This Go program demonstrates the implementation of a reverse proxy server using the net/http package. The reverse proxy modifies both incoming requests and outgoing responses, specifically replacing occurrences of "demo.miniorange" with "example" in the request headers, response headers, and response body.

The transport type is a custom implementation of the http.RoundTripper interface. It is responsible for modifying both requests and responses.

• RoundTrip: This method intercepts the HTTP request, modifies its host and performs the actual round trip. It then processes the response, replacing relevant information.

The main function initializes the reverse proxy and sets up a simple HTTP server.

• Target URL Parsing: The target URL (https://demo.miniorange.com) is parsed using url.Parse.

• Reverse Proxy Configuration:

  • A reverse proxy is created using httputil.NewSingleHostReverseProxy with a custom transport.
  • The Director function is set to modify the request before it is sent.

• HTTP Server Configuration:

  • Requests for the root path ("/") are handled by the reverse proxy.
  • The server listens on port 443 with TLS using http.ListenAndServeTLS.

The server is configured to listen on port 443 with TLS, and TLS certificates are provided (example.com.crt and example.com.key).

To run the code, ensure that the necessary dependencies are installed, and then execute the following:

go run main.go