How to fix: err_response_headers_multiple_set_cookie error in Google Chrome

To fix the err_response_headers_multiple_set_cookie error in Google Chrome, you can follow these steps:

1. Clear Browser Cookies and Cache:

   • Open Google Chrome and go to Settings (you can type chrome://settings/ in the address bar).
   • Scroll down and click on Privacy and security.
   • Click on Clear browsing data.
   • Make sure Cookies and other site data and Cached images and files are checked.
   • Choose the time range to All time and then click on Clear data.

2. Disable Extensions:

   • Some Chrome extensions can cause this error. To check, go to chrome://extensions/ in the address bar.
   • Disable all extensions and then reload the page that triggered the error.
   • If the error goes away, enable extensions one by one to identify the problematic one.

3. Use Incognito Mode:

   • Open a new Incognito window by pressing Ctrl Shift N on Windows/Linux or Command Shift N on Mac.
   • Try accessing the website in Incognito mode to see if the error persists. If it doesn't, then it might be related to your browser settings or extensions.

4. Check Server-Side Configuration:

   • This error can be caused by server-side misconfiguration, particularly with the Set-Cookie headers. If you are a developer or have access to the server settings, you need to check and correct any issues with multiple Set-Cookie headers in the HTTP response.

5. Update Google Chrome:

   • Ensure that your version of Google Chrome is up-to-date, as newer versions might fix known bugs related to cookie handling.
   • Go to Settings > About Chrome to check for and install any available updates.

6. Reset Chrome Settings:

   • If none of the above steps work, you can try resetting Chrome settings to their default values.
   • Go to Settings > Advanced > Reset and clean up > Restore settings to their original defaults.

By following these steps systematically, you should be able to resolve the err_response_headers_multiple_set_cookie error in Google Chrome.

What causes the err_response_headers_multiple_set_cookie error in Google Chrome?

The err_response_headers_multiple_set_cookie error in Google Chrome is caused by the web server sending multiple Set-Cookie headers in the HTTP response. This violates the HTTP specification, which allows only one Set-Cookie header per response. When Chrome encounters multiple Set-Cookie headers, it triggers this error to prevent potential security risks and maintain compliance with web standards.

Here are the detailed causes:

1. Server-Side Misconfiguration:

   • The most common cause is a misconfiguration on the web server. This can occur if multiple Set-Cookie headers are inadvertently sent in the response, perhaps due to incorrect programming in server-side scripts or misconfigured server settings.

2. Proxies and Load Balancers:

   • If there are intermediate proxies or load balancers between the client and server, they might add their own Set-Cookie headers to the response, causing the error.

3. Third-Party Scripts and Libraries:

   • Sometimes, third-party scripts or libraries used on the website might set cookies independently, resulting in multiple Set-Cookie headers in the response.

4. Browser Extensions:

   • Certain browser extensions might interfere with the HTTP response and add or modify Set-Cookie headers, leading to this error.

Understanding these causes helps in diagnosing and resolving the issue effectively.

Can clearing browser cookies resolve the err_response_headers_multiple_set_cookie error?

Clearing browser cookies can potentially resolve the err_response_headers_multiple_set_cookie error in some cases, but it is not a guaranteed fix. Here’s how it might help:

1. Temporary Resolution:

   • If the error is triggered by cookies that have been previously set and are now causing conflicts, clearing these cookies might temporarily resolve the issue. However, if the server continues to send multiple Set-Cookie headers, the error will likely reappear.

2. Isolating the Problem:

   • Clearing cookies can help isolate whether the error is caused by existing cookies or by an ongoing server-side issue. If clearing cookies resolves the error, it might indicate that the problem is related to the cookies themselves rather than a persistent server-side issue.

3. Combination with Other Steps:

   • Clearing cookies is often more effective when combined with other troubleshooting steps, such as disabling extensions or checking server-side configurations.

To clear cookies in Chrome:

• Open Settings > Privacy and security > Clear browsing data.
• Select Cookies and other site data and set the time range to All time.
• Click Clear data.

If clearing cookies does not resolve the error, further investigation into server-side configurations or extension-related issues is necessary.

Are there any specific extensions that might trigger the err_response_headers_multiple_set_cookie error in Chrome?

While there is no definitive list of specific extensions that trigger the err_response_headers_multiple_set_cookie error, certain types of extensions are more likely to cause this issue. These typically include extensions that:

1. Modify HTTP Headers:

   • Extensions that modify or inject HTTP headers, such as those used for ad-blocking, privacy enhancement, or debugging, can inadvertently add or alter Set-Cookie headers, causing the error.

2. Cookie Management Tools:

   • Extensions designed to manage or manipulate cookies (e.g., for tracking protection or session management) can conflict with how Chrome handles Set-Cookie headers.

3. Proxy and VPN Extensions:

   • Extensions that route your traffic through a proxy or VPN might add their own Set-Cookie headers to the response, leading to multiple headers being sent.

4. Security and Antivirus Extensions:

   • Some security-focused extensions might inspect and modify HTTP responses, potentially causing issues with cookie headers.

To identify if an extension is causing the error, you can:

• Disable all extensions (chrome://extensions/).
• Reload the page to see if the error persists.
• If the error goes away, re-enable extensions one at a time to pinpoint the problematic one.

Common examples of extensions that might cause this error include:

• AdBlock Plus - This ad-blocker might modify headers to block trackers.
• uBlock Origin - Similar to AdBlock, uBlock Origin can modify HTTP headers.
• HTTPS Everywhere - This extension enforces HTTPS connections and can alter headers.
• Cookie Manager - Extensions that manage cookies might interfere with Set-Cookie headers.

By systematically disabling and re-enabling extensions, you can determine if a specific extension is causing the err_response_headers_multiple_set_cookie error in Chrome.

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