[wcornell]

Generated REST stubs previously constructed request URI paths with absl::StrCat, without percent-encoding path parameters or validating against . / .. traversal segments, unexpected / characters in single-segment fields, or malformed UTF-8.

• Update internal::UrlEncode to strictly follow the RFC 3986 Section 2.3 unreserved character set
• Add rest_internal::EncodePath / rest_internal::PathPiece to validate and encode single-segment, multi-segment (=**), and custom-verb (:verb) path components (returning StatusCode::kInvalidArgument on invalid inputs)
• Update the generator and Discovery proto converter to emit EncodePath across all generated REST stubs.

The first commit contains all library, generator, golden, and test changes; the second commit contains only the regenerated Discovery .proto and *_rest_stub.cc files.

[gemini-code-assist]

Code Review

This pull request refactors REST path construction across generated stubs by replacing absl::StrCat with rest_internal::EncodePath and rest_internal::PathPiece. This change ensures that path segments are safely encoded and validated, rejecting invalid segments containing . or .. with an argument error. The generator, along with its unit and integration tests, has been updated to support and verify this new path encoding behavior. I have no further feedback to provide as there are no review comments to assess.

[codecov]

Codecov Report

❌ Patch coverage is 98.46939% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 92.43%. Comparing base (bca2305) to head (d1cbe43).

Files with missing lines	Patch %	Lines
...n_tests/golden/v1/internal/deprecated_rest_stub.cc	0.00%	3 Missing ⚠️
...s/golden/v1/internal/golden_rest_only_rest_stub.cc	0.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #16580      +/-   ##
==========================================
+ Coverage   92.39%   92.43%   +0.03%     
==========================================
  Files        2266     2266              
  Lines      219636   220104     +468     
==========================================
+ Hits       202938   203447     +509     
+ Misses      16698    16657      -41     

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