The problem with CORS in the iframe?

There are server a and server B. I appeal to the server and get a page in ifram. Page works, but access from And I can not in frame to. What to do ? (All the headers are there)
Even tried to return just a string. And to render in a frame. And nothing. Again, a mistake. How so ? I took just a line from myself already at render
June 10th 19 at 14:33
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