urllib3-test-env

Overview

This environment was created to reproduce and fix this bug.

There's 2 docker containers:

• upload-server - an instance of simple-upload-server for sending requests to
• urllib3-client - urllib3 environment with slowed egress traffic for running urllib3 code

Reproducing Bug

Requirements:

• docker
• docker-compose

1. After cloning, initialise the environment with:

make init

2. Start the environment with:

docker-compose up

3. In a new shell on the host but it in the root of the repo, run the following to exec into the urllib3-client container:

docker-compose exec urllib3-client bash

4. From the urllib3-client shell run the following script to trigger the bug:

python3 bug-bait.py

If the bug was successfully reproduced then a stacktrace containing the following error should be printed:

urllib3.exceptions.ProtocolError: ('Connection aborted.', TimeoutError('timed out'))

The following output will be immediately before the stack trace

Upload request finished in 5.401 seconds

Which is the timeout of the initial request + some overhead. If the timeout of the initial request is changed, the duration of the above output will change to track with it.

Cleanup

Run docker-compose down to terminate the environment.