![Access to XMLHttpRequest at from origin 'https://.sharepoint.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. – Shakir's Blog Access to XMLHttpRequest at from origin 'https://.sharepoint.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. – Shakir's Blog](https://junooni.files.wordpress.com/2019/11/cors.png)
Access to XMLHttpRequest at from origin 'https://.sharepoint.com' has been blocked by CORS policy: No 'Access-Control-Allow-Origin' header is present on the requested resource. – Shakir's Blog
![Setting `access-control-allow-origin` header does not work - Developers - Internet Computer Developer Forum Setting `access-control-allow-origin` header does not work - Developers - Internet Computer Developer Forum](https://global.discourse-cdn.com/business4/uploads/dfn/optimized/2X/b/b6715dc083e47a7759938cd20d8e8c2500962774_2_1024x604.png)
Setting `access-control-allow-origin` header does not work - Developers - Internet Computer Developer Forum
![SignalR/CORS: Credential is not supported if the CORS header 'Access-Control -Allow-Origin' is '*' · Issue #4457 · dotnet/aspnetcore · GitHub SignalR/CORS: Credential is not supported if the CORS header 'Access-Control -Allow-Origin' is '*' · Issue #4457 · dotnet/aspnetcore · GitHub](https://user-images.githubusercontent.com/5381910/49557375-b31e6100-f907-11e8-89c7-3d4f02c545ec.png)
SignalR/CORS: Credential is not supported if the CORS header 'Access-Control -Allow-Origin' is '*' · Issue #4457 · dotnet/aspnetcore · GitHub
![Fix To No Access-Control-Allow-Origin Header is Present Or Working With Cross Origin Request In ASP.NET Web API - CodeProject Fix To No Access-Control-Allow-Origin Header is Present Or Working With Cross Origin Request In ASP.NET Web API - CodeProject](http://sibeeshpassion.com/wp-content/uploads/2016/03/HTTP_Response_Headers_Available-e1457687318857.png)