[PR #10074/f733258e backport][3.12] Support absolute url to override base url

[patchback]

This is a backport of PR #10074 as merged into master (f733258).

What do these changes do?

Support absolute url in request to override base url in session.

session = ClientSession(base_url="http://example.com/foo/")

await session.request("GET", "http://abc.com/bar/")

Are there changes in behavior for the user?

Yes

Is it a substantial burden for the maintainers to support this?

No

Related issue number

Fixes #10027

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
  • The format is <Name> <Surname>.
  • Please keep alphabetical order, the file is sorted by names.
• Add a new news fragment into the CHANGES/ folder

  • name it <issue_or_pr_num>.<type>.rst (e.g. 588.bugfix.rst)

  • if you don't have an issue number, change it to the pull request
    number after creating the PR

    • .bugfix: A bug fix for something the maintainers deemed an
      improper undesired behavior that got corrected to match
      pre-agreed expectations.
    • .feature: A new behavior, public APIs. That sort of stuff.
    • .deprecation: A declaration of future API removals and breaking
      changes in behavior.
    • .breaking: When something public is removed in a breaking way.
      Could be deprecated in an earlier release.
    • .doc: Notable updates to the documentation structure or build
      process.
    • .packaging: Notes for downstreams about unobvious side effects
      and tooling. Changes in the test invocation considerations and
      runtime assumptions.
    • .contrib: Stuff that affects the contributor experience. e.g.
      Running tests, building the docs, setting up the development
      environment.
    • .misc: Changes that are hard to assign to any of the above
      categories.

  • Make sure to use full sentences with correct case and punctuation,
    for example:

    Fixed issue with non-ascii contents in doctest text files
    -- by :user:`contributor-gh-handle`.

    Use the past tense or the present tense a non-imperative mood,
    referring to what's changed compared to the last released version
    of this project.

[codspeed-hq]

CodSpeed Performance Report

Merging #10094 will not alter performance

_{Comparing patchback/backports/3.12/f733258ed9e5e71b7b97511f5654efd6799cac46/pr-10074 (ffe7c27) with 3.12 (6865d6b)}

Summary

✅ 44 untouched benchmarks

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.06%. Comparing base (6865d6b) to head (ffe7c27).
Report is 193 commits behind head on 3.12.

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             3.12   #10094      +/-   ##
==========================================
- Coverage   98.06%   98.06%   -0.01%     
==========================================
  Files         122      122              
  Lines       37052    37051       -1     
  Branches     4453     4453              
==========================================
- Hits        36335    36334       -1     
  Misses        540      540              
  Partials      177      177              

Flag	Coverage Δ
CI-GHA	97.95% <100.00%> (-0.01%)	⬇️
OS-Linux	97.66% <100.00%> (-0.01%)	⬇️
OS-Windows	94.57% <ø> (ø)
OS-macOS	96.77% <100.00%> (-0.01%)	⬇️
Py-3.10.11	96.63% <100.00%> (+<0.01%)	⬆️
Py-3.10.15	97.22% <100.00%> (-0.01%)	⬇️
Py-3.11.10	97.23% <100.00%> (-0.01%)	⬇️
Py-3.11.9	96.70% <100.00%> (-0.02%)	⬇️
Py-3.12.7	97.72% <100.00%> (-0.01%)	⬇️
Py-3.13.0	97.71% <100.00%> (-0.01%)	⬇️
Py-3.9.13	96.56% <100.00%> (+<0.01%)	⬆️
Py-3.9.20	97.14% <100.00%> (+<0.01%)	⬆️
Py-pypy7.3.16	96.70% <100.00%> (-0.01%)	⬇️
VM-macos	96.77% <100.00%> (-0.01%)	⬇️
VM-ubuntu	97.66% <100.00%> (-0.01%)	⬇️
VM-windows	94.57% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.