[openstreetmap/openstreetmap-website] Add profile-specific request parameters for Valhalla (Issue #7236)

[Nils]

nilsnolde left a comment (openstreetmap/openstreetmap-website#7236)

> I wouldn't be keen on having a lot of rules encoded on our end so that the routing decisions wind up being made by us rather than the router.

I get that. I'm open to dropping this issue too. do know, I feel lots of co-ownership for valhalla, I'll be the one supporting this if no one else (and @chrstnbwnkl is probably too). it's sadly what valhalla needs, it's just a different architecture than usual, the preferences are provided by the user, not by the router. and IMO that's _exactly_ how routing should be. it's also what everyone strives for! but can't, because their architecture doesn't allow for it. they rather go for the performance benefit of (mostly) pre-baked preferences. of course GH (and to some point OSRM MLD) is an exception, but last I checked their "flexible" mode is slow (though even more flexible than Valhalla). sorry for the digression, felt relevant.

> As I understand that ticket what you're proposing is that we would send a parameter when doing pedestrian routing telling Valhalla just to ignore all access restrictions?

no, I didn't actually say yet how I'd handle it. what I said was 

> that'd need some thought though

and I mean it. this will take one of us maintainers to solve. and it'll take a bit of time.

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