21 Calling remote APIs with IHttpClientFactory

This chapter covers

  • Problems caused by using HttpClient incorrectly to call HTTP APIs
  • Using IHttpClientFactory to manage HttpClient lifetimes
  • Encapsulating configuration and handling transient errors with IHttpClientFactory

So far in this book we’ve focused on creating web pages and exposing APIs. Whether that’s customers browsing a Razor Pages application or client-side SPAs and mobile apps consuming your APIs, we’ve been writing the APIs for others to consume.

However, it’s very common for your application to interact with third-party services by consuming their APIs. For example, an e-commerce site needs to take payments, send email and SMS messages, and retrieve exchange rates from a third-party ...

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