Can a Single Go Application Bind to Multiple Ports Using `http.ListenAndServe`?

HTTP Port Configuration in Go

In Go, the net/http package provides the functionality to set up a basic web server. As you mentioned, the http.ListenAndServe function binds a listener to a specified TCP port, allowing connections on that port.

Question: Multi-Port Binding in a Single Application

You asked if it's possible to listen on multiple ports from a single web application using the http.ListenAndServe function, with a syntax similar to http.ListenAndServe(":80, :8080", nil).

Answer: Single Port Binding Only

Unfortunately, it's not possible to listen on multiple ports directly using the http.ListenAndServe function. The TCP specification does not allow a single application to bind to multiple ports simultaneously.

Alternative: Separate Listeners

If you need to listen on multiple ports from a single application, you can start multiple listeners in parallel, each on a different port. For example:

// Define port numbers
port1 := "80"
port2 := "8080"

// Start listeners on different ports
go http.ListenAndServe(":"+port1, handlerA)
http.ListenAndServe(":"+port2, handlerB)

In this way, you can create multiple listeners on different ports, each handling its own request pipeline.

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