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Can Go's `http.ListenAndServe` Bind to Multiple Ports Simultaneously?

Patricia Arquette

Dec 07, 2024 pm 09:21 PM

Can Go's `http.ListenAndServe` Bind to Multiple Ports Simultaneously?

Multi-Port Configuration in Go Web Applications

In Go, the http package provides straightforward functionality for setting up a web server. By invoking http.ListenAndServe(PORT, nil), you can establish a listening socket on the specified TCP port.

Multi-Port Binding: Is It Possible?

The question arises: can you configure the ListenAndServe function to bind to multiple ports simultaneously, say http.ListenAndServe(":80, :8080", nil)?

Answer: No, Multiple Ports from a Single Application

Unfortunately, it is not possible to bind to multiple ports directly from a single web application in Go. This behavior is imposed by the underlying operating system and networking limitations.

Alternative: Starting Multiple Listeners

To achieve multi-port functionality, you can start multiple listeners and bind them to different ports individually. For example:

go http.ListenAndServe(":80", handlerA)
http.ListenAndServe(":8080", handlerB)

This code snippet creates two separate listeners, one listening on port 80 and the other on port 8080. Each listener handles a different request handler.

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