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All About HAProxy ACL Path Beg

Did you know that acl path_beg is a condition in HAProxy that is used within ACLs to match URLs based on their paths?

Furthermore, path_beg helps us check if the path of an HTTP request begins with a certain string or prefix. This condition is often used to route or filter requests according to their URL paths.

Let’s take a look at how acl path_beg works:

1. In order to use acl path_beg, we have to define an ACL in our HAProxy configuration. We have to name the ACL and mention the condition we want to check.

   For example

   acl is_blog_request path_beg /blog

   Here, we define an ACL named is_blog_request. It checks if the path of the incoming request starts with “/blog.”
2. Now, the ACL condition is evaluated when an HTTP request arrives at your HAProxy server.  If the condition is met, the ACL is considered “true” or “matched.”
3. Furthermore, we can use the matched ACL condition to make routing decisions or apply specific actions in the HAProxy configuration.

   For example, you can use it to direct requests to different backend servers, apply access control rules, or perform URL rewriting.

   For example:

   use_backend blog_servers if is_blog_request

   Here, the use_backend directive routes request to a backend named blog_servers if the is_blog_request ACL condition is true.
4. Additionally, we can use wildcard characters with path_beg to match multiple URL paths.

Our experts would like to point out that path_beg performs exact prefix matching. In other words, it checks if the path starts with the specified string and does not require an exact match of the entire path.

Additionally, path_beg is case-sensitive by default. If we want to carry out a case-insensitive match, you can use -i along with path_beg.

acl is_blog_request path_beg -i /Blog

In summary, acl path_beg in HAProxy is handy for matching and filtering HTTP requests according to their URL paths. This allows us to make routing and processing decisions in our load balancing or reverse proxy setup.

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Conclusion

In brief, our Support Techs introduced us to HAProxy ACL Path Beg.