Source: https://wildfly.zulipchat.com/#narrow/channel/196266-wildfly-user/topic/.E2.9C.94.20Wildfly.20unexpectedly.20drop.20connection

We found a strange behavior of Wildfly 33 where it drop connection when `ServletInputStream` wrapped with `java.io.PushbackInputStream` (wrapped by Spring MVC) and request size > 16kB and process longer than 90 seconds.

The strange thing is it only reproducible when all the condition satisfy.

Steps to reproduce this issue:

1. Use a Wildfly 33 build
2. Deploy attached demo.war
3. Access http://localhost:8080/demo/
4. Click Start Sending for each test case, expecting all success but actually the last case fail

The JSP page is just wrapping the `ServletInputStream` with `java.io.PushbackInputStream` and read the request body by `inputStream.readNBytes(request.getContentLength())` (Simulate what Spring MVC does) and `Thread.sleep(...)` to simulate the actual processing time.

Also checked in Wildfly 34, still can be reproduced.