Book Image

Learning Azure Functions

By : Mitesh Soni, Manisha Yadav
Book Image

Learning Azure Functions

By: Mitesh Soni, Manisha Yadav

Overview of this book

Functions help you easily run small pieces of code in cloud with Azure functions without worrying about a whole application or the infrastructure to run it. With Azure functions, you can use triggers to execute your code and bindings to simplify the input and output of your code. This book will start with the basics of Azure Functions. You will learn the steps to set up the environment and the tools that we will be using in the further chapters. Once you have a better understanding of this, we will be creating our first hello world function app. Later you will be introduced to triggers, how they are used to activate a function, and how binding can be used to output results of a function.You will also explore the steps to create an assembly with complex functionality that can be used by functions. Next, this book will teach you to scale your functions and use them to process data, integrate systems, and build simple APIs and microservices. Finally, this book will cover some diagnostic techniques with Azure App services and best practices of working with Azure Functions. By the end of this book, you will be well-versed with the techniques of scaling your Azure functions and making the most of serverless architecture.
Table of Contents (17 chapters)
Title Page
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Customer Feedback
Dedication
Preface

HTTP trigger


The HTTP trigger is normally used to create the API or services, where we request for data using the HTTP protocol and get the response. We can also integrate the HTTP trigger with a Webhook.

Let's start creating the HTTP trigger. We have already created a simple Azure Function and trigger. Now we will create the HTTP Login API. In this, we will send the login credential through an HTTP post request and get the response as to whether the user is valid or not.

Since we have already created a Function app in the previous example, we can now add multiple functions to it.

  1. Click on + |, select HttpTrigger-JavaScript, provide the function name, and click on the Create button:
  1. After we click on the Create button, the default template will be available. Now, we can edit and test the function:
  1. Now edit the code as follows:
  1. Save and run the code, as shown in the following screenshot:
  1. The login service is ready. Now let's check this service in Postman.
  2. To get the URL from the function, click on...