To enable Spring Security login via AJAX from a domain with a different port, you need to configure Cross-Origin Resource Sharing (CORS) in your Spring Boot application. By default, browsers enforce the Same-Origin Policy, which prevents web pages from making AJAX requests to different domains (including different ports on the same domain) unless CORS is explicitly configured on the server.

Here's how you can configure CORS in a Spring Boot application to allow AJAX requests from a different domain with a different port:

  1. Add Dependencies: Ensure that you have the necessary dependencies in your pom.xml file for CORS support in Spring Boot:
xml
<dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-security</artifactId> </dependency>
  1. Enable CORS Configuration: Create a configuration class to enable CORS support. You can define this class in your Spring Boot application's package.
java
import org.springframework.context.annotation.Configuration; import org.springframework.web.servlet.config.annotation.CorsRegistry; import org.springframework.web.servlet.config.annotation.WebMvcConfigurer; @Configuration public class CorsConfig implements WebMvcConfigurer { @Override public void addCorsMappings(CorsRegistry registry) { registry.addMapping("/**") .allowedOrigins("http://localhost:3000") // Replace with your frontend domain and port .allowedMethods("GET", "POST", "PUT", "DELETE", "OPTIONS") .allowedHeaders("*") .allowCredentials(true); } }

In this example, we are allowing requests from http://localhost:3000, which is the frontend domain with a different port. You can replace it with the domain and port of your frontend application.

  1. Enable CSRF Protection for AJAX Requests: By default, Spring Security enables CSRF protection, which may interfere with AJAX requests. To enable CSRF protection for web browsers but disable it for AJAX requests, you can conditionally set the CSRF token in your frontend application when making AJAX requests.

In your frontend JavaScript code, add the CSRF token as a request header when making AJAX requests:

javascript
function getCsrfToken() { return document.querySelector("meta[name='_csrf']").getAttribute("content"); } // Make AJAX request with CSRF token in headers $.ajax({ url: "http://localhost:8080/api/your-endpoint", type: "POST", data: JSON.stringify(yourData), contentType: "application/json", beforeSend: function (xhr) { xhr.setRequestHeader("X-CSRF-TOKEN", getCsrfToken()); }, success: function (data) { // Handle success }, error: function (error) { // Handle error } });

By following these steps, you should be able to enable Spring Security login via AJAX from a domain with a different port. The configured CORS settings will allow AJAX requests to be made from the specified frontend domain, and the CSRF token will ensure CSRF protection for web browsers while allowing AJAX requests to work smoothly.

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