How to redirect visitor with url masking?

Hi, I have a wix site on a business plan with my own domain name.
I also have an app server running a webapp which is referenced by a subdomain of my domain name.
I have set up a router which takes a url like www.mydomain/myrouter/?param=data
My router converts that call into: ( https://mysubdomain.mydomain/?param=data, “301”)
The above all works fine - except the browser shows the new subdomain url in the address bar, but I want the address bar to remain as per the call to the router. My domain is SSL certed.
Is this doable??

Hello.

You can use the WixRouterSitemap to set the page title as shown in our API here:
https://www.wix.com/corvid/reference/wix-router.WixRouterSitemapEntry.html#title

Good luck!