Main Proxy

To check the quality of a proxy server, you can use one of the proxy checkers. There are a lot of them on the Internet. For example, hidemy.name. On the page of the checker you need to specify the IP-address and port of the required proxy server.

The proxy domain most often refers to the IP address where the server is located. It can only "learn" the IP address of the user when processing the traffic. But in most cases it does not store such information later for security reasons.

Spring and Selenium are separate technologies with distinct purposes. Spring is a Java-based framework for building enterprise applications, while Selenium is a tool for automating web browsers for testing web applications.

Spring itself does not block System.in, and it is unlikely that Selenium would block System.in either, as Selenium primarily interacts with web browsers.

However, if your application uses Spring and Selenium together, it's possible that the combination of the two could block System.in under specific circumstances, such as when the application is running in an embedded server mode or if the test suite is running in a headless environment without a proper console.

To avoid blocking System.in, ensure that your application or test suite is configured to run in an environment that supports console input and output. If you're using an embedded server or a headless environment, you may need to use alternative logging mechanisms or debugging tools to interact with your application.

The purpose of User Datagram Protocol (UDP) is to provide a simple and lightweight transport layer protocol for applications that do not require the reliability and overhead of the Transmission Control Protocol (TCP). UDP does not guarantee delivery, meaning it does not provide mechanisms for retransmission or acknowledgment of received packets. However, it offers fast and efficient communication, which is ideal for real-time applications such as video streaming, online gaming, and voice over IP (VoIP). These applications can tolerate some packet loss or delay and prioritize speed over reliability.

There are special online services that use IP and HTTP connection tags to determine if a proxy is being used from your equipment. The most popular are Proxy Checker, Socproxy.