Basically, think about opening an onion and peeling back the layers til you get to the core. The core is your application and each layer is another service or layer of protection. What can you do with these layers of protection? Anything! You can check tokens, check that the values coming in are santizied, or strip them of whitespace, you can add headers to the HTTP response going out, say a Sunset header.
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Middlewares are awesome! The best way to show you is looking at this page in a popular PHP framework's docs: slimframework.com/docs/v3/concepts...
Basically, think about opening an onion and peeling back the layers til you get to the core. The core is your application and each layer is another service or layer of protection. What can you do with these layers of protection? Anything! You can check tokens, check that the values coming in are santizied, or strip them of whitespace, you can add headers to the HTTP response going out, say a Sunset header.