fix missing Content-Type header in response.

dashboard.go

@@ -2,7 +2,6 @@ package main
 
 import (
 	"bytes"
-	"compress/gzip"
 	"encoding/json"
 	"flag"
 	"fmt"
@@ -88,29 +87,6 @@ type Node struct {
 	Address string
 }
 
-type gzipResponseWriter struct {
-	io.Writer
-	http.ResponseWriter
-}
-
-func (w gzipResponseWriter) Write(b []byte) (int, error) {
-	return w.Writer.Write(b)
-}
-
-func makeGzipHandler(fn http.HandlerFunc) http.HandlerFunc {
-	return func(w http.ResponseWriter, r *http.Request) {
-		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
-			fn(w, r)
-			return
-		}
-		w.Header().Set("Content-Encoding", "gzip")
-		gz := gzip.NewWriter(w)
-		defer gz.Close()
-		gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
-		fn(gzr, r)
-	}
-}
-
 func main() {
 	var (
 		port        int
@@ -170,6 +146,7 @@ func indexPage(w http.ResponseWriter, r *http.Request) {
 	if err != nil {
 		log.Println(err)
 	}
+	w.Header().Set("Content-Type", "text/html; charset=utf-8")
 	fmt.Fprint(w, string(data))
 }
 

http.go

@@ -0,0 +1,39 @@
+package main
+
+import (
+	"compress/gzip"
+	"io"
+	"net/http"
+	"strings"
+)
+
+type gzipResponseWriter struct {
+	io.Writer
+	http.ResponseWriter
+}
+
+func (w gzipResponseWriter) Write(b []byte) (int, error) {
+	return w.Writer.Write(b)
+}
+
+func (w gzipResponseWriter) Header() http.Header {
+	return w.ResponseWriter.Header()
+}
+
+func (w gzipResponseWriter) WriteHeader(code int) {
+	w.ResponseWriter.WriteHeader(code)
+}
+
+func makeGzipHandler(fn http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, r *http.Request) {
+		if !strings.Contains(r.Header.Get("Accept-Encoding"), "gzip") {
+			fn(w, r)
+			return
+		}
+		w.Header().Set("Content-Encoding", "gzip")
+		gz := gzip.NewWriter(w)
+		defer gz.Close()
+		gzr := gzipResponseWriter{Writer: gz, ResponseWriter: w}
+		fn(gzr, r)
+	}
+}