Simple proxy server that logs headers of all HTTP requests it forwards. It has been developed in Java using Spring Framework and includes unit testing with JUnit 5 and Mockito.
- The proxy server receives the desired URL server through a query parameter called url
- It checks if the received URL is valid (protocol is optional)
- It performs a request to the proxied server and if the server response status code is 200, it logs the headers
- It redirects to the proxied server with a redirection status code
Clone the repository to your local machine. Open the project in an IDE that supports Java projects and make sure you have JDK 11. Run the application.
Clone the repository to your local machine. Open your command-line interface, navigate to "~out\jar" folder and run "java -jar proxy-server.jar"
- Choose any website to visit, e.g.
- Go to your browser and type localhost:8080?url=<website_you_want_to_visit>, e.g.
localhost:8080?url=https://www.youtube.com
- You will be redirected to the website you chose
- If you chose the first option, you will see headers' information in your IDE console. If you chose the second option, you will see it in the command-line interface.
- Remember https://www.youtube.com, http://www.youtube.com, www.youtube.com and youtube.com are equally valid and will redirect you to the same website.
- Browsers may save the server response redirection in cache, so you might see logs are not printing if you point to the same URL
If the request cannot be proxied to the requested URL, one of the following exceptions will appear on your browser:
| HTTP Status | Code | Exception | Description |
|---|---|---|---|
| 400 | 001 | MissingURLException | URL is missing on the request |
| 400 | 002 | InvalidURLException | Given URL couldn't be parsed to a valid URL |
| 409 | 003 | ProxiedServerErrorException | Proxied server doesn't exist or is currently unavailable |
