Скачать или смотреть Resolving the Issue of Browser Not Saving Cookies in Storage

Learn how to fix the problem of cookies not being saved in browser storage when using Angular and Spring MVC with this comprehensive guide.
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This video is based on the question https://stackoverflow.com/q/77165965/ asked by the user 'Manas Raut' ( https://stackoverflow.com/u/14632317/ ) and on the answer https://stackoverflow.com/a/77213285/ provided by the user 'Manas Raut' ( https://stackoverflow.com/u/14632317/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

In web development, working with cookies is essential for maintaining user sessions and preferences. However, developers can sometimes face issues where browsers do not save cookies, leading to frustrating user experiences. This guide addresses a common issue encountered when using an Angular frontend with a Spring MVC backend. Specifically, we will explore the problem involved in cookies not being stored in the browser and the steps needed to resolve it.

The Problem

Consider a setup where you have a Spring MVC backend running on http://localhost:8080/ and an Angular frontend on http://localhost:4200/. Upon sending a cookie from the backend to the frontend, you may find that it isn’t being saved by the browser. Even though Cross-Origin Resource Sharing (CORS) is configured correctly, the cookie fails to appear in the browser’s developer tools. Understanding how to properly configure requests and responses is key to solving this problem.

Understanding CORS

When dealing with cookies in cross-origin requests (like between your Angular app and Spring backend), you need to ensure that your server allows credentials to be shared across origins. Here's a breakdown of how to set this up properly:

CORS Configuration

You already configured CORS in your Spring MVC application, which looks like this:

[[See Video to Reveal this Text or Code Snippet]]

addMapping("/**") – This allows all endpoints to be accessed from the specified origins.

allowCredentials(true) – This allows the browser to include credentials (cookies) in requests.

allowedOrigins("http://127.0.0.1:4200") – This specifies the origin from which requests are allowed, in your case, the Angular frontend.

Sending the Cookie

When sending a cookie, you might have the following code in your Spring backend:

[[See Video to Reveal this Text or Code Snippet]]

Important Headers

When sending the response containing the cookie, the following header is crucial:

[[See Video to Reveal this Text or Code Snippet]]

The HttpOnly flag is important for security, but it also ensures that the cookie is only accessible via HTTP(S) requests.

The Solution

After troubleshooting the issue, it was discovered that the Access-Control-Allow-Origin header was not being included in the requests sent from the Angular frontend to the Spring backend. This header is essential for allowing the browser to accept cookies from different origins.

Steps to Resolve

Update Request Headers: Ensure that your frontend application sends the Access-Control-Allow-Origin header with requests. This informs the browser that it can accept cookies from your backend server.

Example in an Angular service:

[[See Video to Reveal this Text or Code Snippet]]

Test the Application: After adding the appropriate headers to your requests, check the browser developer tools (usually under the "Application" tab) to ensure that the cookie is now being saved properly.

Conclusion

By including the Access-Control-Allow-Origin header and ensuring CORS is properly configured, you can resolve the issue of cookies not being saved in the browser when working with Angular and Spring MVC applications. This small change can significantly enhance user experience by maintaining sessions and storing preferences effectively.

If you find yourself facing similar issues, revisit your CORS settings and request configurations to ensure everything is correctly set up.