![Access-Control-Allow-Origin' header issue in Angular 4 for cross domain accessing · Issue #24305 · angular/angular · GitHub Access-Control-Allow-Origin' header issue in Angular 4 for cross domain accessing · Issue #24305 · angular/angular · GitHub](https://user-images.githubusercontent.com/13352708/40979193-b3dfaa54-68f2-11e8-9391-aeb006ee690b.png)
Access-Control-Allow-Origin' header issue in Angular 4 for cross domain accessing · Issue #24305 · angular/angular · GitHub
Lucas, The Wizard (he/him) on Twitter: "For certain types of requests, like those with custom headers or methods (e.g., PUT, DELETE), the browser first sends a "preflight" request using the OPTIONS method." /
![CORS error: Request header field Authorization is not allowed by Access- Control-Allow-Headers in preflight response | bobbyhadz CORS error: Request header field Authorization is not allowed by Access- Control-Allow-Headers in preflight response | bobbyhadz](https://bobbyhadz.com/images/blog/cors-error-request-header-field-authorization-is-not-allowd-by-access-control-allow-headers/cors-headers-server-responds-with.webp)
CORS error: Request header field Authorization is not allowed by Access- Control-Allow-Headers in preflight response | bobbyhadz
![CORS error: No 'Access-Control-Allow-Origin' header is present, while I already specified the origin in the server. : r/webdev CORS error: No 'Access-Control-Allow-Origin' header is present, while I already specified the origin in the server. : r/webdev](https://preview.redd.it/d0w6vohthto91.png?width=1999&format=png&auto=webp&s=9dc388c6094a6cb9a77eaafdbb8082abb2a4026b)
CORS error: No 'Access-Control-Allow-Origin' header is present, while I already specified the origin in the server. : r/webdev
![Why postman is hot showing header such as 'Origin' and 'Access-Control- Allow-Origin' in reqest and responce header respectively? - Help - Postman Why postman is hot showing header such as 'Origin' and 'Access-Control- Allow-Origin' in reqest and responce header respectively? - Help - Postman](https://global.discourse-cdn.com/business6/uploads/getpostman/original/2X/7/75fd69ec7d652537445109c50f47e1006dcd52e9.png)
Why postman is hot showing header such as 'Origin' and 'Access-Control- Allow-Origin' in reqest and responce header respectively? - Help - Postman
![jquery - Chrome saying No 'Access-Control-Allow-Origin' header, but the header is there - Stack Overflow jquery - Chrome saying No 'Access-Control-Allow-Origin' header, but the header is there - Stack Overflow](https://i.stack.imgur.com/QbrC7.png)
jquery - Chrome saying No 'Access-Control-Allow-Origin' header, but the header is there - Stack Overflow
![internet explorer - Request header was not present in the Access-Control- Allow-Headers list - Stack Overflow internet explorer - Request header was not present in the Access-Control- Allow-Headers list - Stack Overflow](https://i.stack.imgur.com/ZlnvW.png)
internet explorer - Request header was not present in the Access-Control- Allow-Headers list - Stack Overflow
![javascript - Request header field cache-control is not allowed by Access- Control-Allow-Headers - Stack Overflow javascript - Request header field cache-control is not allowed by Access- Control-Allow-Headers - Stack Overflow](https://i.stack.imgur.com/yDq2V.png)
javascript - Request header field cache-control is not allowed by Access- Control-Allow-Headers - Stack Overflow
![Response to preflight request doesn't pass access control check: No 'Access- Control-Allow-Origin' - Kibana - Discuss the Elastic Stack Response to preflight request doesn't pass access control check: No 'Access- Control-Allow-Origin' - Kibana - Discuss the Elastic Stack](https://global.discourse-cdn.com/elastic/original/3X/2/3/23e41b23ae2a65312992c5135318796b2524abac.png)