Apex REST callouts | Apex Integration Services | Trailhead | Salesforce

Apex Integration Services : Apex Rest Callouts

Module: https://trailhead.salesforce.com/content/learn/modules/apex_integration_services/apex_integration_rest_callouts

This module teaches you how to make HTTP requests from Apex to external RESTful services and handle responses. It emphasizes understanding the principles of REST (Representational State Transfer) and how it is used in web services.

Key Concepts:

HTTP Methods:
GET: Retrieve data from an external service.
POST: Send data to create a new resource.
PUT: Update an existing resource.
DELETE: Remove a resource.

Endpoint URIs:
Learn how to construct and use endpoint URIs (Uniform Resource Identifiers) to target the specific resources in external services.

HTTP Request Basics:
Create and configure HTTP request objects.
Set HTTP headers, including authorization and content-type headers.
Use JSON (JavaScript Object Notation) for data formatting.

Handling Responses:
Process HTTP response objects.
Check response status codes to determine the success or failure of callouts.
Parse response bodies to extract relevant information.

Creating and Using HTTPCalloutMock:
Implement mock callouts using the HttpCalloutMock interface.
Test your callout logic without sending actual HTTP requests.
Validate the behavior of your integration code using test data.

Practical Implementation

Making a GET Request:
Write Apex code to send a GET request to an external REST service.
Handle the response and parse JSON data.
Making a POST Request:
Construct a POST request to send data to an external service.
Include JSON-formatted request bodies and handle responses.

Error Handling:
Implement error handling for failed callouts.
Use try-catch blocks to manage exceptions and ensure your code can gracefully handle errors.

Examples and Exercises
Throughout the module, you'll find practical examples and exercises designed to help you apply the concepts learned. This includes:
Writing Apex code for various HTTP methods.
Setting up mock callouts for testing purposes.
Parsing JSON responses and handling errors effectively.

This module aims to provide you with the knowledge and skills necessary to integrate your Salesforce applications with external REST services, ensuring robust and reliable data exchanges.
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