removed requests as required dependency

[tom-pytel]

Fix apache/skywalking#7282 due to #125

[tom-pytel]

So if you have nothing against it I will look into replacing requests with standard python lib urllib to do the connections?

[wu-sheng]

Do we need

[wu-sheng]

FYI @potiuk This has been reverted and kept optional only.

[tom-pytel]

Do we need

A different communication method? If requests is license problematic then why not change to standard python lib if possible, one less dependency too.

[wu-sheng]

Do we need

A different communication method? If requests is license problematic then why not change to standard python lib if possible, one less dependency too. psf/requests#5797. We just need their new release.

Sorry, it was a copy/paste issue. There is no issue. This dependency issue should be resolved from the upstream repo already.

[tom-pytel]

Heads up, I just grabbed the latest master which should have this and #127 merged and this change is not present. setup.py still contains requests as a required dependency. Guessing merge with @127 list it?

[kezhenxu94]

Hey, I can see requests is not required dependency. https://github.com/apache/skywalking-python/blob/master/setup.py It’s in http extra dependency.

Sorry, you are right, mixup on my part.

[potiuk]

Correct. I mentioned that in my report. So this is right, it's not necesssary according to the ASF Policy (similarly in Airflow we have a lot of extras with requests) - the "optional" LGPL dependency is acceptable. But once the new version is out, I think it would be great to make it "minimal" version of requests - this way the LGPL dependency becomes optional even for optional dependencies ;)