How Can I Detect When My Go net/http Server Starts Listening?

Detecting HTTP Server Listen Initiation

When initializing an HTTP server with the net/http package, it can be challenging to actively monitor the server's status. Unlike the ListenAndServe function, which executes until the server shuts down, there seems to be no straightforward mechanism to detect the server's startup and listening phase.

Custom Approach

Given the lack of an explicit notification channel, a custom solution is required. By bypassing the ListenAndServe helper function, you can manually open a listening socket. Once the socket is established, the server can be started with http.Serve, enabling you to control the signaling process. Here's a code snippet demonstrating this approach:

l, err := net.Listen("tcp", ":8080")
if err != nil {
    // handle error
}

// Signal server's listening status.
// Closing the done channel indicates server is listening.

done := make(chan bool)
go func() {
    err := http.Serve(l, rootHandler)
    if err != nil {
        // handle error
    }
    close(done)
})()

// Wait for the done channel to close, indicating the server is listening.

<-done

This approach allows for explicit control over the server's listening status. By monitoring the done channel, you can be notified when the server is ready to accept incoming connections.

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