlin/kotlinx.coroutines/tree/master/reactive/kotlinx-coroutines-reactive

With its extensions, you can easily use Webflux in the kotlin coroutines world:

example usage:

fun sampleApiCallThatReturnsMono(): Mono<ApiResponse> {
        ...
    }

    suspend fun webClientWithCoroutineExtension(): ApiResponse =
        client.[...].retrieve().awaitBody()

    suspend fun parallelCalls() = coroutineScope {
        val call1 = async { sampleApiCallThatReturnsMono().awaitSingle() }
        val call2 = async { webClientWithCoroutineExtension() }
        println("Call 1 result: ${call1.await()}, Call 2 result: ${call2.await()}")
    }

    suspend fun multipleFireAndForgetCalls() = coroutineScope { 
        repeat(10) {
            launch { webClientWithCoroutineExtension() }
        }
    }