Explain the process, starting from sending the request and ending with receiving the token

The initialization blocks in Java are code blocks that execute when an instance of a class is created or when the class is loaded.

There are two types:

1. Static initialization blocks (static { ... }) — executed once when the class is loaded into memory. Used for initializing static variables or running code that should execute before any objects are created.

2. Instance initialization blocks ({ ... }) — executed each time a new object is created, before the constructor. They allow common initialization code for all constructors.

Example:

public class Example {
    static int staticValue;
    int instanceValue;

    static {
        staticValue = 10; // class load time initialization
    }

    {
        instanceValue = 5; // object creation initialization
    }

    public Example() {
        // constructor
    }
}

Initialization blocks are useful when complex initialization logic is needed that cannot be expressed in variable declarations or constructors.