Hello! How can i read request body in MockEngine handler?

You can determine what type of a

OutgoingContent

you’re dealing with to convert it to a

ByteReadChannel

and then read bytes from the channel:

val client = HttpClient(MockEngine) {
    engine {
        addHandler { request ->
            val content: ByteReadChannel = when (val body = request.body) {
                is OutgoingContent.ByteArrayContent -> ByteReadChannel(body.bytes())
                is OutgoingContent.NoContent -> ByteReadChannel.Empty
                is OutgoingContent.ReadChannelContent -> body.readFrom()
                is OutgoingContent.WriteChannelContent -> GlobalScope.writer(coroutineContext, autoFlush = true) {
                    body.writeTo(channel)
                }.channel
                else -> error("Not supported OutgoingContent type")
            }

            // Use content.readRemaining().readText() to read body as String

            respondOk()
        }
    }
}

It worked, thank you! But i dont understand why, i have

WriteChannelContent

, why do i need such complicated and unobvious way to read it?

If you know the type of a

OutgoingContent

in advance then you can just cast

request.body

to that type.

Yeah, i mean, i know that it is WriteChannel, but why do i need GlobalScope.writer etc to read from it?

Because the

WriteChannelContent

can only write data to a

ByteWriteChannel

.

public abstract class WriteChannelContent : OutgoingContent() {
    public abstract suspend fun writeTo(channel: ByteWriteChannel)
}

Ok, thank you