http server support?

[btfak]

Hello,

I'm trying debug code like this:

package main

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

func main() {
    _ = "breakpoint"
    var count int
    http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) { fmt.Fprintf(w, "Hello, world") })
    go log.Fatal(http.ListenAndServe(":8080", nil))
    fmt.Println(count)
}

but it stop at line

go log.Fatal(http.ListenAndServe(":8080", nil))

any one help me?

[nussjustin]

The bug is in your code. Calling go log.Fatal(http.ListenAndServe(":8080", nil)) is the same as:

err := http.ListenAndServe(":8080", nil) // blocks the goroutine
go log.Fatal(err)

You are only calling log.Fatal in another goroutine. The evaluation of the arguments (in this case your http.ListenAndServe call) still happens in the calling goroutine, which in your case is the main goroutine. This blocks your main goroutine including the debugger.

You can fix your code with an anonymous function:

go func() {
    log.Fatal(http.ListenAndServe(":8080", nil))
}()

[btfak]

thanks,solved
@nuss-justin