Mastering Blazor WebAssembly by Ahmad Mozaffar

Author:Ahmad Mozaffar
Language: eng
Format: epub
Publisher: Packt Publishing Pvt. Ltd.
Published: 2023-07-21T00:00:00+00:00

8

Consuming Web APIs from Blazor WebAssembly

It’s time to feed our application and the page we have built with a real data source, let the app communicate with an online service to list the books available, and create the functionality for an admin to add new ones.

We will start this chapter by explaining why you need to communicate with an API from your Blazor app, in addition to understanding the built-in .NET class HttpClient, as well as other extensions that will be used to implement the communication with the API.

Next, we will practice sending GET and POST requests to our API. We will also explore some more advanced techniques to manage and manipulate HttpClient instances. We will use IHttpClientFactory and delegating handlers to apply global logic to HTTP requests and responses. By the end of the chapter, we will have learned how to encapsulate the API calls and take them out of the components to keep them clean and testable.

This chapter will enable you to consume APIs, either APIs you have built or third-party APIs, and teach you to implement API calls in a clear, efficient, and readable way. The following topics will be covered in this chapter:

Understanding web API clients

Calling a web API from Blazor WebAssembly

Sending a GET request

Implementing a POST web API call in Blazor WebAssembly

Exploring IHttpClientFactory and delegating handlers

Separating your API calls from components

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