ERR_HTTP_RESPONSE_CODE_FAILURE: What It Means

• preload link to a removed resource — 404
• CDN caches a stale 404 longer than intended
• Service Worker intercepting fetch and returning error
• CORS preflight fail on OPTIONS request
• Origin server returned 502 due to crash

1. DevTools → Network → find red requests, check HTTP code
2. Remove <link rel="preload"> for deleted resources
3. Purge CDN cache: Cloudflare Dashboard → Caching → Purge Cache
4. Check Service Worker: chrome://inspect/#service-workers
5. For CORS: see the preflight fix guide

Check SSL Certificate →

• ERR_SSL_PROTOCOL_ERROR
• NET::ERR_CERT_AUTHORITY_INVALID
• SSL Handshake Failed
• All SSL errors

The NET::ERR_HTTP_RESPONSE_CODE_FAILURE error occurs when the server returns an unexpected HTTP response code, typically a 4xx or 5xx status. To resolve this, check your server configuration, ensure that the requested resource is available, and verify your web application’s routing. Common solutions include adjusting server settings, checking for misconfigured .htaccess files, or inspecting application logs for errors.

The NET::ERR_HTTP_RESPONSE_CODE_FAILURE error is primarily encountered in Google Chrome when the browser receives an HTTP response code that it cannot process or does not expect. This error often indicates that the server is returning a status code indicating an error (like 404 Not Found or 500 Internal Server Error) rather than the expected content. Understanding the response codes and their implications is crucial for troubleshooting this issue effectively.

Common HTTP Response Codes

• 4xx Client Errors: These codes indicate that the client seems to have made an error, such as:
• 404 Not Found: The server can't find the requested resource.
• 403 Forbidden: The server understood the request but refuses to authorize it.
• 5xx Server Errors: These codes indicate that the server failed to fulfill a valid request, such as:
• 500 Internal Server Error: A generic error message when the server encounters an unexpected condition.
• 502 Bad Gateway: The server received an invalid response from the upstream server.

When faced with the NET::ERR_HTTP_RESPONSE_CODE_FAILURE error, it is essential to review server logs, configuration files, and the application code that may be responsible for generating these status codes.

To fix the NET::ERR_HTTP_RESPONSE_CODE_FAILURE error, you can follow these practical steps:

1. Check Server Configuration: Ensure that your server is configured correctly to handle requests. For example, if you are using Apache, check the httpd.conf or .htaccess file for misconfigurations.
2. Inspect Application Logs: Review your web application’s logs for errors that might indicate why the server is returning an unexpected response code. For example, in a Node.js application, use console.error to log errors and the status codes returned.
3. Test with cURL: Use cURL to test your server’s response. The command curl -I http://yourdomain.com/resource will show you the HTTP header and status code. Look for unexpected codes.
4. Check for Redirect Loops: Ensure that there are no redirect loops in your application that can cause the server to respond with a 500 series error. You can use browser developer tools to check the network requests.
5. Validate .htaccess Rules: If you are using Apache, ensure that your .htaccess rules are correctly set. Incorrect rules can lead to 404 or other error responses. A basic .htaccess file should include:

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^ index.php [L]

6. Contact Hosting Support: If you are unable to identify the issue, consider reaching out to your hosting provider for assistance. They may have additional insights or access to server settings that you cannot modify.

By following these steps, you can address the underlying issues causing the NET::ERR_HTTP_RESPONSE_CODE_FAILURE error and ensure that your server returns the correct response codes.