Package de.freaklamarsch.systarest

Class CorsFilter

java.lang.Object
de.freaklamarsch.systarest.CorsFilter
All Implemented Interfaces:
jakarta.ws.rs.container.ContainerResponseFilter
@Provider
public class CorsFilter
extends java.lang.Object
implements jakarta.ws.rs.container.ContainerResponseFilter
A filter that adds Cross-Origin Resource Sharing (CORS) headers to HTTP responses. This allows client-side JavaScript to make fetch calls to the server without being blocked by the browser's same-origin policy.

Without this filter, browsers like Chrome will block fetch attempts with messages like: "Access to fetch at 'http://systapi:1337/SystaREST/rawdata' from origin 'null' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. If an opaque response serves your needs, set the request's mode to 'no-cors' to fetch the resource with CORS disabled."

  • Constructor Summary

    Constructors
    Constructor Description
    CorsFilter()  

  • Method Summary

    Modifier and Type Method Description
    void filter​(jakarta.ws.rs.container.ContainerRequestContext requestContext, jakarta.ws.rs.container.ContainerResponseContext responseContext)
    Adds CORS headers to the HTTP response to allow cross-origin requests.

    Methods inherited from class java.lang.Object

    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

  • Constructor Details

    • CorsFilter

      public CorsFilter()

  • Method Details

    • filter

      public void filter​(jakarta.ws.rs.container.ContainerRequestContext requestContext, jakarta.ws.rs.container.ContainerResponseContext responseContext) throws java.io.IOException
      Adds CORS headers to the HTTP response to allow cross-origin requests.
      Specified by:
      filter in interface jakarta.ws.rs.container.ContainerResponseFilter
      Parameters:
      requestContext - the context of the incoming HTTP request
      responseContext - the context of the outgoing HTTP response
      Throws:
      java.io.IOException - if an I/O error occurs