How to fix: err_response_headers_multiple_cache_control error in Google Chrome

The err_response_headers_multiple_cache_control error in Google Chrome typically occurs when a web server sends more than one Cache-Control header in the response to a request. This error disrupts the normal operation of the browser, often causing pages to load improperly or not at all. Here are the steps to fix this error:

1. Server-side Fix:

   • If you control the server, review the server configuration to ensure it's not sending multiple Cache-Control headers. This could be due to misconfiguration in the web server software like Apache, Nginx, or IIS.
   • For Apache, check .htaccess files or the main configuration file for duplicate Header directives setting Cache-Control.
   • For Nginx, inspect the configuration files for multiple add_header directives for Cache-Control.
   • For IIS, review the web.config file for duplicate entries setting Cache-Control.

2. Contact Website Administrators:

   • If you're not in control of the server but are encountering this error while visiting a website, report the issue to the website's administrators. They can check and correct the server configuration.

3. Client-side Workaround:

   • You can try different browsers to see if the issue persists. Sometimes, a browser-specific bug might be the cause.
   • Clear your browser cache (more on this in a later section) to ensure no outdated headers are causing conflicts.

What are the common causes of the err_response_headers_multiple_cache_control error in Chrome?

Several factors can contribute to the err_response_headers_multiple_cache_control error in Chrome:

1. Server Misconfiguration:

   • The most common cause is incorrect server configuration where multiple Cache-Control headers are sent in response to a single request. This might occur due to overlapping or conflicting settings in server configuration files.

2. Content Delivery Network (CDN) Issues:

   • If the website uses a CDN, misconfiguration at the CDN level could result in sending multiple Cache-Control headers to the client.

3. Proxy Server Configuration:

   • Similar to the server, a misconfigured proxy server might add or modify Cache-Control headers, resulting in duplicates.

4. Browser Extensions:

   • Some browser extensions that manipulate HTTP headers could inadvertently add multiple Cache-Control headers.

5. Load Balancer Configuration:

   • A load balancer sitting between the client and the server might modify or add headers, leading to duplicate Cache-Control headers.

Can clearing the browser cache resolve the err_response_headers_multiple_cache_control error?

Clearing the browser cache might resolve the err_response_headers_multiple_cache_control error in some cases, particularly if the error is caused by cached responses with outdated headers. Here's how you can clear the cache in Chrome:

1. Open Chrome Settings:

   • Click on the three dots at the top right of Chrome and select Settings.

2. Access Privacy and Security:

   • Scroll down and click on Privacy and security in the left sidebar.

3. Clear Browsing Data:

   • Click on Clear browsing data.

4. Choose What to Clear:

   • Ensure Cached images and files is checked. You can also check Cookies and other site data if you want to clear all stored data.
   • Choose the time range for which you want to clear the data. To clear everything, select All time.

5. Clear Data:

   • Click on Clear data to remove the selected data.

After clearing the cache, reload the webpage to see if the error persists. Keep in mind that this is more of a temporary workaround, as the issue could recur if the server continues to send multiple Cache-Control headers.

Are there any Chrome extensions that might help prevent the err_response_headers_multiple_cache_control error?

While no Chrome extension can directly fix a server misconfiguration, some extensions might help in identifying and managing HTTP headers. Here are a few that could potentially help:

1. ModHeader:

   • This extension allows you to modify HTTP request and response headers. While it won't fix the server-side issue, it can help you temporarily remove or modify Cache-Control headers to test if that resolves the issue.
   • It can also help you identify if certain headers are causing problems by enabling you to experiment with different header configurations.

2. HTTP Header Live:

   • This tool displays all the headers sent by the server and received by the browser in real-time. It can help you pinpoint if multiple Cache-Control headers are being sent and from where they might originate.

3. Requestly:

   • Requestly allows you to modify network requests and responses. You can use it to strip out or modify headers to see if it resolves the error temporarily.

4. Clear Cache:

   • This extension provides a quick way to clear the cache, which might help if the error is caused by cached responses.

Remember, these extensions are for diagnostic purposes and won't solve the root cause if the problem is on the server side. The best solution remains correcting the server configuration to prevent sending multiple Cache-Control headers.

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