This feature is experimental. Please share your experiences so we know what to keep or change.
Builds a URL string from the given base URL and this up.Params instance as a query string.
up.Params
The base URL may or may not already contain a query string. The additional query string will be joined with & or ? accordingly.
&
?
The base URL that will be prepended to this up.Params object as a query string.
The built URL.
