Facebook using content behind proxy

I’ve set up an Asp.Net website as https://mywebsite.com. I’ve also got a subdomained blog, http://blog.mywebsite.com which resolves to https://mywebsite.com/blog through a reverse proxy.

The reverse proxy has been set up using Application Request Routing and the blog is hosted on a different server using WordPress.

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All is well except for Facebook, which insists on posting my content under the blog subdomain, even when I’m using my alias. I’ve also made changes to WP-config, so that all urls are rendered as https://mywebsite.com/blog.

I’ve Googled this to death, but the space is filled with other crud about circumventing banned accounts etc.

Anyone have any ideas as to how I can work around this and get my posts posted under the url I enter? I’m manually posting.

Thanks in advance.

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