AWS提供了基于路径的路由功能，可以根据请求的路径将流量转发到不同的目标组。下面是一个示例：

1. 创建两个目标组，分别为web-servers和api-servers，这里假设目标组中已经添加了对应的实例。

2. 创建应用负载均衡器并绑定监听器

import boto3

elbv2 = boto3.client('elbv2')
response = elbv2.create_load_balancer(
    Name='my-loadbalancer',
    Subnets=[
        'subnet-0123456789abcdef0',
        'subnet-0123456789abcdef1',
    ],
    Scheme='internet-facing',
    Type='application',
)
load_balancer_arn = response['LoadBalancers'][0]['LoadBalancerArn']

response = elbv2.create_listener(
    LoadBalancerArn=load_balancer_arn,
    Protocol='HTTP',
    Port=80,
    DefaultActions=[
        {
            'Type': 'fixed-response',
            'FixedResponseConfig': {
                'ContentType': 'text/plain',
                'MessageBody': 'Hello from my Load Balancer',
                'StatusCode': '200'
            }
        }
    ]
)
listener_arn = response['Listeners'][0]['ListenerArn']

3. 创建两个目标组和对应的规则，以将不同路径的流量转发到不同的目标组中。

response = elbv2.create_target_group(
    Name='web-servers',
    Protocol='HTTP',
    Port=80,
    VpcId='vpc-0123456789abcdef0'
)
web_target_group_arn = response['TargetGroups'][0]['TargetGroupArn']

response = elbv2.create_target_group(
    Name='api-servers',
    Protocol='HTTP',
    Port=80,
    VpcId='vpc-0123456789abcdef0'
)
api_target_group_arn = response['TargetGroups'][0]['TargetGroupArn']

response = elbv2.create_rule(
    ListenerArn=listener_arn,
    Conditions=[
        {
            'Field': 'path-pattern',
            'Values': [
                '/api/*'
            ]
        }
    ],
    Priority=1,
    Actions=[
        {
            'Type': 'forward',
            'TargetGroupArn': api_target_group_arn
        }
    ]
)

response = elbv2.create_rule(
    ListenerArn=listener_arn,
    Conditions=[
        {
            'Field': 'path-pattern',
            'Values': [
                '/web/*'
            ]
        }
    ],
    Priority