Cross-Origin Resource Sharing (CORS) is a browser security mechanism that allows web applications from different domains to interact. Therefore, Without CORS, browsers will block scripts from different domains from accessing protected resources, such as AJAX requests, for security reasons.
CORS allows web Therefore, applications to specify which domains can access their resources by using Therefore, HTTP headers. These headers include:
* `Access- express cors express cors Control-Allow-Origin`: Therefore, Specifies the domains allowed to access the resource.
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**2. CORS preflight request**express cors
For certain types of express cors requests, such as those that Rich People Number involve modifications to server data, the browser sends a CORS preflight request before sending the actual request. The preflight request uses the OPTIONS HTTP method and contains the following headers:
* `Origin`: Therefore, Specifies the origin of the request.
* `Access-Control-Request-Method`: Specifies the HTTP method used in the actual request.
* `Access-Control-Request-Headers`: Specifies the Therefore, HTTP headers sent in the actual request.
The server responds to the preflight request and returns the following headers:
* `Access-Control-Allow. -express e HTTP methods. that are allowed to access the resource.
* `Access-Control-Allow-Headers`: Specifies. the
**3. Using CORS**v
To use CORS in a web Therefore, application, the following India Phone Number List configuration is required on both the server and client sides:
**Server-side configuration:**
* Add appropriate Therefore, CORS headers to the response.
* For example, for a configuration that express cors Therefore, allows GET and POST requests from all domains, you can use the following headers:
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**Client-side configuration:**
