使用AWS API网关和API密钥保护API，并验证请求是否带有有效的API密钥。

以下是一个使用Python和Boto3 SDK创建API密钥，设置API密钥和API Gateway之间的授权，以及验证API请求是否包含有效API密钥的示例代码：

创建API密钥：

import boto3

client = boto3.client('apigateway')

api_key_name = 'my-api-key'
api_key_response = client.create_api_key(
    name=api_key_name,
    enabled=True
)

api_key_id = api_key_response['id']
api_key_value = api_key_response['value']

设置API密钥和API Gateway之间的授权：

api_id = 'my-api-id'

response = client.create_usage_plan_key(
    usagePlanId=usage_plan_id,
    keyId=api_key_id,
    keyType='API_KEY'
)

response = client.create_authorizer(
    restApiId=api_id,
    name='my-authorizer',
    type='TOKEN',
    identitySource='method.request.header.Authorization',
    authorizerUri='arn:aws:apigateway:us-east-1:lambda:path/2015-03-31/functions/arn:aws:lambda:us-east-1:my-function-arn',
    authorizerCredentials='arn:aws:iam::123456789012:role/my-role',
    authorizerResultTtlInSeconds=300
)

验证API请求是否包含有效API密钥：

import requests

url = 'https://my-api.execute-api.us-east-1.amazonaws.com/prod/my-resource'
headers = {'x-api-key': api_key_value}
response = requests.get(url, headers=headers)

if response.status_code == 200:
    # valid API key
else:
    # invalid API key