Issue argoproj#489 - Static assets are being browser cached between u…

…pgrades (argoproj#502)

server/server.go

@@ -63,6 +63,13 @@ var (
  ErrNoSession = status.Errorf(codes.Unauthenticated, "no session information")
 )
 
+var noCacheHeaders = map[string]string{
+ "Expires": time.Unix(0, 0).Format(time.RFC1123),
+ "Cache-Control": "no-cache, private, max-age=0",
+ "Pragma": "no-cache",
+ "X-Accel-Expires": "0",
+}
+
 var backoff = wait.Backoff{
  Steps: 5,
  Duration: 500 * time.Millisecond,
@@ -425,6 +432,9 @@ func (a *ArgoCDServer) newHTTPServer(ctx context.Context, port int) *http.Server
 
  // serve index.html for non file requests to support HTML5 History API
  if acceptHTML && !fileRequest && (request.Method == "GET" || request.Method == "HEAD") {
+ for k, v := range noCacheHeaders {
+ writer.Header().Set(k, v)
+ }
  http.ServeFile(writer, request, a.StaticAssetsDir+"/index.html")
  } else {
  http.ServeFile(writer, request, a.StaticAssetsDir+request.URL.Path)