Hey folks! We’re trying to log the request payload...

# ktor

[Constantin Muraru]

Hey folks! We’re trying to log the request payload (using CallLogging and DoubleReceive):

install(DoubleReceive)

install(CallLogging) {
    level = <http://Level.INFO|Level.INFO>
    format { callFormatterAsCurlCommand(it) }
}

fun callFormatterAsCurlCommand(call: ApplicationCall): String {
    val payload = runBlocking { call.receiveText() }
    return payload
}

However, we receive the Request body has been already consumed error, which is rather unexpected. Furthermore, the error is thrown by the DoubleReceive.kt class itself.

The docs even say:

All the receive methods consume the whole payload sent by the client so an attempt to receive a request body twice will lead to RequestAlreadyConsumedException error unless you have DoubleReceive feature installed.

https://ktor.io/servers/calls/requests.html#receiving-several-times

Exception:

io.ktor.request.RequestAlreadyConsumedException: Request body has been already consumed (received).
	at io.ktor.features.DoubleReceive$Feature$install$1.invokeSuspend(DoubleReceive.kt:93) ~[ktor-server-core-jvm-1.4.0.jar:1.4.0]
	at io.ktor.features.DoubleReceive$Feature$install$1.invoke(DoubleReceive.kt) ~[ktor-server-core-jvm-1.4.0.jar:1.4.0]
	at io.ktor.util.pipeline.SuspendFunctionGun.loop(PipelineContext.kt:323) ~[ktor-utils-jvm-1.4.0.jar:1.4.0]

Any tips gladly appreciated.

[Tobias Marschall]

You need to set receiveEntireContent to true.

install(DoubleReceive) {
    receiveEntireContent = true
}

That solved the problem for me. However, any hints from a ktor-developer would be greatly appreciated.