[styfle]

This relates to...

Follow-up to #5816, which introduced HTTP/2 response Content-Length validation and the unconditional replacement of stream errors.

Rationale

When an HTTP/2 session fails after response headers arrive, the received body can be shorter than its Content-Length. The stream error handler currently replaces the transport failure with UND_ERR_RES_CONTENT_LENGTH_MISMATCH, discarding the original error code, message, and stack.

Changes

• Preserve HTTP/2 session errors and other transport failures instead of converting every incomplete response into a length-mismatch error.
• Limit conversion to Node's HTTP/2 protocol-error paths and attach the original error as cause.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 91.68%. Comparing base (55bf294) to head (b437b46).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6176      +/-   ##
==========================================
+ Coverage   91.67%   91.68%   +0.01%     
==========================================
  Files         113      113              
  Lines       44443    44449       +6     
==========================================
+ Hits        40741    40751      +10     
+ Misses       3702     3698       -4     

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[mcollina]

lgtm