How do I get the content of a multipart form data ...

# ktor

[Vampire]

How do I get the content of a multipart form data part?
If I try like in the docs with part.provider().readRemaining().readByteArray() I only get an empty array, while I know for sure that there is content.

[Aleksei Tirman [JB]]

The listed code should work. Can you inspect the response body with a traffic-analyzing tool to determine if the part is empty?

[Vampire]

See the last half-sentence. :-)
I checked with logging call.receiveText().

[Aleksei Tirman [JB]]

Can you share the URL of the endpoint if it's a part of a public service?

[Vampire]

Ah, found the problem, thanks for rubber-ducking. 🙂

[Vampire]

I did

val parts = call
    .receiveMultipart()
    .asFlow()
    .toList()
    .map {
        when (it) {
            is PartData.FileItem -> {
                it.name to it.provider().readRemaining().readText()
            }

            else -> {
                logger.error { "Unexpected part data ${it::class.simpleName}" }
                call.respondText(
                    text = HttpStatusCode.InternalServerError.description,
                    status = HttpStatusCode.InternalServerError,
                )
                return@post
            }
        }
    }
    .associate { it }

for being able to to the return@post.

I need to do the map still in the flow and toList after that, then it works and have to determine after that whether to return@post.