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A request/response rewriting HTTP proxy. A Rack app.
Ruby

README.md

A request/response rewriting HTTP proxy. A Rack app. Subclass Rack::Proxy and provide your rewrite_env and rewrite_response methods.

Example

class Foo < Rack::Proxy

  def rewrite_env(env)
    env["HTTP_HOST"] = "example.com"

    env
  end

  def rewrite_response(triplet)
    status, headers, body = triplet

    headers["X-Foo"] = "Bar"

    triplet
  end

end

Disable SSL session verification when proxying a server with e.g. self-signed SSL certs

class TrustingProxy < Rack::Proxy

  def rewrite_env(env)
    env["rack.ssl_verify_none"] = true

    env
  end

end

The same can be achieved for all requests going through the Rack::Proxy instance by using

Rack::Proxy.new(ssl_verify_none: true)

Using it as a middleware:

Example: Proxying only requests that end with ".php" could be done like this:

require 'rack/proxy'
class RackPhpProxy < Rack::Proxy

  def perform_request(env)
    request = Rack::Request.new(env)
    if request.path =~ %r{\.php}
      env["HTTP_HOST"] = "localhost"
      env["REQUEST_PATH"] = "/php/#{request.fullpath}"
      super(env)
    else
      @app.call(env)
    end
  end
end

To use the middleware, please consider the following:

1) For Rails we could add a configuration in config/application.rb

  config.middleware.use RackPhpProxy, {ssl_verify_none: true}

2) For Sinatra or any Rack-based application:

class MyAwesomeSinatra < Sinatra::Base
   use  RackPhpProxy, {ssl_verify_none: true}
end

This will allow to run the other requests through the application and only proxy the requests that match the condition from the middleware.

See tests for more examples.

WARNING

Doesn't work with fakeweb/webmock. Both libraries monkey-patch net/http code.

Todos

  • Make the docs up to date with the current use case for this code: everything except streaming which involved a rather ugly monkey patch and only worked in 1.8, but does not work now.
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