CORS errors occur when a frontend attempts to request resources from a backend hosted on a different server. The Same-Origin Policy (SOP) enforces restrictions that block JavaScript access to cross-origin responses. To allow such requests, the server must send specific CORS headers to the browser. Both SOP and CORS serve to protect users from unauthorized access to sensitive information across various origins. Understanding these mechanisms is vital for developers in creating secure web applications.
Access to fetch at 'https://api.example.com' from origin 'https://app.yoursaas.com' has been blocked by CORS. This error often occurs when the backend and frontend are hosted on separate servers.
The Same-Origin Policy (SOP) is a critical security mechanism that restricts how a document or script loaded by one origin can interact with a resource from another origin.
To bypass the restrictions of the Same-Origin Policy, your server needs to explicitly allow access by responding with the appropriate Cross-Origin Resource Sharing (CORS) headers.
Both SOP and CORS are essential for protecting users by preventing unauthorized access to resources and sensitive data between different origins.
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