urequests module for MicroPython
micropython-lib currently offers 4 HTTP client modules:
This README is intended to describe differences among them and help to choose the right module for a particular use.
- urllib.urequest implements a subset of API CPython standard library module urllib.request. This module is intended to be the most minimal of all three and provide an efficient, stream-based API. It doesn’t support automatic redirects or chunked transfer encoding.
- urequests implements a subset of API of the popular 3rd-party package requests. requests brags itself as “HTTP for Humans”, which means that its API is not ideal, and implementation is inefficient. urequests implements only a subset of it, and tries to mend some poor defaults of the prototype module. Still, it’s less efficient than urllib.urequest. Redirects are handled, but not chunked transfer encoding.
- uurequests is capture of the version 0.8 of urequests, before opening the door for adding more features to the latter. It’s provided for very small systems which still would like requests-like API.
- uaiohttpclient is an HTTP client for uasyncio module. It’s the only of all 3 which supports chunked transfer encoding.
Thus, the selection guide:
- Whenever possible, use urllib.urequest.
- If you write a once-off, throw-away app where you don’t care about efficiency, you can use urequests.
- If you wrote that for very small system and above didn’t work, can give uurequests a try.
- If you devel an async app, use uaiohttpclient.
- If you need support for more HTTP protocol features, use uaiohttpclient and write an async app.
Future of the modules:
- urllib.urequest is intended to stay minimal and unlikely will get more features (it’s suitable for ~80% of possible usage scenarios).
- urequests has bloat in its DNA, so likely will slowly grow more features to match the upstream module, which will make it even less suitable for low-memory targets.
- uurequests was snapshotted to address concern of such low-memory systems support. It’s static, and only critical bugfixes are intended to be applied.
- uaiohttpclient may get updated as needed.
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