HTTP / HTTPS / SOCKS5 / WebSocket / Replay

Bifrost

A proxy workbench for capturing traffic, rewriting requests, replaying failures, and debugging real applications from the terminal, desktop, or browser.

Install Read Docs

$ bifrost start --no-system-proxy

Admin UI ready at http://127.0.0.1:8800/_bifrost/

$ bifrost traffic search --include headers,body api.example.com

24 matching requests · latest 200 OK · replay available

api.example.com reqHeaders://x-debug=1
api.example.com resDelay://350
api.example.com replay://last-success
*.internal.test passthrough://true

Capture Rewrite Replay TLS MITM Scripts Desktop

Workflow

One proxy, several honest debugging paths.

Capture the real request

Inspect headers, bodies, cookies, streaming messages, and the listener port that saw it.

Rewrite without rebuilding

Patch headers, bodies, URLs, status codes, latency, and routing with local rules.

Replay the failure

Turn a captured request into a repeatable curl, HAR, or replay run while you iterate.

Automate the edge cases

Use scripts and values when static rules are not enough for the flow you are chasing.

Start

From zero to inspected traffic in four steps.

01 Install the CLI 02 Start without touching system proxy 03 Add a rule for one target 04 Replay and compare