sharepoint http iFrame
Site Settings -> HTML Field Security
Use this page to control the security settings for HTML fields under this site collection
Allow external iframes
Specify whether contributors can insert external iframes in HTML fields and Embed web parts on pages in this site. Iframes are commonly used on Web pages to show dynamic content from other web sites, like directions from a mapping site, or a video from a video site.
When using the list of allowed domains, note that all subdomains of the allowed domains are automatically trusted.
These settings do not affect content placed in scriptable Web Parts. Users who can add or edit scriptable Web Parts will be able to insert iframes pointing to any domain, regardless of the settings on this page.
Using the setting: Allow contributors to insert iframes only from the following domains:
when I add http://192.168.178.131/
and set up a page with iFrame:
<iframe width="700" height="270" src="//192.168.178.131/main.html?id=1&playtype=fv?user=USERNAME&pwd=123456" frameborder="4" allowfullscreen=""></iframe>
sharepoint immediately converts http://192.168.178.131 to https://192.168.178.131 and therefore shows "This site is not available. Search Bing for https://192.168.178.131"
And Message comes:
We only support embedding content from secure websites (whose addresses start with "https"). If it's important to embed content from non-secure sites, please send us feedback.
How can we use a normal URL (non https) as iFrame?
Many thanks in advance.

7 comments
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Jeff commented
I am trying to embed an internal http:// site in an iframe but get the following response; "We only support embedding content from secure websites (their addresses start with https.) If it's important to embed content from unsecured websites, please send us feedback." It is important and I would like to send feedback. Where do I send feedback? Please help.
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Sara commented
Same issue here! We have an intranet which we can't connect, since it is http. The documents in the intranet are quality related, and it would become a quality issue to duplicate the documents.
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Guillaume commented
Same issue here. We have a local webserver for local data and I can't integrate the iframe because it's not HTTPS. The administrators should be able to overpass this limitation. Big issue here !
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Anonymous commented
I'm having the same problem, it doesn't make sense, I, as an administrator, have to be autonomous to direct an iframe wherever I want! SharePoint is a tool that would be much more useful if it gave your administrators this kind of autonomy! Revolted!
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Derek commented
We have SharePoint Server 2019 on-premises, and I think it's ridiculous that even with a local farm that has nothing to do with Office 365, we still cannot embed http:// URLs from within our network.
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Pop Anisia Alexandra commented
Love the fact that are so "many" answers. I have been trying this as well with no luck. Have you found a workaround for this? Thank you.
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Kimberly Wimer commented
So my question is slight different, I have an external site that want to user our SharePoint URL as in their Iframe, but get an error message: SPonline refused to connect. Everything I read says that we can not do this but I wanted to know anyone knows if this is true.