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YouTube

Cross Origin Resource Sharing - Explained by Example

Hussein Nasser via YouTube

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Overview

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This course explains Cross-Origin Resource Sharing through code examples, showing how browsers handle same-origin requests, CORS headers, and preflight OPTIONS requests. It demonstrates diagnosing and fixing common origin and request-header errors with a simple web server.

Syllabus

intro
Direct same origin access
No 'Access-Control-Allow-Origin' header is present
The ‘Access-Control-Allow-Origin' header has a different value from the origin
OPTIONS 405 Method not Allowed Preflight failed
Response to preflight request did not pass No 'Access-Control-Allow-Origin' header is present
Request header field “Content-Type” is not allowed

Taught by

Hussein Nasser

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