need to refactor existing httpclient code to use httpclientfactory

refactoring existing httpclient code to use httpclientfactory: a comprehensive tutorial

the `httpclientfactory` in .net is a powerful tool for creating and managing `httpclient` instances. it offers significant advantages over directly instantiating `httpclient`, including improved performance, resource management, and better resilience. this tutorial will guide you through refactoring your existing `httpclient` code to leverage `httpclientfactory` and explain the benefits along the way.

**why migrate to `httpclientfactory`?**

directly creating `httpclient` instances has several drawbacks:

* **socket exhaustion:** `httpclient` instances hold onto sockets, and improperly managing them can lead to socket exhaustion, especially under load. this manifests as connection errors and reduced application performance.
* **connection pooling issues:** `httpclient` doesn't automatically handle connection pooling effectively. `httpclientfactory` manages the connection pool, reusing connections and improving efficiency.
* **inability to configure connections:** directly creating `httpclient` doesn't easily allow for centralized configuration of timeouts, headers, or other connection parameters. `httpclientfactory` offers centralized configuration.
* **lifecycle management:** `httpclient` instances often need to be explicitly disposed, which can be easily missed, leading to resource leaks. `httpclientfactory` handles the disposal automatically.

**step-by-step refactoring process:**

let's assume you have existing code that uses `httpclient` directly:

here, we've named our client "mynamedclient". this name is crucia ...

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