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Cross-Origin XMLHttpRequest. Regular web pages can use the XMLHttpRequest object to send and receive data from remote servers, but they're limited by the same origin policy (and since Chrome 73 content scripts are also subject to the same restrictions as the web page they are injected into). Extensions aren't so limited - a script executing in ... We present three scenarios that demonstrate how Cross-Origin Resource Sharing works. All these examples use XMLHttpRequest, which can make cross-site requests in any supporting browser. A discussion of Cross-Origin Resource Sharing from a server perspective (including PHP code snippets) can be found in the Server-Side Access Control (CORS) article. XMLHttpRequest blocked by CORS - Spring Boot, Restful Api, Angular Hi, I have a Java Spring Boot backend using Spring Security and Restful Apis, and have built out a basic front end with Angular. Everything seems very simple but I cannot send a request from Angular app to the server. Please help. Thanks.