An error occurred communicating with http://localhost:8080/validate: Failed to parse request body: request body length should be specified, chunked transfer encoding should be used or keep-alive should be disabled (connection: close) CIO client engine running on an Android emulator. Server side is Ktor Netty engine.

Looks like the response was corrupted somehow. There is a known issue that is still not reproduced when headers get corrupted on Android

it works fine running with java, for instance in my unit tests