Symfony2 dynamic route query params (sef) and more than 255 chars in url

Question

I'm trying to create search filters that vary depending on object category. I need to show all of them in URL, even if it takes more than 255 chars and, to be honest, I'm lost.

I found 2 working examples: PC componentes

Idealista

What I have done is to create 3 routes in order to pass an ad type, property type, state, locality and a district. The first 3 parameters are always required and in this cases I know exactly the params order:

tpl_search_adtype_type_state:
    path: /{adType}-{propertyType}-{state}/page-{page}
    defaults: { _controller: Bundle:Controller:action1, page: 1 }

tpl_search_adtype_type_state_locality:
    path: /{adType}-{propertyType}-{state}/{locality}/page-{page}
    defaults: { _controller: Bundle:Controller:action2, page: 1 }

tpl_search_adtype_type_state_locality_district:
    path: /{adType}-{propertyType}-{state}/{locality}/{district}/page-{page}
    defaults: { _controller: Bundle:Controller:action3, page: 1 }

An example route 1 would be: /rent-houses-madrid/ An example route 2 would be: /rent-houses-madrid/madrid/ An example route 3 would be: /rent-houses-madrid/madrid/city-center/

Now over these routes I need to add filter params like:

Route 1:

/rent-houses-madrid/min-price-100/max-price-5000/min-rooms-2/max-rooms-5/

But not all params should be there, another example would be:

/rent-houses-madrid/max-price-1000/min-rooms-2/min-toilets-2/

Any idea about how to achieve this in symfony2?

Thanks.