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CMAKE_TLS_VERIFY
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----------------
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Specify the default value for the :command:`file(DOWNLOAD)` and
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:command:`file(UPLOAD)` commands' ``TLS_VERIFY`` options.
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If this variable is not set, the commands check the
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:envvar:`CMAKE_TLS_VERIFY` environment variable.
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If neither is set, the default is *on*.
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.. versionchanged:: 3.31
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The default is on. Previously, the default was off.
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Users may set the :envvar:`CMAKE_TLS_VERIFY` environment
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variable to ``0`` to restore the old default.
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This variable is also used by the :module:`ExternalProject` and
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:module:`FetchContent` modules for internal calls to :command:`file(DOWNLOAD)`.
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TLS verification can help provide confidence that one is connecting
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to the desired server. When downloading known content, one should
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also use file hashes to verify it.
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.. code-block:: cmake
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set(CMAKE_TLS_VERIFY TRUE)
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