一种解决方法是在启用了特定端口的api控制器上添加自定义约束。

A workaround is to add custom Constraint on api controller which is enabled with specific port.

1.创建 PortActionConstraint 类：

[AttributeUsage(AttributeTargets.Class)]
public class PortActionConstraint : ActionMethodSelectorAttribute
{
    public PortActionConstraint(int port)
    {
        Port = port;
    }

    public int Port { get; }

    public override bool IsValidForRequest(RouteContext routeContext, ActionDescriptor action)
    {
        //external port
        var externalPort = routeContext.HttpContext.Request.Host.Port;
        //local port 
        var localPort = routeContext.HttpContext.Connection.LocalPort;
        //write here your custom logic. for example  
        return Port == localPort;
    }
}

2。在所有控制器上添加具有相应端口号的属性像

2.Add attribute with correspond port number on all controller like

[PortActionConstraint(5000)]
[Route("api/[controller]")]
[ApiController]
public class Product1Controller : ControllerBase