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Angular – The 'Access-Control-Allow-Origin' header has a value 'http://localhost:4200' that is not equal to the supplied origin – iTecNote
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Angular: Multiple Values in 'Access-Control-Allow-Origin' Header of Spring Boot
Response to preflight request doesn't pass access control check: No 'Access- Control-Allow-Origin' header is present on the requested resource · Issue #1004 · valor-software/ng2-file-upload · GitHub
Access-Control-Allow-Origin' header issue in Angular 4 for cross domain accessing · Issue #24305 · angular/angular · GitHub
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