Proxy IP Checker (Simulation)

In a real-world scenario, testing proxies entirely on the client-side (in the browser) is not possible due to several limitations:

• Same-Origin Policy: Browsers restrict web pages from making requests to a different domain than the one serving the web page. This is a security measure to prevent cross-site scripting attacks.
• CORS (Cross-Origin Resource Sharing): While CORS can allow some cross-origin requests, it requires server-side configuration and doesn't support proxy protocols like SOCKS5.
• Protocol Limitations: Browsers don't natively support SOCKS5 or HTTP proxy protocols for general web requests initiated by JavaScript.
• Security Concerns: Allowing direct proxy connections from the browser could pose significant security risks.

To implement a real proxy checker, you would typically need:

• A server-side component to handle the actual proxy connections and tests.
• An API that the front-end can call to initiate tests and receive results.
• Proper security measures to prevent abuse of the testing service.

This simulation demonstrates the user interface and flow of a proxy checker but does not perform actual proxy testing. For a production-ready proxy checker, server-side implementation is necessary.