# Replace `self.path` parameters with concrete values from the `request` URI.
	fun resolve_path(request: HttpRequest): nullable String do
		if pattern_parts.is_empty then return self.path
		var path = "/"
		for part in pattern_parts do
			if part isa UriString then
				path /= part.string
			else if part isa UriParam then
				path /= request.param(part.name) or else part.name
			end
		end
		return path
	end