MM-2033 fixes img showing infinity progress

api/file.go

@@ -347,6 +347,7 @@ func getFile(c *Context, w http.ResponseWriter, r *http.Request) {
 	}
 
 	w.Header().Set("Cache-Control", "max-age=2592000, public")
+	w.Header().Set("Content-Length", strconv.Itoa(len(f)))
 	w.Write(f)
 }
 

web/react/components/view_image.jsx

@@ -248,6 +248,7 @@ module.exports = React.createClass({
             // display a progress indicator when the preview for an image is still loading
             var percentage = Math.floor(this.state.progress[this.state.imgId]);
             if (percentage) {
+
                 content = (
                     <div>
                         <img className='loader-image' src='/static/images/load.gif' />