1. 确认Lambda函数已经部署，函数名称和Arn已经正确

2. 确认API网关部署在同一个AWS账号

3. 使用AWS CDK创建API网关，并将它与Lambda函数关联，代码示例如下：

import * as cdk from '@aws-cdk/core'
import * as apigateway from '@aws-cdk/aws-apigateway'
import * as lambda from '@aws-cdk/aws-lambda'

export class MyStack extends cdk.Stack {
  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
    super(scope, id, props)

    // 创建lambda函数
    const myLambdaFunction = new lambda.Function(this, 'myLambda', {
      runtime: lambda.Runtime.NODEJS_10_X,
      code: lambda.Code.fromAsset('path/to/lambda/code'),
      handler: 'index.handler',
    })

    // 创建API Gateway
    const api = new apigateway.RestApi(this, 'myApi', {
      restApiName: 'My test rest api',
    })

    // 创建默认的Lambda集成
    const myLambdaIntegration = new apigateway.LambdaIntegration(myLambdaFunction)

    api
      .root
      .addMethod('GET', myLambdaIntegration)
  }
}

4. 在Lambda函数中添加API网关的触发器，代码示例如下：

import * as cdk from '@aws-cdk/core'
import * as lambda from '@aws-cdk/aws-lambda'
import * as apigateway from '@aws-cdk/aws-apigateway'

export class MyStack extends cdk.Stack {
  constructor(scope: cdk.App, id: string, props?: cdk.StackProps) {
    super(scope, id, props)

    // 创建lambda函数
    const myLambdaFunction = new lambda.Function(this, 'myLambda', {
      runtime: lambda.Runtime.NODEJS_10_X,
      code: lambda.Code.fromAsset('path/to/lambda/code'),
      handler: 'index.handler',
    })

    // 创建API Gateway
    const api = new apigateway.RestApi(this, 'myApi', {
      restApiName: 'My