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7 changes: 5 additions & 2 deletions user_guide_src/source/general/common_functions.rst
Original file line number Diff line number Diff line change
Expand Up @@ -266,8 +266,11 @@ Miscellaneous Functions

Checks to see if the page is currently being accessed via HTTPS. If it is, then
nothing happens. If it is not, then the user is redirected back to the current URI
but through HTTPS. Will set the HTTP Strict Transport Security header, which instructs
modern browsers to automatically modify any HTTP requests to HTTPS requests for the $duration.
but through HTTPS. Will set the HTTP Strict Transport Security (HTST) header, which instructs
modern browsers to automatically modify any HTTP requests to HTTPS requests for the ``$duration``.

.. note:: This function is also used when you set
``Config\App:$forceGlobalSecureRequests`` to true.

.. php:function:: function_usable($function_name)

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