Unsupported HTTP method: PRI

Illegal request, responding with status '501 Not Implemented': Unsupported HTTP method: PRI

This indicates that an HTTP/2 request was received, but the server was not correctly set up to handle those. You may have to:

• Make sure the akka.http.server.enable-http2 option is enabled
• Make sure you are running at least JDK version 8u252
• Make sure you are not using Http().bindAndHandle()Http().bindAndHandle() or Http().newServerAt().bindFlow()Http().newServerAt().bindFlow(), but Http().newServerAt().bind()Http().newServerAt().bind().