Expose response headers in `DocsService`

[hyunw9]

Motivation

This PR addresses issue : #6187

“A response body is exposed in DocService but response headers are not. Since some APIs convey important information through response headers, exposing them in the debug console would be useful.”

Modifications

• Modified the transport to return response headers along with the body when a request is made from the DocService’s debug console.

• Updated the UI to display response headers in addition to the response body.

• Changed the tooltip of the “Copy” button to say “Copy response body” for better clarity.

• Improved API switching behavior in the debug UI

  • When the user navigates to another API and then returns to the previous one, the last debug response (body + headers) is now restored from the internal cache.

• Screenshots

1. Response Section

Before	After

2. Copy Response Button

Before	After

3. Improved API switching behavior

Before : When we click on another API in Docs, the existing response remains. After : When we click on another API, the response value of the previous API remains on the previous page.

Before	After

Result

• Developers can now inspect both the response headers and response body for any API directly within the DocService debug console.

[github-actions[bot]]

🔍 Build Scan® (commit: d1ac966338f108aa8647b9971696cc2bcfb8f20b)

Job name	Status	Build Scan®
build-ubicloud-standard-16-jdk-8	✅	https://ge.armeria.dev/s/dxrw45ox2axkm
build-ubicloud-standard-16-jdk-21-snapshot-blockhound	✅	https://ge.armeria.dev/s/256ji52wuayrc
build-ubicloud-standard-16-jdk-17-min-java-17-coverage	✅	https://ge.armeria.dev/s/egchrdzcpl7to
build-ubicloud-standard-16-jdk-17-min-java-11	✅	https://ge.armeria.dev/s/kua3s3o6u7f4i
build-ubicloud-standard-16-jdk-17-leak	✅	https://ge.armeria.dev/s/d5b74eeetmxxo
build-ubicloud-standard-16-jdk-11	✅	https://ge.armeria.dev/s/l4ekfszfb2oy6
build-macos-latest-jdk-21	✅	https://ge.armeria.dev/s/4marghbthqxjq

[trustin]

Would you mind share the screenshot or screencast that demonstrates the change for easier reviews?

[hyunw9]

Would you mind share the screenshot or screencast that demonstrates the change for easier reviews?

Sure! I've just added a screenshot to make it easier to understand.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 74.60%. Comparing base (8150425) to head (add4c40). Report is 61 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #6191      +/-   ##
============================================
+ Coverage     74.46%   74.60%   +0.14%     
- Complexity    22234    22470     +236     
============================================
  Files          1963     1972       +9     
  Lines         82437    82992     +555     
  Branches      10764    10798      +34     
============================================
+ Hits          61385    61915     +530     
- Misses        15918    15931      +13     
- Partials       5134     5146      +12     

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