Api gateway

Some architects, cloud engineers, and DevOps folks often say, “Microservices are small monoliths.” This stems from the complexity of dealing with a number of services, especially managing and configuring their network rules and security aspects. When clients make requests to microservices spread over multiple clusters and clouds in a distributed system, tracking each request to ensure security and proper routing rules becomes tedious. Ideally, backend services should not be doing that, as they should be left alone with delivering the business logic. This is where an API gateway, a single entry point for all requests, comes in. Let us see what an API gateway is and what features and benefits it offers. What Is an API Gateway? An API gateway is a server (or L7 proxy) between a client and microservices that acts as a centralized entry point for all clients into the system. It is a reverse proxy that accepts client API calls and forwards them to the appropriate microservice (refer to Fig. A below). By providing an API for each client, API gateways encapsulate the complexity of the underlying system and let clients talk to it instead of calling specific services. They also perform security checks (authentication and authorization) before the traffic reaches the service, thus leaving services to focus on their core functionalities. Fig. A – API gateway implementation conceptual diagram for microservices architecture The Need for API Gateways for Microservices The challenges pose...

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Topics • • • • Obtain an API's invoke URL in the API Gateway console You can find a REST API's root URL in the Stage Editor for the API in the API Gateway console. It's listed as the Invoke URL at the top. If the API's root resource exposes a GET method without requiring user authentication, you can call the method by clicking the Invoke URL link. You can also construct this root URL by combining the host and basePath fields of an exported OpenAPI definition file of the API. If an API permits anonymous access, you can use any web browser to invoke any GET method calls by copying and pasting an appropriate invocation URL to the browser's address bar. For other methods or any authentication-required calls, the invocation are more involved because you must specify a payload or sign the requests. You can handle these in a script behind an HTML page or in a client application using one of the AWS SDKs. For testing, you can use the API Gateway console to call an API by using the API Gateway's TestInvoke feature, which bypasses the Invoke URL and allows API testing before the API is deployed. Alternatively, you can use the Postman application to test a successfully deployed API, without writing a script or a client.

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In this getting started exercise, you create a serverless API. Serverless APIs let you focus on your applications, instead of spending time provisioning and managing servers. This exercise takes less than 20 minutes to complete, and is possible within the AWS Free Tier . First, you create a Lambda function using the AWS Lambda console. Next, you create an HTTP API using the API Gateway console. Then, you invoke your API. This exercise uses an HTTP API for simplicity. API Gateway also supports REST APIs, which include more features. To learn more, see When you invoke your HTTP API, API Gateway routes the request to your Lambda function. Lambda runs the Lambda function and returns a response to API Gateway. API Gateway then returns a response to you. Topics • • • • • Step 1: Create a Lambda function You use a Lambda function for the backend of your API. Lambda runs your code only when needed and scales automatically, from a few requests per day to thousands per second. For this example, you use the default Node.js function from the Lambda console. To create a Lambda function • Sign in to the Lambda console at https://console.aws.amazon.com/lambda . • Choose Create function. • For Function name, enter my-function. • Choose Create function. The example function returns a 200 response to clients, and the text Hello from Lambda!. You can modify your Lambda function, as long as the function's response aligns with the The default Lambda function code should look similar to the fol...

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