A brief analysis of the matching priority of Nginx configuration location

Preface

The location in the server block in the Nginx configuration is used to match the request URI so that different URIs can be processed differently.

location type and conditions for successful matching

• location = expression {} Exact match, only when URI and expression are exactly the same, the match is successful;
• location expression {} Normal matching, as long as the characters in the front part of the URI are the same as expression, the match is successful;
• location ^~ expression {} Normal matching, as long as the first part of the URI is the same as expression, the match is successful;
• location ~ regex {} regular matching (case sensitive);
• location ~* regex {} regular expression matching (case insensitive);

The summary can be divided into three categories: exact matching, ordinary matching and regular matching.

Matching logic and priority

For a request entering Nginx, its URI may meet the matching conditions of multiple locations, but the request will ultimately be processed by only one location logic (redirection is not counted), so there must be a priority difference when matching. Nginx's matching logic is as follows:

1. Perform an exact match

If the request URI matches location = (meets the exact match condition), the content of the location is executed and no other matches are performed. Otherwise, see the next item.

2. Perform normal matching

Next, Nginx will compare the URI with all the normal matching locations (regardless of ^~ type or unsigned type), and then find the location with the highest matching degree. If the location is of ^~ type, it will stop matching and execute the content of the location. If the location with the highest matching degree is of unsigned type, it will keep this unsigned location and continue with the following regular matching. If the URI does not meet the conditions of any normal matching location, it will go directly to the next step.

3. Perform regular expression matching

The matching of regular expressions is related to the order of location. Nginx will match from top to bottom. If a location is matched, the logic of that location will be executed, and all subsequent regular expression locations will be ignored, terminating the matching. If no regular expression is matched, the previously reserved unsigned location will be executed. If no location was reserved before, 404 will be returned directly.

Summarize

The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. Thank you for your support of 123WORDPRESS.COM.