Building web applications and APIs.
WHAT IT IS
The web framework within the modern platform.
WHAT IT SUPPORTS
APIs Server-rendered web applications Real-time communication Interactive web applications through Blazor
WHAT THE PIPELINE IS
A sequence of components each handling a request and passing it on.
WHY THAT MATTERS
Order determines behaviour, and misordering causes faults that are confusing.
WHAT TO ORDER CAREFULLY
Exception handling, first Encryption enforcement Static files Routing Authentication, then authorisation
WHY AUTHENTICATION BEFORE AUTHORISATION
You must establish who someone is before deciding what they may do.
WHAT DEPENDENCY INJECTION PROVIDES
Services supplied to components rather than created by them.
WHY IT MATTERS
It is what makes the application testable and replaceable.
WHAT LIFETIMES EXIST
Singleton, scoped per request, and transient.
WHAT TO BE CAREFUL WITH
Injecting a shorter-lived service into a longer-lived one.
WHAT THAT CAUSES
A captured dependency used beyond its intended lifetime, producing subtle faults.
WHAT TO CONFIGURE
Settings outside the code, per environment.
