This project is a dead simple reverse proxy built in rails.
It allows you to send a request to your own server, which sends a request to a domain of your choice, and returns the response through your server. It gives you a way to modify the response with rack middleware.
Note: This app can only sends requests to 1 domain, which you specify as an environment variable. For more flexibility see the rack-reverse-proxy gem.
Clone the repo, run $ bundle install to install the gems.
Add the PROXY_DOMAIN you want to send requests to. In your development environment, create a .env file in your project folder and add the PROXY_DOMAIN there.
.env file example
PROXY_DOMAIN="https://www.reddit.com"
If you're running the app in production, make sure to set the environment variable, the .env gem is not configured for production.
Run the rails app with $ rails s.
Now http://locahost:3000 will show https://www.reddit.com and all the links will work.
If you need to modify the response, let's say to inject some javascript into the page, you can use the ResponseModifier middleware located in lib/response_modifier.rb.
Changing status, headers, or response will modify the response.
There is a simple example that injects some console.log javascript into the response for the homepage.
- Redirects. The Location header is not modified, so a redirect will redirect you the original domain.
- Absolute links. Relative links work fine, but absolute links do not. Most websites have relative links these days thankfully.