Will My Goroutine Finish After the HTTP Response is Sent?

Goroutine Execution Inside an HTTP Handler

When executing a goroutine within an HTTP handler, it's natural to wonder whether its execution will continue after the response has been returned. Consider the following example code:

package main

import (
    "fmt"
    "net/http"
    "time"
)

func worker() {
    fmt.Println("worker started")
    time.Sleep(time.Second * 10)
    fmt.Println("worker completed")
}

func HomeHandler(w http.ResponseWriter, r *http.Request) {
    go worker()
    w.Write([]byte("Hello, World!"))
}

func main() {
    http.HandleFunc("/home", HomeHandler)
    http.ListenAndServe(":8081", nil)
}

This code spins up a goroutine within the HomeHandler that sleeps for 10 seconds before printing completion. Once the response is written, the main goroutine returns from the HomeHandler function.

Will the Goroutine Complete?

In this specific scenario, the goroutine will indeed complete its execution, printing the statements "worker started" and "worker completed" to the console. This is because:

• The goroutine is started as a separate thread of execution, independent of the main goroutine handling the HTTP request.
• The worker function is a lightweight thread that doesn't consume significant resources, so it's unlikely to be stopped due to system resource limitations.
• The main goroutine only returns from the HomeHandler function, not from the main() function. This means that the program continues running in the background, allowing the goroutine to finish its execution.

The only way to prematurely terminate the goroutine in this case would be to encounter an unstable state, such as running out of memory, or to explicitly stop the goroutine using synchronization techniques (not covered in this code example).

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