ENG-693: Adds fides-client header to logs

[eastandwestwind]

Closes https://ethyca.atlassian.net/browse/ENG-693

Description Of Changes

Adds fides-client header to logs so that we can start to discern traffic from mobile SDK vs web. Default is "unknown" for now, until we start to populate from various clients (mobile, privacy-center, etc)

Follow-up to pass in headers from mobile SDK is here- https://ethyca.atlassian.net/browse/ENG-679

Code Changes

• Update our http log_request middleware to surface fides-client header

Steps to Confirm

1. Start up server
2. Confirm logs contain Fides-Client info, e.g. {'method': 'GET', 'status_code': 200, 'handler_time': '18.218ms', 'path': '/health', 'fides_client': 'unknown'}

Pre-Merge Checklist

• Issue requirements met
• All CI pipelines succeeded
• CHANGELOG.md updated
  • Add a db-migration This indicates that a change includes a database migration label to the entry if your change includes a DB migration
  • Add a high-risk This issue suggests changes that have a high-probability of breaking existing code label to the entry if your change includes a high-risk change (i.e. potential for performance impact or unexpected regression) that should be flagged
  • Updates unreleased work already in Changelog, no new entry necessary
• Followup issues:
  • Followup issues created
  • No followup issues
• Database migrations:
  • Ensure that your downrev is up to date with the latest revision on main
  • Ensure that your downgrade() migration is correct and works
    • If a downgrade migration is not possible for this change, please call this out in the PR description!
  • No migrations
• Documentation:
  • Documentation complete, PR opened in fidesdocs
  • Documentation issue created in fidesdocs
  • If there are any new client scopes created as part of the pull request, remember to update public-facing documentation that references our scope registry
  • No documentation updates required

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
fides-plus-nightly	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jun 5, 2025 9:58am

1 Skipped Deployment

Name	Status	Preview	Comments	Updated (UTC)
fides-privacy-center	⬜️ Ignored (Inspect)			Jun 5, 2025 9:58am

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 87.07%. Comparing base (ddbde7b) to head (e0b71ec).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6195   +/-   ##
=======================================
  Coverage   87.07%   87.07%           
=======================================
  Files         423      423           
  Lines       26321    26321           
  Branches     2870     2870           
=======================================
+ Hits        22919    22920    +1     
  Misses       2776     2776           
+ Partials      626      625    -1     

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[cypress]

fides    Run #12965

Run Properties:   Passed #12965  •  b77c4f6cb7: ENG-693: Adds fides-client header to logs (#6195)

Project	fides
Branch Review	main
Run status	Passed #12965
Run duration	00m 53s
Commit	b77c4f6cb7: ENG-693: Adds fides-client header to logs (#6195)
Committer	Catherine Smith
View all properties for this run ↗︎

---

Test results
Failures	0
Flaky	0
Pending	0
Skipped	0
Passing	5
View all changes introduced in this branch ↗︎