1

Is it considered bad practice for a canonical link on a page return a 302 redirect to a login page?

Example:

If https://foo.com/bar/slug?version=2019-02-01&signature=XXX returns

HTTP/1.1 200 OK

<!DOCTYPE html>
<html>
<head>
  <link rel="canonical" href="https://foo.com/bar/slug" />
</head>
<body>
...
</body>
</html>

but https://foo.com/bar/slug returns

HTTP/1.1 302 Found
Location: https://foo.com/login?ReturnUrl=%2Fbar%2Fslug

A) Is this considered bad practice?

B) If the url with the querystring returns the 200 will it's content still be indexed if a search engine crawls it?

c) If a search engine crawls multiple variants of the querystring version (/bar/slug?version=2019-02-01&signature=XXX, /bar/slug?version=2019-02-02&signature=YYY, /bar/slug?version=2019-02-03&signature=ZZZ) will search engines only "keep" the most recent version (assuming I set Last-Modified headers to match the date in the querystring version and they all have the same canonical link) indexed?

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