claude-code sends Accept-Encoding: gzip, deflate, br on every
request. api.anthropic.com honors it and returns gzip-compressed
SSE responses. Pipelock 2.3.0 has no decompression path; its
response scanner fails closed with "blocked: compressed
sse_stream response cannot be scanned" — and that gate fires
even with response_scanning.enabled=false and sse_streaming
disabled. Verified empirically against the real pipelock image.
Cleanest fix that preserves DLP coverage end-to-end: have
cred-proxy ask upstream for uncompressed bytes. Strip the
agent's Accept-Encoding when building the upstream headers and
inject `Accept-Encoding: identity`. Upstream returns plaintext;
pipelock can scan; no 403.
Bandwidth cost is the gzip ratio one-way (cred-proxy ↔ upstream
through pipelock). For LLM SSE streams that's a few KB extra per
turn — trivial compared to the alternative of leaving
pipelock's response scanner blind.
didericis
77a51702fc