How Do I Enable Cross-Origin Resource Sharing (CORS) for My AngularJS Application?

Cross-Origin Resource Sharing (CORS) in AngularJS

CORS Overview

CORS enables a web browser to make a request to a different domain from the one that served the script. This is necessary when accessing resources from an HTTP-only domain or when the browser is using a different protocol (such as HTTPS).

Enabling CORS in AngularJS

CORS cannot be enabled directly from within AngularJS. Instead, the server that is hosting the requested resources must implement CORS. The server must send the following HTTP headers in its response:

• Access-Control-Allow-Origin: The origin of the website that is allowed to make the request.
• Access-Control-Allow-Methods: The HTTP methods that are allowed for the request.
• Access-Control-Allow-Headers: The HTTP headers that are allowed in the request.

Server-Side Implementation

The server-side implementation of CORS depends on the framework being used. For example, in PHP, the following code can be added to the .htaccess file:

Header set Access-Control-Allow-Origin "*"
Header set Access-Control-Allow-Methods "GET, POST, OPTIONS"
Header set Access-Control-Allow-Headers "Content-Type, Authorization"

Additional Considerations

• Ensure that the Authorization header is allowed in the Access-Control-Allow-Headers response header on the server.
• The browser will automatically send a preflight request (OPTIONS) before sending the actual request. The server must respond to this preflight request with the appropriate HTTP headers.
• Refer to the CORS specification for more detailed information.

Conclusion

Enabling CORS in AngularJS requires the cooperation of the server hosting the requested resources. By implementing CORS on the server, websites can grant access to resources from different domains and protocols.

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