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About using canonical and robots.txt block

Discussion in 'White Hat SEO' started by dontgo, Jun 9, 2017.

  1. dontgo

    dontgo Newbie

    Joined:
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    Hi, again, gurus

    This time I want to ask when or under what circumstances should I use canonical tags for duplicated pages, and when to use robots.txt to block them?

    as an example:
    Assuming I have two versions of urls
    A : /shop/page***
    B : /sale/page***

    The pages have almost exact content and A is the main version I want.
    So should I use "rel=canonical" to point B to A; or should I just simply block /sale/ in robots.txt?

    Don't know if I express clearly enough, so forgive me for that, plz.

    Thanks in advance