Prerender io java wrong route - angularjs

Question

I am having a problem with prerender.io. It works just fine if I am using node/express on localhost, but when I am trying to make it work with java (https://github.com/greengerong/prerender-java/) on google app engine it re-routes automatically.
When I write this into my browser and hit enter,
http://www.example.com/?_escaped_fragment_=/browse/761238167868/
It redirects automatically to
http://www.example.com/?_escaped_fragment_=/browse/761238167868#!/browse
In app.js I have the following:
module.config(['$routeProvider','$locationProvider', function($routeProvider, $locationProvider) {
$routeProvider.when('/browse', {
templateUrl: 'views/browse.html'
//a lot of .when() ....
}).otherwise({redirectTo: '/browse'});
I believe it is a problem with the app engine server or the middleware installation, because it works just fine with node/express.
Do I need to rewrite something to make app engine handle hashbangs (#!) or something?
Here's my web.xml:
<filter>
<filter-name>prerender</filter-name>
<filter-class>com.github.greengerong.PreRenderSEOFilter</filter-class>
<init-param>
<param-name>crawlerUserAgents</param-name>
<param-value>FacebookExternalHit</param-value>
</init-param>
<init-param>
<param-name>crawlerUserAgents</param-name>
<param-value>facebookexternalhit</param-value>
</init-param>
<init-param>
<param-name>crawlerUserAgents</param-name>
<param-value>facebookexternalhit/1.0</param-value>
</init-param>
<init-param>
<param-name>crawlerUserAgents</param-name>
<param-value>facebookexternalhit/1.1</param-value>
</init-param>
<init-param>
<param-name>crawlerUserAgents</param-name>
<param-value>Facebot</param-value>
</init-param>
<init-param>
<param-name>prerenderToken</param-name>
<param-value>mytoken</param-value>
</init-param>
</filter>
<filter-mapping>
<filter-name>prerender</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>