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CMAKE_TLS_VERIFY
----------------
Specify the default value for the :command:`file(DOWNLOAD)` and
:command:`file(UPLOAD)` commands' ``TLS_VERIFY`` options.
If this variable is not set, the commands check the
:envvar:`CMAKE_TLS_VERIFY` environment variable.
If neither is set, the default is *off*.
This variable is also used by the :module:`ExternalProject` and
:module:`FetchContent` modules for internal calls to :command:`file(DOWNLOAD)`.
TLS verification can help provide confidence that one is connecting
to the desired server. When downloading known content, one should
also use file hashes to verify it.
.. code-block:: cmake
set(CMAKE_TLS_VERIFY TRUE)
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