Actix Notes:

• HttpServiceFactory (trait)

• This trait is use in HttpServer::new(|| { App::new().service(...) })

• This trait can contrains multiple route and we can also add scope (parent path) as well

• from the scope we can also add service.

• We can add nested services (like parent scope and service -> sub scope and sub services)

• There is main Struct HttpServer in which we can add multiple services and sub services as well (HttpServer struct use builder pattern).

---

web::Data

• This is structure is to share state to the server
• This struct is work as ARc and we can make Mutex<T> to make Shared mutable State.
• We can add mutiple data which can share to all routes just need to add args in function.
• IDK how it's mange args order we can take any order or any amount of arg

---

Configure App::configure(self, f: FnOnce(&mut ServiceConfig))

• We can create the function in which we can define service, routes, state.
• We can also seperate the State by Scope and Organize our code.

• Guard App::guard(self, g: Guard)

• By this function we can put some restriction on request comming from the client.
• like checking host, headers etc.

Resource

• By this functionality we can set state for specific path. or add some Configuration on specific path.