cross origin request blocked the same origin policy disallows reading the remote resource at http vtl lab com vn crecc cms api member register json reason cors request did not succeed with cod

The "same-origin policy" is a security feature implemented in web browsers that prevents a web page from making requests to a different domain than the one that served the web page. This policy is in place to prevent malicious websites from making unauthorized requests on behalf of the user.

When a web page attempts to make a request to a different domain, the browser will check if the server has indicated that it is willing to accept cross-origin requests from the requesting domain. This check is done by checking for the presence of specific headers, such as "Access-Control-Allow-Origin", in the server's response.

If the server does not include these headers, or if the headers indicate that the server is not willing to accept cross-origin requests from the requesting domain, the browser will block the request and the user will see an error message such as "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://vtl.lab.com.vn/crecc/cms/api/member/register.json. Reason: CORS request did not succeed."

The "CORS request did not succeed" error message is indicating that the browser blocked the request because the server did not indicate that it is willing to accept cross-origin requests from the requesting domain. To resolve this issue, the server must be configured to include the appropriate headers in its response, allowing the browser to successfully complete the request.

In short, CORS error message will be shown when the browser blocks a web page from making a request to a different domain due to the same-origin policy. To fix this issue, the server should be configured to allow cross-origin requests from the domain that is trying to make the request.

In addition to the same-origin policy, there is also the concept of "CORS headers" which allow servers to indicate their willingness to accept cross-origin requests. These headers are sent as part of the server's response and tell the browser whether or not to allow a particular request. Some common CORS headers include:

• Access-Control-Allow-Origin: This header specifies the origin or origins that are allowed to make cross-origin requests to the server. For example, if the server wants to allow requests from any domain, it can set this header to "*".

• Access-Control-Allow-Methods: This header specifies the HTTP methods that are allowed to be used in cross-origin requests. For example, if the server only wants to allow GET requests, it can set this header to "GET".

• Access-Control-Allow-Headers: This header specifies the request headers that are allowed to be used in cross-origin requests. For example, if the server only wants to allow requests with a certain authentication token, it can set this header to "Authorization".

• Access-Control-Max-Age: This header specifies the maximum amount of time (in seconds) that the browser should cache the server's CORS headers.

In addition to these headers, there are also preflight requests which are a type of CORS request that a browser makes before sending the actual request. These requests are used to check whether the server will allow the actual request, and are typically sent using the HTTP OPTIONS method.

It's worth noting that CORS headers need to be set on the server side. A client side JavaScript cannot modify or set them. Therefore, if you are the developer of the server and your server is not configured to include the appropriate headers, you should modify the server's configuration to include them. If you are not the developer of the server, you may need to contact the server's administrator or developer to get the issue resolved.

In summary, the same-origin policy is a security feature implemented in web browsers that prevents a web page from making requests to a different domain than the one that served the web page. CORS headers are used to indicate the willingness of the server to accept cross-origin requests. Preflight requests are a type of CORS request that a browser makes before sending the actual request. To avoid CORS errors, the server should be configured to allow cross-origin requests from the domain that is trying to make the request.

Popular questions

1. What is the same-origin policy and why is it implemented in web browsers?

• The same-origin policy is a security feature that prevents a web page from making requests to a different domain than the one that served the web page. It is implemented in web browsers to prevent malicious websites from making unauthorized requests on behalf of the user.

2. What happens when a web page attempts to make a request to a different domain?

• When a web page attempts to make a request to a different domain, the browser will check if the server has indicated that it is willing to accept cross-origin requests from the requesting domain. This check is done by checking for the presence of specific headers, such as "Access-Control-Allow-Origin", in the server's response.

3. What is the error message "Cross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at http://vtl.lab.com.vn/crecc/cms/api/member/register.json. Reason: CORS request did not succeed" indicating?

• The error message is indicating that the browser blocked the request because the server did not indicate that it is willing to accept cross-origin requests from the requesting domain.

4. What are CORS headers and how do they relate to the same-origin policy?

• CORS headers are headers sent as part of the server's response that tell the browser whether or not to allow a particular request. They allow servers to indicate their willingness to accept cross-origin requests. These headers are used in conjunction with the same-origin policy to determine whether or not a request should be allowed.

5. What can be done to fix the "CORS request did not succeed" error?

• To fix this issue, the server must be configured to include the appropriate headers in its response, allowing the browser to successfully complete the request. This can be done by modifying the server's configuration to include the necessary headers, such as "Access-Control-Allow-Origin". If you are not the developer of the server, you may need to contact the server's administrator or developer to get the issue resolved.

Tag

Security.