Form tag helper

Rendering form tag is also easy and does not require any extra work.

<form asp-controller="Home" asp-action="Index" asp-route-tenant="mycompany"></form>

If your host is http://mycompany.localhost:54575 will render

<form url="/" type="post">
</form>

when current host is different it will render

<form url="http://mycompany.localhost:54547" type="post">
</form>