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Fix #261: [milestone Milestone 2 ] Update on_http_response_headers() in `crates/proxy-wasm-evidence/src/filter.rs... #262

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Fix #261: [milestone Milestone 2 ] Update on_http_response_headers() in `crates/proxy-wasm-evidence/src/filter.rs... #262

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9 changes: 9 additions & 0 deletions crates/proxy-wasm-evidence/src/filter.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -149,6 +149,15 @@ impl HttpContext for EvidenceFilter {
"x-aep-recording-mode",
Some(evidence.recording_mode.as_str()),
);
// Surface MCP 2026-07-28 header leakage detection on the response so
// downstream observers can react without parsing the AEP record body.
// Carries the same snake_case variant name stored on
// `ActionEvidence::mcp_header_risk`; omitted entirely when no risk was
// detected (None clears/omits the header).
self.set_http_response_header(
"x-aep-mcp-header-risk",
evidence.mcp_header_risk.as_deref(),
);
// Increment the appropriate Prometheus counter for this recording mode.
let metric_id = match evidence.recording_mode {
RecordingMode::Validation => self.metric_validation,
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