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kotlinlang

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 -&gt;
            val content: ByteReadChannel = when (val body = request.body) {
                is OutgoingContent.ByteArrayContent -&gt; ByteReadChannel(body.bytes())
                is OutgoingContent.NoContent -&gt; ByteReadChannel.Empty
                is OutgoingContent.ReadChannelContent -&gt; body.readFrom()
                is OutgoingContent.WriteChannelContent -&gt; GlobalScope.writer(coroutineContext, autoFlush = true) {
                    body.writeTo(channel)
                }.channel
                else -&gt; 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?

Why extension function .toByteArray() does not work? It just hangs 

Because the `WriteChannelContent` can only write data to a `ByteWriteChannel` .
```public abstract class WriteChannelContent : OutgoingContent() {
    public abstract suspend fun writeTo(channel: ByteWriteChannel)
}```

You can’t directly get a `ByteReadChannel` or a `ByteArray` using this class.