See this site https://www.majorbuild.com/ in Chrome Browser (I tested Desktop 
and Mobile both failed), it used to work for weeks but today I noticed the site 
appears blank. From Chrome console there's an error: Failed to load resource: 
net::ERR_SPDY_PROTOCOL_ERROR

I suspect something's wrong with AppEngine as error started while I was not 
working on it.

Site was build in polymer and I have configured in app.yaml to serve homepage 
with HTTP/2 Server Push: 

handlers:
- url: /
  static_files: index.html
  upload: index.html
  secure: always
  redirect_http_response_code: 301
  http_headers:
    Cache-control: no-cache
    Link: </src/my-app.html>; rel=preload; 
as=document,</bower_components/polymer/polymer.html>; rel=preload; 
as=document,</bower_components/polymer/polymer-mini.html>; rel=preload; 
as=document,</bower_components/polymer/polymer-micro.html>; rel=preload; 
as=document,</bower_components/iron-flex-layout/iron-flex-layout.html>; 
rel=preload; as=document

Site still works in Edge / IE, just not Chrome (probably only Chrome works with 
SPDY / HTTP2?)

I wonder if anyone also using HTTP/2 Server Push in AppEngine Standard and got 
the same issue?

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