Added Link header (RFC8288) parsing

[hdk5]

What do these changes do?

Added and links property for ClientResponse object.

links parses Link header into a dict.
Dict keys are rel link params or url itself as string.
Values are dicts of link params and url as yarl URL object

Look also RFC 8288

Are there changes in behavior for the user?

New properties added, no backward incompatible changes

Related issue number

#2948

Checklist

• I think the code is well written
• Unit tests for the changes exist
• Documentation reflects the changes
• If you provide code modification, please add yourself to CONTRIBUTORS.txt
• Add a new news fragment into the CHANGES folder

[codecov-io]

Codecov Report

Merging #2955 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2955      +/-   ##
==========================================
+ Coverage   97.99%   97.99%   +<.01%     
==========================================
  Files          40       40              
  Lines        7523     7539      +16     
  Branches     1318     1321       +3     
==========================================
+ Hits         7372     7388      +16     
  Misses         48       48              
  Partials      103      103

Impacted Files	Coverage Δ
aiohttp/client_reqrep.py	97.35% <100%> (+0.07%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update bc36b8c...6066206. Read the comment docs.

[asvetlov]

1. No need for raw_links, use MultiDict for links instead.
2. Use immutable MappingProxyType as .links item value.
3. Add a test for quoted attr, e.g. Link: <http://example.com>; rel="rel-type", it is a valid case.

[asvetlov]

By spec the link could be relative (/path/to), need to join with base in this case.

[asvetlov]

Thanks!

[daniel-j-h]

Sweet that was fast, thanks @hdk5! 🙇

[lock]

This thread has been automatically locked since there has not been any recent activity after it was closed. Please open a [new issue] for related bugs.
If you feel like there's important points made in this discussion, please include those exceprts into that [new issue].
[new issue]: https://github.com/aio-libs/aiohttp/issues/new