API Gateway 简介
了解 API Gateway 在无服务器架构中的作用和主要功能，以及它如何充当应用的入口
API Gateway 简介 是 CoddyKit 上的免费 Serverless Backend with AWS Lambda & API Gateway 课时。 这是第 1 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Serverless Backend with AWS Lambda & API Gateway 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Serverless Backend with AWS Lambda & API Gateway 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Intro to API Gateway
Welcome to your journey into AWS API Gateway! In serverless architectures, services like AWS Lambda handle your application's logic, but how do users access them?
API Gateway acts as the front door for your applications, handling all incoming API requests before they reach your backend services.
Your Serverless Front Door
Think of API Gateway as a highly scalable, fully managed service that sits between your users and your backend. It's like a traffic controller for your APIs.
- It receives HTTP requests from clients (web browsers, mobile apps).
- It routes these requests to the correct backend service.
- It returns the responses from your backend to the client.
Why Use API Gateway?
API Gateway isn't just a router; it provides many features that simplify building robust APIs:
- Scalability: Handles millions of API calls automatically.
- Security: Protects your backend services.
- Flexibility: Connects to various AWS services (Lambda, EC2, etc.).
- Monitoring: Integrates with CloudWatch for logging and metrics.
How it Routes Requests
When a client sends a request to your API Gateway endpoint, API Gateway uses configured routes to determine where to send it. For example, a request to /users might go to a Lambda function, while /products goes to another.
This routing is based on the HTTP method (GET, POST, PUT, DELETE) and the path of the URL.
Built-in Security Features
Security is paramount, and API Gateway offers several ways to protect your APIs:
- IAM Roles: Control who can invoke your API using AWS Identity and Access Management.
- Custom Authorizers: Use Lambda functions to implement custom authentication and authorization logic.
- CORS: Manage cross-origin resource sharing to allow specific domains to access your API.
Traffic Management
API Gateway helps you manage traffic efficiently:
- Throttling: Prevents your backend from being overwhelmed by too many requests. You can set limits per second.
- Caching: Stores responses from your backend to reduce latency and load on your services for frequently accessed data.
Transforming Requests
Sometimes, your backend service expects a different input format than what clients send. API Gateway can transform requests and responses using mapping templates.
These templates allow you to modify headers, query parameters, and body content before sending them to your backend, or before sending the backend's response back to the client.
Connecting to Lambda Functions
One of the most common uses for API Gateway in serverless is integrating with AWS Lambda. API Gateway acts as the trigger for your Lambda functions.
When an API Gateway endpoint is invoked, it passes the request details (headers, body, query params) as an event object to your Lambda function.
Lambda Handler Example
Here's a simple Python Lambda function that API Gateway could trigger. It returns a basic message as an API response.
API Gateway handles the HTTP request, invokes this function, and then takes the function's return value to construct an HTTP response for the client.
import json
def lambda_handler(event, context):
# This function is triggered by API Gateway
# The 'event' object contains details about the incoming HTTP request
print("Received an API Gateway request!")
return {
'statusCode': 200,
'headers': {
'Content-Type': 'application/json'
},
'body': json.dumps({'message': 'Hello from Lambda via API Gateway!'})
}Quick Check
Which of the following best describes the primary role of AWS API Gateway in a serverless architecture?
Recap & Next Steps
You've learned that AWS API Gateway is a crucial component in serverless architectures, acting as a scalable and secure 'front door' for your applications.
- It routes requests to backend services like Lambda.
- It provides features like security, traffic management, and request transformation.
Next, we'll dive deeper into the different types of APIs you can create with API Gateway: HTTP APIs vs. REST APIs.
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常见问题解答
「API Gateway 简介」课时是免费的吗？
是的 — 「API Gateway 简介」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Serverless Backend with AWS Lambda & API Gateway 课程的其余内容，请升级到 CoddyKit PRO。 Serverless Backend with AWS Lambda & API Gateway 课程共包含 4 节课。
「API Gateway 简介」这节课中我会学到什么？
了解 API Gateway 在无服务器架构中的作用和主要功能，以及它如何充当应用的入口 你通过在浏览器中直接运行的动手代码来练习 Serverless Backend with AWS Lambda & API Gateway，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Serverless Backend with AWS Lambda & API Gateway 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Serverless Backend with AWS Lambda & API Gateway 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 1 节课，共 4 节。
「API Gateway 简介」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Serverless Backend with AWS Lambda & API Gateway 课中编写并运行代码吗？
能。每节 Serverless Backend with AWS Lambda & API Gateway 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。