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main.go
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main.go
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package main
import (
"flag"
"fmt"
"log"
"net/http"
)
var Port int
var Dir string
var UseCors bool
func init() {
flag.IntVar(&Port, "port", 8000, "port to listen on")
flag.StringVar(&Dir, "dir", ".", "directory to serve")
flag.BoolVar(&UseCors, "cors", false, "Set true to enable 'Access-Control-Allow-Origin: *' on all requests")
}
// ResponseWriter wraps http.ResponseWriter to capture the HTTP status code
type ResponseWriter struct {
http.ResponseWriter
StatusCode int
}
func (w *ResponseWriter) WriteHeader(statusCode int) {
w.StatusCode = statusCode
if UseCors {
w.ResponseWriter.Header().Add("Access-Control-Allow-Origin", "*")
}
w.ResponseWriter.WriteHeader(statusCode)
}
// Handler wraps http.Handler to log served files
type Handler struct {
http.Handler
}
func (h *Handler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
rw := &ResponseWriter{w, 0}
h.Handler.ServeHTTP(rw, r)
log.Println(r.RemoteAddr, r.Method, rw.StatusCode, r.URL)
}
func main() {
flag.Parse()
handler := &Handler{http.FileServer(http.Dir(Dir))}
http.Handle("/", handler)
addr := fmt.Sprintf(":%d", Port)
log.Printf("Listening on %s\n", addr)
log.Fatal(http.ListenAndServe(addr, nil))
}