Update proxy_server.js

[Super-Code774]

These improvements enhance security, readability, and maintainability

[saumon-brule]

Hey, thank you for your work but unfortunately, the proxy doesn't really need an upgrade. Actually, it just works and it is only used for the fetch of profile pictures. The reason why we use the proxy instead of EDPU (the extension to bypass ED's fetch restrictions) for this is because we didn´t configure the extension to handle the requests we use to fetch profile pictures). The best improvement that could be done would be to remove the usage of the proxy and update the extension. If you want you can try to do this. 👍

[Super-Code774]

Yes I understand