What type of HTTP Redirect Rules does Marketo use when you setup a redirect rule in Admin > Landing Pages?
Solution
Internal Pages such as landing pages hosted on Marketo will use a HTTP 301 Redirect
External pages & non landing page URL's (when using "non-Marketo landing page") used in the redirect rule will utilize a HTTP 302 Redirect:
Branding links do not use an HTTP Redirect and use a script-based redirect on the Branded links page.
Example: Email branding link - go.mybranddomain.com/ABCDEFIlB0ETg0X063WLL1 is a Marketo hosted page that utilizes a script to redirect & point to www.thetargeturlinanemail.com