The development of REST APIs with API Gateway and Lambda is a process that involves creating a web service that can be accessed by clients through HTTP requests. This e-book course will cover how to handle HTTP requests and responses in REST APIs, using the Python programming language.
API Gateway
API Gateway is a fully managed service that makes it easy to develop, deploy, and maintain APIs at scale. With API Gateway, you can create REST APIs that expose HTTP and AWS Lambda services. It provides features such as controlling API traffic, authorization and access control, API traffic monitoring, and API version management.
Lambda
AWS Lambda is a service that lets you run code without provisioning or managing servers. You can run your code in response to events such as changes to data in an Amazon S3 bucket or Amazon DynamoDB table, HTTP requests from clients, or even on a set schedule.
Development of REST APIs with API Gateway and Lambda
To develop REST APIs with API Gateway and Lambda, you need to follow a few steps. First, you need to create a new resource in API Gateway. This feature is where you will define the HTTP methods that the API will support.
After you create the resource, you can start adding methods to it. For example, you can add a GET method that returns a list of all items in a database. To do this, you will need to create a Lambda function that will be invoked when the GET method is called.
In the Lambda function, you can use the Python programming language to interact with the database and return the results. The Lambda function receives an input event that contains the details of the HTTP request, such as the query parameters and request body.
After you create the Lambda function, you can connect it to the GET method in API Gateway. This is done by adding a Lambda function integration to the GET method. Lambda function integration allows API Gateway to invoke the Lambda function when the GET method is called.
Handling HTTP requests and responses in REST APIs
When you create a REST API with API Gateway and Lambda, you need to consider how you will handle HTTP requests and responses. The Lambda function receives an input event that contains the details of the HTTP request. You can use these details to determine how the Lambda function should process the request.
For example, if the HTTP request is a GET method with a specified query parameter, the Lambda function can use that query parameter to fetch a specific item from the database. If the HTTP request is a POST method with a request body, the Lambda function can use the request body to create a new item in the database.
After the Lambda function processes the request, it returns a response. The response contains an HTTP status code, response headers, and a response body. The HTTP status code indicates whether the request was successful or not. Response headers can contain additional information, such as the content type of the response body. The response body contains the data that the Lambda function retrieved or created.
In summary, developing REST APIs with API Gateway and Lambda involves creating resources and methods in API Gateway, creating Lambda functions that are invoked when the methods are called, and handling requests and responses HTTP in Lambda function. This e-book course will teach you how to do all of this using the Python programming language.
