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66 lines
2.6 KiB
Markdown
66 lines
2.6 KiB
Markdown
# Differential Network Capture
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Headroom includes a containerized harness for comparing Claude Code traffic sent
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directly to Anthropic with traffic sent through a Headroom proxy. The harness
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uses mitmproxy in two isolated lanes, writes sanitized JSONL captures, and then
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generates Markdown/JSON reports with request route, header, body size, body hash,
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and JSON payload differences.
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## Run The Harness
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```bash
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cd docker/differential-network-capture
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mkdir -p captures
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export ANTHROPIC_API_KEY=...
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export CLAUDE_PROMPT="Summarize this repository in one sentence."
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docker compose up --build mitm-direct mitm-headroom-upstream headroom-proxy mitm-headroom-client
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docker compose --profile run run --rm claude-direct
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docker compose --profile run run --rm claude-headroom
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```
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The primary captures are written to:
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- `docker/differential-network-capture/captures/direct.jsonl`
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- `docker/differential-network-capture/captures/headroom-client.jsonl`
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The Headroom lane also writes
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`docker/differential-network-capture/captures/headroom-upstream.jsonl`, which is
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the request Headroom forwards to Anthropic after proxy processing.
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By default only `api.anthropic.com` is logged. Override
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`CAPTURE_INCLUDE_HOSTS` with a comma-separated list to include other hosts.
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## Generate A Report
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```bash
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headroom capture network-diff \
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--direct docker/differential-network-capture/captures/direct.jsonl \
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--headroom docker/differential-network-capture/captures/headroom-client.jsonl \
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--output docker/differential-network-capture/captures/report.md \
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--json-output docker/differential-network-capture/captures/report.json
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```
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The report redacts sensitive header values and sensitive query values before
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comparison. Request bodies are captured so structural payload differences can be
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identified; keep the generated `captures/` directory out of commits because it
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may contain prompts, tool outputs, and repository context.
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For Claude Code deferred-tool investigations, the paired exchange table includes
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top-level Anthropic `tools` counts and serialized tool bytes. A jump from
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`tools=0->N` in the Headroom client lane is evidence that Claude Code eagerly
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materialized tool schemas before the request reached Headroom.
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## Custom Claude Invocation
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Set `CLAUDE_COMMAND` to run the exact command under test in both lanes:
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```bash
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CLAUDE_COMMAND='claude -p "read README.md and summarize the proxy setup"' \
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docker compose --profile run run --rm claude-direct
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CLAUDE_COMMAND='claude -p "read README.md and summarize the proxy setup"' \
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docker compose --profile run run --rm claude-headroom
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```
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Use `CLAUDE_DIRECT_ARGS` and `CLAUDE_HEADROOM_ARGS` when each lane needs
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different flags.
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