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I get this error on my Facebook App tab - illegal body tag in the fb: tab-position section

I am using IIS and have heard that I may need to configure IIS to accept a request to send messages. Someone can get me through this. The application works just fine as a stand-alone, only when the tab is displayed, that the problem occurs and I get the above error.

I have a full understanding of postbackURL and tab url, as that is not a problem.

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I don't know if this helps at all, but I spent the whole day tapping my head on a similar issue. Canvas (IFRAME) works fine. Url apps.facebook.com/appname/tab/creates a page on its own, but the tab does not work, despite the fact that the canvas URL is the correct apps.facebook.com/appname and the tab is / tab /

In the end, I traced a problem with setting up fake protection in my application, which checked all incoming requests. Thus, even though the messages were accepted, the application tested them to protect fakes, which, obviously, they did not leave Facebook.

I skipped this for the tab only and everything worked fine. Now I do not know that you are an environment, but there may be something that will help you. Hope so. Good luck.

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, IIS? , FBML. <body> FBML.

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Source: https://habr.com/ru/post/1759419/

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