output

Konec requestu
Spinkacek
Zkousim flush
Volam flush
panic: runtime error: invalid memory address or nil pointer dereference
[signal 0xb code=0x1 addr=0x8 pc=0x4ed7d]

goroutine 21 [running]:
runtime.panic(0x2573c0, 0x3e87a4)
	/usr/local/Cellar/go/1.3.3/libexec/src/pkg/runtime/panic.c:279 +0xf5
net/http.(*chunkWriter).flush(0xc2080520c0)
	/usr/local/Cellar/go/1.3.3/libexec/src/pkg/net/http/server.go:275 +0x4d
net/http.(*response).Flush(0xc2080520a0)
	/usr/local/Cellar/go/1.3.3/libexec/src/pkg/net/http/server.go:1024 +0x66
main.func·001()
	/private/tmp/trusty/a.go:19 +0x266
created by main.handler
	/private/tmp/trusty/a.go:22 +0x188

server-fix.go

package main

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

func handler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])

	canFlush := true

	go func() {
		fmt.Println("Spinkacek")
		time.Sleep(time.Second * 2)
		fmt.Println("Zkousim flush")
		if f, ok := w.(http.Flusher); ok {
			if canFlush {
				fmt.Println("Volam flush")
				f.Flush()

			} else {
				fmt.Println("Uz nevolam flush")
			}
		}

	}()
	fmt.Println("Konec requestu")
	canFlush = false
}

func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8080", nil)
}

server.go

package main

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

func handler(w http.ResponseWriter, r *http.Request) {
	fmt.Fprintf(w, "Hi there, I love %s!", r.URL.Path[1:])

	go func() {
		fmt.Println("Spinkacek")
		time.Sleep(time.Second * 2)
		fmt.Println("Zkousim flush")
		if f, ok := w.(http.Flusher); ok {
			fmt.Println("Volam flush")

			f.Flush()
		}

	}()
	fmt.Println("Konec requestu")

}

func main() {
	http.HandleFunc("/", handler)
	http.ListenAndServe(":8080", nil)
}