We're finding that slow HTTP POSTs into Ktor can b...

# ktor

[Matt]

We're finding that slow HTTP POSTs into Ktor can block the server from responding to other connections until that request completes. Is that expected?

[Robert Jaros]

You should not block the thread in the request processing code.

[Robert Jaros]

Use withContext(<http://Dispatchers.IO|Dispatchers.IO>) if your code is blocking.

[Matt]

It blocks in Ktor code, e.g.:

post("/login") {
            val credentials = call.receive<Credentials>()
            call.respond(credentials)
        }

[Robert Jaros]

Any idea why this POST request is slow?

[Matt]

We encounter it in our live web app, we haven't figured out exactly why it happens there, but we've can reproduce with slow POSTs manually with telnet

[Robert Jaros]

From what I understand it looks like a bug. Try filling an issue with ktor.

[Matt]

👍 I've raised https://github.com/ktorio/ktor/issues/1001