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answers:

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Are the following opening/closing tags necessary for .htaccess mod_rewrite's? I've had .htaccess working without those, but just checking up on htaccess tutorials, many include this tag.

<IfModule mod_rewrite.c> ... </IfModule>
A: 

They are not necessary for mod_rewrite, as unknown directives are not interpreted, so it is more or less a style thing.

The tag can also used to perform test for not available modules with <IfModule !mod_rewrite.c>, so that you can use some other directives in that case.

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