How Can I Detect When My Go HTTP Server Starts Listening?

How to Detect the Start of HTTP Server Listening

In the net/http server interface, there is no straightforward method to receive notifications when an HTTP server starts listening. The ListenAndServe function operates until the server is halted, and the Server type lacks any mechanisms for monitoring such events.

Solution

Implement custom code to signal the server's availability directly in your application:

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

// Signal that the server is operational. 

if err := http.Serve(l, rootHandler); err != nil {
    // handle error
}

This method allows you to determine when the listening socket has been opened by separating the listening and serving steps. If the signaling step does not block, the backlog of requests on the listening socket will be handled effortlessly by http.Serve.

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