Block Specific User-agents (Apache) Block specific User-agents' requests. Useful for dealing with malicious bots.

Dynamic robots.txt (Apache) Rewrite requests for robots.txt to a dynamic file which generates robot directives.

Reverse Proxy To Another Server (Apache) Proxy an intranet, or other, server's content through a different webserver.

Manage Static Rewrite Rules with RewriteMaps (IIS) Centrally manage any number of redirect and rewrite rules by leveraging an external RewriteMap configuration file.

Rewrite URL as Query String Parameters (IIS) Create SEO friendly URLs by tokenizing the URL into query_string parameters.

Reverse Proxy To Another Server (NGINX) Proxy an intranet, or other, server's content through a different webserver.

Enforce Lower Case URLs (NGINX) Force URLs to lowercase, very important for SEO to avoid duplicate content penalties in search engines.

Remove File Extensions From URLs (NGINX) Clean up the appearance of URLs slightly by removing file extensions. Used to tidy up URLs a bit, not to 'cloak the technology in use'.

Enforce Lower Case URLs (Apache) Force lowercase URLs, especially important for SEO on Windows-based servers, which are case-insensitive.

Permanently Redirect Entire Directory (Apache) Redirect an entire directory to another location. Useful when restructuring a website.