How to check current URL for endpoint in a template file?

Check out this tutorial for query variables: http://www.rlmseo.com/blog/passing-get-query-string-parameters-in-wordpress-url/.

Essentially what you will be adding is a custom query variable with value either A or B to show different content. I.e. /author/username/contentA is actually index.php?author=username&customqueryvar=contentA.

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