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intercept: fix replace_status being silently dropped (#7810)
* test: add failing tests for intercept replace_status (#7805)

Add integration tests that verify replace_status actually substitutes
the HTTP status code sent to the client. Currently these tests fail
because replace_status is silently a no-op due to value-receiver
boxing and shouldBuffer returning false.

Tests added:
- TestInterceptReplaceStatusWithMatcher: 500 -> 200 with @err matcher
- TestInterceptReplaceStatusWithoutMatcher: 403 -> 200 unconditionally
- TestInterceptReplaceStatusNotMatched: 200 passes through unchanged

* fix: make intercept replace_status actually substitute the status code

Fix #7805: replace_status was silently a no-op because:
1. shouldBuffer returned false when a replacement status was set,
   causing the original status to be streamed directly to the wire
2. The value-receiver WriteHeader method operated on a stale copy

The fix:
- shouldBuffer now returns true when replace_status matches, so
  the response is buffered instead of streamed
- After next.ServeHTTP returns, if routes are nil (replace_status
  only), write the substituted status and buffered body to the client

The interceptedResponseHandler.WriteHeader substitution branch is no
longer needed for this path since substitution happens post-ServeHTTP.

* refactor: remove dead WriteHeader method and resolved TODO

The value-receiver WriteHeader on interceptedResponseHandler was
unreachable dead code — the substitution is now handled post-ServeHTTP
via buffering. Remove it along with the TODO comment that noted
status code replacement was unfinished.

* style: apply nit suggestions from dunglas code review

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>
2026-06-12 15:50:58 -06:00
..
caddyevents refactor: replace HasPrefix+TrimPrefix with CutPrefix (#7095) 2025-06-27 22:04:09 +03:00
caddyfs events: Refactor; move Event into core, so core can emit events (#6930) 2025-03-29 08:15:43 -06:00
caddyhttp intercept: fix replace_status being silently dropped (#7810) 2026-06-12 15:50:58 -06:00
caddypki tls: Add tls_resolvers global option for DNS challenge configuration (#7297) 2026-03-01 15:32:04 -05:00
caddytls caddytls: skip idna.ToASCII for pure ASCII SNI values (#7770) 2026-05-28 11:18:09 +10:00
filestorage caddyfile: Normalize & flatten all unmarshalers (#6037) 2024-01-23 19:36:59 -05:00
internal/network core: add modular network_proxy support (#6399) 2025-03-21 17:06:15 +00:00
logging chore: clean up wording and typo fixes (#7745) 2026-05-20 16:36:30 +10:00
metrics metrics: scope metrics to active config, add optional per-host metrics (#6531) 2024-10-02 08:23:26 -06:00
standard filesystem: Globally declared filesystems, fs directive (#5833) 2024-01-13 20:12:43 +00:00