What is missing cookie

"Cookie missing" means that a specific cookie is not found in the client browser. The solution includes: 1. Check whether the cookie is correctly set on the server side; 2. Confirm whether the cookie has expired; 3. . Check the browser's cookie settings; 4. Make sure the correct CORS header is set on the server side; 5. Log in again or rebuild the relevant session state.

# Operating system for this tutorial: Windows 10 system, Dell G3 computer.

"Cookie Missing" means that a specific cookie is not found in the client browser. This may be due to the following reasons:

1. No cookie set: The server did not set the corresponding cookie in the response header, resulting in the browser not receiving the cookie to be stored.

2. Cookie expiration or invalidation: If the server sets a cookie with an expiration time, and the cookie has expired, the browser will treat it as invalid or missing.

3. Cookies are disabled in the browser: The user may have disabled cookies in the browser settings, resulting in the browser being unable to receive and store any cookies.

4. Cross-domain request: If the website is under a different domain name, the browser will not send cookies under that domain name by default. This is a security mechanism called the "same origin policy". Only when the server sets permissions for cross-domain access (for example, through the CORS header), the browser will send the corresponding cookie.

5. Cookie Deletion: The user may have manually deleted one or all cookies from the browser, causing them to be missing from subsequent requests.

Methods to solve missing cookies include:

1. Check whether the cookie is set correctly on the server side, and ensure that the correct cookie is included in the response header Set-Cookie field.

2. Confirm whether the cookie has expired. If it has expired, you need to reset a valid cookie on the server side.

3. Check your browser's cookie settings to make sure they are not disabled or restricted.

4. For cross-domain requests, ensure that the correct CORS headers are set on the server side to allow cross-domain access and transfer of cookies.

5. If the user deletes the cookie or uses a different browser, he may need to log in again or rebuild the relevant session state.

In short, missing cookies may be caused by various reasons such as setting issues, expiration, disabling, cross-domain or user operations, etc., and need to be carefully checked and processed.

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