Hi, I have used tinywebserver running on the core and code in a < html>< iframe>…< /iframe> where the source of the iframe would be your https: url.
The problem I ran in to is google’s android browser will not load an iframe unless the source page (core) and the frame page (google docs) are both https:.
Take a look at this page and you will see discussion of Tinywebserver & my examples. I owe credit to @BDub and @bko and @Dave for they helped me with the same question.
There are other examples. let me know if you need additional links.