Get base URL of the current Portal page using liquid code

Hi

I have a portal site. i tried to get the base url i.e: abc-dev.powerappsportals.com/ 

I am on the index page (refer to image 1). I need to get the base URL using liquid code. i tried with {{ page.url}} , and {{ page.url | base}}.  it only returns "/index" for the example (refer to image 1).  Please advise how i can get the base URL. Thank you, Siva

image 1