Please go through the articles given below to understand about Azure functions.

Introduction

Webhooks are user-defined HTTP callbacks. They are usually triggered by some event, such as pushing code to a repository or a comment being posted to a blog. When the event occurs, the source site makes HTTP request to the configured URL for the Webhook.

Ref

https://en.wikipedia.org/wiki/Webhook

Few real-world cases are given below, where you might have to develop Webhooks.

Please login to your Azure subscription and navigate to your Azure Function app. Subsequently, it will be displayed, as shown below. Click New Function and choose the GenericWebHook-CSharp template.


azure

For this example, I have given OnRequestRecieved as the name of the function and clicked on Create button, which would take you to Develop tab, as shown below.

azure

If you are a .NET developer, you will understand that the function given above Run accepts the input parameters first and last from the request object and sends a response Hello <<first>> <<last>> greeting as a response, if the request object has first and last parameters, else it throws an error.

We will test the Function named Run using Postman App. You can download the app at https://www.getpostman.com/

To test Azure function, you need to grab the URL of Azure function by clicking on Get function URL link, which is shown below.

azure

Clicking on Get function URL will open the URL in a small popup, as shown below.

azure

Below is the structure of Azure Function.

https://<<FunctionAppname>>.azurewebsites.net/api/<<Functioname>>

You can copy the complete URL by clicking on the icon, which is highlighted in the sreenshot given above.

Let’s open Postman and test our function, as shown below.

azure

Points to note,

  1. Choose Post method.
  2. Paste the URL of the Function app.
  3. Select Raw.
  4. Choose JSON.
  5. Provide the input in JSON format with the fields first and last.
  6. Click Send button.
  7. Review the response.

We have created an Azure Generic Webhook Trigger and validated, using Postman. However, in real-time, you might provide your Webhook URL to some third-party Applications (or one of your Applications, which can invoke the Webhook triggers), which would automatically invoke your Webhook, which is based on some events.

Summary

In this article, we have learned the following.