Problem integrating with prerender.io (PHP lavarel prerender middleware)

[kaiwangjimmy]

Hi,

I am trying to set up prerender.io for our website. But I have problem integrating with service.prerender.io.
I am using PHP lavarel 4. I have already set up the PHP lavarel prerender middleware(version 1.0).

I also set up the code prerender server running as http://localhost:3000
The url of our web app is like: https://example.com/#!/support (we use hashbang #!)

When I test it locally, it works well. When I get access to https://localhost/?escaped_fragment=/support in browser, it returns static HTML. and the log in nodejs console looks good.

Then I change 'prerender_url' => 'https://service.prerender.io', and set up 'prerender_token' and deployed it to amazon web service.
The web server is behind load balancer(ELB).

The following url also works fine
https://service.prerender.io/https://example.com/?_escaped_fragment_=/support
I can get back static html.

But if I load in chrome
https://example.com/?_escaped_fragment_=/support

From Chrome's Network console, I see finally 502 http code returned and I cannot see the web page.
But in prerender.io web console, I can see that page is cached successfully and from Crawl Stats, I see that URL and the status Code is 200.
Thanks,

[kaiwangjimmy]

The loading of https://example.com/?_escaped_fragment_=/support takes around 13 seconds.