With one click

Intercept & view all Ruby HTTP(S)

Mock endpoints or entire servers

Rewrite, redirect, or inject errors

The Ruby Logo

HTTP Toolkit is a beautiful & open-source tool
for debugging, testing and building with HTTP(S)
on Windows, Linux & Mac.

  1. Open a terminal via HTTP Toolkit
  2. Run any Ruby tool or server from that terminal
  3. Instantly see, debug & rewrite all Ruby's HTTP traffic
  • net::http
  • Faraday
  • REST Client
  • Mechanize
  • Bundler
  • HTTParty
  • Excon
  • open-uri
  • gem install

(and anything else that supports HTTP(S) proxies)


Effortlessly intercept & proxy any HTTP or HTTPS traffic

Search, explore & inspect HTTP requests & responses

One-click setup for Chrome, Node.js, Java, Python & more


Edit live requests & responses, to test your APIs & clients

Simulate HTTP errors, timeouts & failed connections

Validate request performance and debug caching & compression


Mock servers or endpoints for rapid API prototyping

Export ready-to-use requests for curl, fetch & 20 other tools

Automate HTTP using HTTP Toolkit's open-source internals


Capture HTTP(S) with zero setup

Automatic setup for targeted interception of HTTP & HTTPS from most clients, including:

For platforms without automatic setup, HTTP Toolkit can be used as an HTTP(S) proxy, compatible with HTTP requests from any language or tool.

HTTP interception for Chrome, Firefox, CLI tools, Docker, Edge, Android and more


Explore, search & examine HTTP

Skim through traffic with highlighting by content type, status & source, or use powerful filtering tools to precisely match the messages that matter to you.

Examine the URL, status, headers & body of each request or response, with inline explanations & docs from MDN.

Dig into message bodies with highlighting & autoformatting for JSON, HTML, JS, hex and others, all using the power of Monaco, the editor from Visual Studio Code.

Inspecting HTTP requests with HTTP Toolkit


Pause & edit live HTTP traffic

Precisely match requests, jump to them when they appear, and edit anything: the target URL, method, headers or body.

Manually respond directly to requests as they arrive, or pass them upstream, and pause & edit the real response on the way back.

Step through HTTP traffic request by request, or manually mock endpoints and errors.

HTTP debugging with breakpoints on live traffic


Test with fully automated mock responses Pro

Create rules to match requests and respond with your own content, to quickly prototype against new endpoints or services.

Define new endpoints, override existing ones, or replace external services, to reproduce tricky edge cases and test your error handling.

Import & export your mock rulesets, to build complex setups and share them with your team.

Build HTTP mock rules in just a few clicks


Rewrite anything

Inject request timeouts, simulate connection failures, and silently redirect requests from one server to another.Pro

Precise matching lets you target the requests you care about. Match any requests sent anywhere by using HTTP Toolkit as a proxy, send requests directly to use it as a mock server.

Match and rewrite HTTP with custom rules

And there's more to come too!

Future plans include security analysis & metrics, session-wide performance graphs & analysis, HTTP client tooling, Docker integration & more...

Sound good? ,
or download now below.

Try it for yourself

100% open-source
Dive in at github.com/httptoolkit
Picture of Tim PerryBuilt in Barcelona
by Tim Perry