LLHTTP
------
When building aiohttp from source, there is a pure Python parser used by default.
For better performance, you may want to build the higher performance C parser.
To build this ``llhttp`` parser, first get/update the submodules (to update to a
newer release, add ``--remote``)::
git submodule update --init --recursive
Then build ``llhttp``::
cd vendor/llhttp/
npm ci
make
Then build our parser::
cd -
make cythonize
Then you can build or install it with ``python -m build`` or ``pip install -e .``
