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How to Fix nginx Redirect Issues for Non-Existent URLs

Discover effective solutions for `nginx` redirect failures when handling requests for non-existent locations, ensuring your redirection works seamlessly. --- This video is based on the question https://stackoverflow.com/q/72438760/ asked by the user 'Al Weisenborn' ( https://stackoverflow.com/u/19233983/ ) and on the answer https://stackoverflow.com/a/72439289/ provided by the user 'Ivan Shatsky' ( https://stackoverflow.com/u/7121513/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions. Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: nginx redirect fails if original request is non-existent Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l... The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license. If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com. --- Understanding the Problem: Nginx Redirect Issues for Non-Existent URLs When working with web servers like nginx, it's not uncommon to encounter scenarios where a redirect fails, especially when the original request points to a non-existent location. This can be quite frustrating; in many cases, it can disrupt the intended functionality of your web application, particularly for dynamic requests that should be handled in the back-end. In this guide, we will explore a specific problem reported by a user, where nginx fails to redirect requests to postevent3.asp, a legacy URL that they want to redirect to a PHP script. The frustration arises from the fact that all other redirects function correctly, leading to confusion about what may be going wrong. Key Questions What causes nginx to fail to redirect from a non-existent page? Can the configuration be adjusted to ensure that the request still processes correctly? An In-Depth Look at the Issue In this scenario, the request to /postevent3.asp does not seem to trigger the intended redirection. Instead, the software that initiates this request may fail to recognize the 302 HTTP redirection code and subsequently does not issue a new request. Hence, the original request does not appear in the database, indicating a problem with processing. Here is a code snippet from the nginx configuration that illustrates the current setup: [[See Video to Reveal this Text or Code Snippet]] This approach relies on HTTP redirection, but if the originating software cannot interpret that, the request will effectively go nowhere. Proposed Solution: Rewrite Instead of Redirect To tackle the issue, you can modify your nginx configuration to use a rewrite rule instead of a return directive for redirection. This will help ensure that the request is processed directly within the nginx server block. Here’s an example of how to change the configuration: [[See Video to Reveal this Text or Code Snippet]] Explanation of the New Configuration: rewrite ^ /data/submit_legacy.php break;: This command rewrites the URL internally without sending a 302 response, meaning that the requested URL is now data/submit_legacy.php, which can be directly processed by nginx. include fastcgi_params;: This includes essential FastCGI parameters required for processing requests with PHP. fastcgi_param SCRIPT_FILENAME $document_root$uri;: This sets the script filename to be executed by PHP, pointing to the correct file location after the rewrite. fastcgi_pass unix:/run/php/php7.4-fpm.sock;: This defines how to pass the request to the PHP interpreter. Conclusion: Processing Requests in Nginx Implementing this solution should lead to a successful processing of requests that were previously failing due to the redirect issue. If your modified configuration begins populating entries in your database as expected, you'll know you’ve rectified the issue stemming from the inability of the original query to handle a redirection. Remember, effectively processing legacy requests in modern web environments requires careful configuration of your server settings. If this guide helps you overcome the redirect issues you were facing, don’t hesitate to reach out for further assistance or optimization ideas!