Js has this limitation, but it can be overwritten by API server settings.
Dash is one of the few altcoins for which I cannot find a public API that works with Javascript. This means that you cannot do a hybrid mobile application (in cordova framework in my case) involving Dash in general. That's not a good thing for an altcoin's ecosystem I think.
I guess you have tried all of these already?
https://www.dash.org/blockchain-explorers/