清除使用CDK设置的API网关资源策略

1. 在使用CDK设置API网关资源策略时，如果需要清除已经设置的策略，可以使用以下代码：

import * as cdk from 'aws-cdk-lib';
import { RestApi } from 'aws-cdk-lib/aws-apigateway';
import { Effect, PolicyStatement } from '@aws-cdk/aws-iam';

// 创建API网关
const api = new RestApi(stack, 'my-api');

// 设置API网关资源策略
api.root.addMethod('GET', new LambdaIntegration(handler), {
  authorizationType: AuthorizationType.IAM,
  methodResponses: [{
    statusCode: '200',
    responseModels: {
      'application/json': new Model()
    },
    responseParameters: {
      'method.response.header.Access-Control-Allow-Origin': true
    }
  }]
});
api.addUsagePlan('my-usage-plan', {
  apiKey: {
    name: 'my-api-key',
    value: 'my-api-key-value'
  }
});

// 清除已经设置的API网关资源策略
api.root.addMethod('DELETE', new LambdaIntegration(handler), {
  authorizationType: AuthorizationType.IAM,
  methodResponses: [{
    statusCode: '200',
    responseModels: {
      'application/json': new Model()
    },
    responseParameters: {
      'method.response.header.Access-Control-Allow-Origin': true
    }
  }]
});
api.addUsagePlan('my-usage-plan', {
  apiKey: {
    name: 'my-api-key',
    value: 'my-api-key-value'
  },
  throttle: {
    rateLimit: 1000,
    burstLimit: 2000
  }
});

// 添加清除API网关资源策略时所需的IAM权限
const lambdaRole = new Role(this, 'LambdaRole', {
  assumedBy: new ServicePrincipal('lambda.amazonaws.com')
});
lambdaRole.addToPolicy(new PolicyStatement({
  resources: [api.arn],
  actions: ['apigateway:DELETE']
}));

2. 使用AWS CLI命令导出API网关资源策略，并手动修改为“Allow all”策略，最后重新导入。命