Is it possible/allowed to create an HTML form on an HTTPS site that submits its content to a completely different (even domain is different) HTTPS site or are there issues, i.e. the browser shows an alert?
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Possible duplicate of [Cross Domain Form POSTing](http://stackoverflow.com/questions/11423682/cross-domain-form-posting) – shaochuancs Mar 28 '17 at 13:12
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It is a Mixed Content
if you have a non SSL form action
The page at secured page was loaded over a secure connection, but contains a form which targets an insecure endpoint. This endpoint should be made available over a secure connection.
It makes a warning on a secured page

Farhad Sakhaei
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Sorry, I didn't explained me too well. Both sites are HTTPS sites but they are different sites, with different domains. I do know that an HTTPS form submitting to an HTTP action gives a browser warning. – Cristian Veronesi Mar 28 '17 at 13:18
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