internal/web/proxy: handle unsupported HTTP method

[nalves599]

Details

Handles unsupported HTTP method errors.

Checklist

• [] Local tests pass (ak test authentik/)
• [] The code has been formatted (make lint-fix)

If an API change has been made

• The API schema and clients have been updated (make gen)

If changes to the frontend have been made

• The code has been formatted (make web)

If applicable

• The documentation has been updated
• The documentation has been formatted (make docs)

[netlify]

✅ Deploy Preview for authentik-docs ready!

Name	Link
🔨 Latest commit	968c885
🔍 Latest deploy log	https://app.netlify.com/projects/authentik-docs/deploys/6a0d9451f7a1800008915c65
😎 Deploy Preview	https://deploy-preview-22498--authentik-docs.netlify.app
📱 Preview on mobile	Toggle QR Code... Use your smartphone camera to open QR code link.

---

To edit notification comments on pull requests, go to your Netlify project configuration.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.23%. Comparing base (e331567) to head (fdb968a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #22498      +/-   ##
==========================================
- Coverage   93.28%   93.23%   -0.06%     
==========================================
  Files        1032     1032              
  Lines       60063    60063              
  Branches      400      400              
==========================================
- Hits        56031    55997      -34     
- Misses       4032     4066      +34     

Flag	Coverage Δ
conformance	36.61% <ø> (ø)
e2e	41.31% <ø> (-0.37%)	⬇️
integration	32.56% <ø> (-0.50%)	⬇️
rust	0.00% <ø> (ø)
unit	92.20% <ø> (+<0.01%)	⬆️
unit-migrate	92.25% <ø> (+<0.01%)	⬆️

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.