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kotlinlang

Ktor Server: How do I read the body of a PartData?

```post {
  val part = call.receiveMultipart().asFlow().single()
  require(part is PartData.FileItem)
  val bytes = ByteArray(part.headers[ContentLength]!!.toInt())
  try {
    part.provider().readFully(bytes)
  } finally {
    part.dispose()
  }
}```
I always get an closed `ByteReadChannel`.

Okay, found the issue: you should not call `asFlow().single()` because the body of the PartData is already closed. IMHO in that case you should not expose `asFlow()`, and `PartData` should be `AutoCloseable`

Alternative could be renamed to `consumeAsFlow`.

There already is a `forEachPart` but exposing a `Flow` could be questioned. Or add a warning that the body is only available inside the flow, because the flow terminates when `readPart()` returns null and `readPart()` returns null when the request is fully consumed...

This api has bitten me too in the past. There is something unexpected about it