GoReplay

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Record live HTTP traffic and replay it for shadow testing, load testing, and debugging.

Freemium - Free and open-source core. Commercial GoReplay PRO available with advanced session/keep-alive TCP features and other enterprise capabilities (paid tiers; see website for details).

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About GoReplay

GoReplay is an open-source command-line tool that captures real HTTP(S) traffic from production and replays it against isolated targets to reproduce bugs, perform shadow testing, and run realistic load tests. It supports controlled replay speed, captured request mix preservation, and can validate authentication and session behavior (PRO mode adds TCP session/keep-alive recognition). Installable on servers, it lets teams test with real user patterns to find issues before they reach production.

Key Features

Capture live production HTTP traffic and save requests for later replay
Replay recorded traffic against isolated staging/test services at controlled speeds
Shadow testing to validate new builds against real traffic without impacting users
Load testing with captured request mix and latency/error measurement
PRO TCP session mode: recognize keep-alive TCP sessions and reproduce session behavior

Who is this for?

Backend engineers, QA and SRE teams who need to reproduce production bugs, validate staging builds with real traffic, and perform realistic load tests.

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Freemium

Free and open-source core. Commercial GoReplay PRO available with advanced session/keep-alive TCP features and other enterprise capabilities (paid tiers; see website for details).