Make sky_server include no-cache headers since we don't really want caching during development.

sky/tools/skygo/sky_server.go

 // Copyright (c) 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package main
 
 import (
     "flag"
     "fmt"
     "io/ioutil"
@@ skipping 10 matching lines @@
 
 func skyHandler(root string) http.Handler {
     return &skyHandlerRoot{root}
 }
 
 func (handler *skyHandlerRoot) ServeHTTP(w http.ResponseWriter, r *http.Request) {
     path := path.Join(handler.root, r.URL.Path)
     if strings.HasSuffix(path, ".sky") {
         w.Header().Set("Content-Type", "text/sky")
     }
+    w.Header().Set("Cache-Control", "no-cache")
     http.ServeFile(w, r, path)
 }
 
 func usage() {
     fmt.Fprintf(os.Stderr, "Usage: sky_server [flags] MOJO_SRC_ROOT PORT\n\n")
     fmt.Fprintf(os.Stderr, "launches a basic http server with mappings into the\n")
     fmt.Fprintf(os.Stderr, "mojo repository for framework/service paths.\n")
     fmt.Fprintf(os.Stderr, "[flags] MUST be before arguments, because go:flag.\n\n")
     flag.PrintDefaults()
     os.Exit(2)
@@ skipping 36 matching lines @@
         defer r.Body.Close()
         body, _ := ioutil.ReadAll(r.Body)
         w.Write(body)
     })
 
     addMapping("/gen/", genRoot)
     addMapping("/packages/", packageRoot)
 
     http.ListenAndServe(":" + port, nil)
 }