When you rename a protocol, the old one is not selected so we cannot immediately type.

In the CMake documentation section about building deployments, the documentation references the command make check, which I cannot find the final CMake build. Perhaps it's a remnant from the past?

• Since we are purely Python 3, it would be convenient and nice to have typing information at least in the interfaces which are publicly exposed.
• Add mypy to test-requirements.txt and add static type checks to Travis CI builds.

We should have the ability to share examples a la jsFiddle. There are some examples that I would like to share with my students without having to recreate them each time.

The puzzle 23-e7afac42 from #23 has to be resolved:

https://github.com/yegor256/cactoos-http/blob/31af9eaed81d7a6f25c223d10e36fdafd854d06e/src/main/java/org/cactoos/http/HtUpgradeWire.java#L32-L45

The puzzle was created by rultor on 30-May-18.

Estimate: 30 minutes,

If you have any technical questions, don't ask me, submit new tickets instead. The task will be "done" when the problem is