{"id":852,"date":"2025-09-29T07:33:00","date_gmt":"2025-09-29T05:33:00","guid":{"rendered":"https:\/\/rhein-ruhr-informatik.de\/?p=852"},"modified":"2025-08-18T15:54:09","modified_gmt":"2025-08-18T13:54:09","slug":"aufbau-eines-serverlosen-rest-apis-mit-aws-api-gateway-und-lambda","status":"publish","type":"post","link":"https:\/\/rhein-ruhr-informatik.de\/en\/2025\/09\/29\/aufbau-eines-serverlosen-rest-apis-mit-aws-api-gateway-und-lambda\/","title":{"rendered":"Building a Serverless REST API with AWS API Gateway and Lambda"},"content":{"rendered":"

Introduction<\/h2>\n\n\n\n

In modern software development, speed and scalability are crucial. Companies want to deliver features quickly without worrying about maintaining infrastructure. This is where serverless computing shines.

With AWS Lambda and Amazon API Gateway, developers can build a fully functional REST API without managing servers. AWS automatically takes care of scaling, availability, and billing \u2014 you only pay for the requests that are actually processed.

In this article, we will explore how to set up a simple REST API using AWS API Gateway and AWS Lambda, with examples in Python.<\/p>\n\n\n

\n
\"\"<\/figure><\/div>\n\n\n

What is Serverless?<\/h2>\n\n\n\n

The term serverless doesn\u2019t mean \u201cno servers\u201d \u2014 servers are still involved, but they are fully managed by the cloud provider. Developers focus only on writing code, while AWS handles:

\u2013 Provisioning and scaling (from zero to millions of requests)
\u2013 High availability
\u2013 Security and patching
\u2013 Billing based on actual usage

For REST APIs, the combination of API Gateway and Lambda has become a common pattern. Let\u2019s see how they work together.<\/p>\n\n\n\n

Architecture Overview<\/h2>\n\n\n\n

The flow looks like this:
1. A client (browser, mobile app, Postman) sends a request to an API Gateway endpoint.
2. API Gateway routes the request to a configured Lambda function.
3. The Lambda function runs your custom code (Python in our case).
4. Lambda returns a response, which API Gateway forwards back to the client.

This simple architecture is powerful because you can connect multiple Lambda functions to different API routes and methods (e.g., GET \/users, POST \/orders).<\/p>\n\n\n\n

Step-by-Step Setup<\/h2>\n\n\n\n

1. Create a Lambda Function<\/h3>\n\n\n\n

1. Log in to the AWS Management Console.
2. Go to AWS Lambda \u2192 Create function.
3. Choose Author from scratch, give it a name (e.g., hello-world), and select Python 3.x as runtime.
4. In the code editor, paste the following function:<\/p>\n\n\n\n

import json

def lambda_handler(event, context):
    name = event.get(\"queryStringParameters\", {}).get(\"name\", \"World\")
    return {
        \"statusCode\": 200,
        \"headers\": {\"Content-Type\": \"application\/json\"},
        \"body\": json.dumps({\"message\": f\"Hello, {name}!\"})
    }<\/code><\/pre>\n\n\n\n
2. Create an API Gateway<\/h3>\n\n\n\n
1. Go to Amazon API Gateway \u2192 Create API.
2. Choose HTTP API (simpler) or REST API (more configurable). For this tutorial, select HTTP API.
3. Create a new API and attach it to your Lambda function (hello-world).
4. Deploy the API.<\/p>\n\n\n\n
3. Test the API<\/h3>\n\n\n\n
Once deployed, you will get an endpoint URL such as:

https:\/\/abc123.execute-api.us-east-1.amazonaws.com\/default\/hello-world<\/code>

Now test it:

curl \"https:\/\/abc123.execute-api.us-east-1.amazonaws.com\/default\/hello-world?name=Alice\"<\/code>

Response:
{ \"message\": \"Hello, Alice!\" }<\/code>

Congratulations! You have just built a serverless REST API with AWS.<\/p>\n\n\n\n
Why Use API Gateway + Lambda?<\/h2>\n\n\n\n
\u2013 Scalability: Handles traffic spikes automatically.
\u2013 Cost efficiency: Pay only when functions are executed.
\u2013 Simplicity: No server management, no patching, no scaling headaches.
\u2013 Flexibility: Connect Lambda to databases (DynamoDB, RDS), queues (SQS), or even event streams (Kinesis).<\/p>\n\n\n\n
Next Steps<\/h2>\n\n\n\n
What we built is a minimal example. In production, you might:
\u2013 Add authentication & authorization (AWS Cognito, IAM policies, custom JWT).
\u2013 Use Infrastructure as Code (AWS SAM, CDK, or Terraform).
\u2013 Enable logging & monitoring (CloudWatch, X-Ray).
\u2013 Connect to other AWS services for full applications.<\/p>\n\n\n\n
Conclusion<\/h2>\n\n\n\n
AWS API Gateway and AWS Lambda together make it incredibly easy to create serverless REST APIs. With just a few clicks and a small Python script, you can deploy an endpoint that scales automatically and costs only when used.

If you are building modern applications, experimenting with microservices, or simply want to avoid server management, this serverless approach is a great starting point.<\/p>","protected":false},"excerpt":{"rendered":"
Einf\u00fchrung In der modernen Softwareentwicklung sind Geschwindigkeit und Skalierbarkeit entscheidend. Unternehmen wollen Funktionen schnell bereitstellen, ohne sich um die Wartung von Infrastruktur zu k\u00fcmmern. Genau hier gl\u00e4nzt Serverless Computing. Mit AWS Lambda und Amazon API Gateway k\u00f6nnen Entwickler ein voll funktionsf\u00e4higes REST API erstellen, ohne Server zu betreiben. AWS k\u00fcmmert […]<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,1,26,27],"tags":[],"class_list":["post-852","post","type-post","status-publish","format-standard","hentry","category-api","category-articles","category-aws","category-serverless"],"yoast_head":"\nAufbau eines serverlosen REST-APIs mit AWS API Gateway und Lambda - Rhein-Ruhr-Informatik<\/title>\n<meta name=\"description\" content=\"Aufbau eines serverlosen REST-APIs mit AWS API Gateway und Lambda\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/rhein-ruhr-informatik.de\/en\/2025\/09\/29\/aufbau-eines-serverlosen-rest-apis-mit-aws-api-gateway-und-lambda\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Aufbau eines serverlosen REST-APIs mit AWS API Gateway und Lambda - 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