This is not a real problem of nginx. I just want to confirm the solution under this case.

My nginx serving as a web reverse proxy, and it also connects to a third server for authentication with the Cookie and token in URI. The authentication server's timeout is 3s. The authentication is handled by my own module.

In a stress test, we make a 200MB fake response from the upstream and start 150 concurrent client. The upstream will send this 200MB response with a 20KB buffer. That's, the servlet will "write" the response each time when the 20KB buffer is full.

After a while, my own module starts to report time out. The log show that the time between the authentication request's sending and read handler is invoked is > 3s.

I want to confirm is:
1. Due to the nginx event model, the long time taken by several requests will make other events think they are "time out", right?
2. What's the best way to resolve this problems? Increase the timeout value?
3. Will enabling nginx multi-threading help in this case?

Many thanks.