I just upgraded home assistant to run on https and now I am having trouble with iFrames loading. I am assuming that it is because I am trying to embed web pages running off a local server that are not using https. Is there a way to allow an http webpage to load in an iFrame even though HA is running over https?
Not http, no.
You can’t embed sites using HTTP if you are using HTTPS for your Home Assistant.
I guess you could generate self signed certificates for whatever webserver you have running.