A slow HTTP post can block the server from processing requests

[mattrussell-sonocent]

Ktor Version

1.1.3

Ktor Engine Used(client or server and name)

Netty

JVM Version, Operating System and Relevant Context

Java 1.8.0_172, OSX / Linux

Feedback

Given the following server using Jackson content negotiation: https://gist.github.com/mattrussell-sonocent/faa63a417fd3b3f7424de93d4a5e7d1f

We're finding that slow client POSTs can block other requests from being processed. For example, if we telnet localhost 8080 and begin a request:

POST /login HTTP/1.1
Content-Length: 6500
Content-Type: application/json

{

Then attempt wget http://localhost:8080/, the server doesn't respond until the telnet POST session is completed or terminated. (On a dev Macbook, I had to send ~8 GET requests to start seeing this behaviour. In a container environment, it happened on the first request.)

[oleg-larshin]

Please check the following ticket on YouTrack for follow-ups to this issue. GitHub issues will be closed in the coming weeks.

[Stexxe]

Cannot reproduce with Ktor 1.6.1.