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How micorservices trusts each other

 In a microservices architecture, where different services operate independently and communicate with each other over a network, establishing trust between services is crucial for ensuring the security and integrity of the system. Here are some common methods used for microservices to trust each other: 1. **Mutual TLS (Transport Layer Security)**:    - Mutual TLS, also known as mTLS, is a method where both the client and the server authenticate each other through digital certificates.    - Each microservice is issued a digital certificate signed by a trusted Certificate Authority (CA).    - When one microservice communicates with another, both parties exchange their certificates and verify each other's identity before establishing a secure TLS connection.    - This ensures that only trusted microservices can communicate with each other. 2. **API Gateway**:    - An API gateway can act as a central entry point for incoming requests fr...
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Access token Refresh tokens

 In a microservices architecture, authentication and authorization are typically handled using tokens. Tokens are used to grant access to resources and services within the microservices ecosystem. There are two main types of tokens: access tokens and refresh tokens. 1. **Access Token**: This token is short-lived and is used to access protected resources. It contains information about the user and permissions associated with the token. 2. **Refresh Token**: This token is long-lived and is used to obtain a new access token once the current access token expires. It is more secure than storing user credentials because it can be revoked if compromised. Here's an example of how refresh tokens can be implemented in a microservices architecture using a hypothetical authentication service and a resource service: 1. **Authentication Service**:    - When a user logs in, the authentication service generates an access token and a refresh token.    - The access token is retur...
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Questions

 how to add custom header polling authentication and authorization jwt refresh token muliple auth request service injector  cross origin  soap and rest basic differnce
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How to Add Custom header in spring boot and java

**Spring Boot (Java):** In Spring Boot, you can add custom headers to HTTP responses using filters or interceptors. Here's an example of how you can do it using an interceptor: 1. Create a class that implements `HandlerInterceptor` interface: ```java import javax.servlet.http.HttpServletRequest; import javax.servlet.http.HttpServletResponse; import org.springframework.stereotype.Component; import org.springframework.web.servlet.HandlerInterceptor; @Component public class CustomHeaderInterceptor implements HandlerInterceptor {     @Override     public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) {         response.addHeader("Custom-Header", "Header-Value");         return true;     } } ``` 2. Register the interceptor in your Spring Boot application: ```java import org.springframework.beans.factory.annotation.Autowired; import org.springframework.context.annotation.Configur...
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