在AWS上进行无服务器部署时，可能会遇到路由中断的问题。以下是一个包含代码示例的解决方法：

1. 检查VPC子网的路由表设置是否正确。确保在路由表中添加了适当的目标和关联的子网。

import boto3

def check_route_table(route_table_id):
    ec2_client = boto3.client('ec2')
    response = ec2_client.describe_route_tables(RouteTableIds=[route_table_id])
    routes = response['RouteTables'][0]['Routes']
    
    for route in routes:
        if route['DestinationCidrBlock'] == '0.0.0.0/0':
            if 'VpcPeeringConnectionId' in route:
                print('Route table is using a VPC peering connection')
            elif 'GatewayId' in route:
                print('Route table is using an internet gateway')
            else:
                print('Route table is not properly configured')
            break

route_table_id = 'your-route-table-id'
check_route_table(route_table_id)

2. 检查子网的网络访问控制列表（Network Access Control List，NACL）设置。确保子网的NACL允许必要的流量通过。

import boto3

def check_network_acl(network_acl_id):
    ec2_client = boto3.client('ec2')
    response = ec2_client.describe_network_acls(NetworkAclIds=[network_acl_id])
    entries = response['NetworkAcls'][0]['Entries']
    
    for entry in entries:
        if entry['RuleNumber'] == 100 and entry['CidrBlock'] == '0.0.0.0/0' and entry['Egress'] == False:
            print('Network ACL is properly configured')
            break

network_acl_id = 'your-network-acl-id'
check_network_acl(network_acl_id)

3. 检查安全组设置。确保安全组允许必要的流量通过。

import boto3

def check_security_group(security_group_id):
    ec2_client = boto3.client('ec2')
    response = ec2_client.describe_security_groups(GroupIds=[security_group_id])
    ip_permissions = response['SecurityGroups'][0]['IpPermissions']
    
    for permission in ip_permissions:
        if permission['FromPort'] <= 80 and permission['ToPort'] >= 80 and {'CidrIp': '0.0.0.0/0'} in permission['IpRanges']:
            print('Security group allows HTTP traffic')
            break

security_group_id = 'your-security-group-id'
check_security_group(security_group_id)

通过检查VPC子网的路由表、网络访问控制列表和安全组设置，可以确定是否存在路由中断问题，并采取相应的解决措施。