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small documentation update to outline caveat with SESSION_COOKIE_DOMAIN

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commit ae8fcedbc7694010490ac2b365b397e8e2e39b44 1 parent 9d6ecc6
Ryan West authored

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  1. 6  docs/ref/settings.txt
6  docs/ref/settings.txt
@@ -2287,6 +2287,12 @@ The domain to use for session cookies. Set this to a string such as
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 ``".example.com"`` (note the leading dot!) for cross-domain cookies, or use
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 ``None`` for a standard domain cookie.
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+Be cautious when updating this setting on a production site. If you update
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+this setting to enable cross-domain cookies on a site that previously used
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+standard domain cookies, existing user cookies will be set to the old
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+domain. This may result in them being unable to log in as long as these cookies
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+persist.
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+
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 .. setting:: SESSION_COOKIE_HTTPONLY
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 SESSION_COOKIE_HTTPONLY

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