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I wonder how the search engines - Yahoo, bing, google ... - interpret the exclamation mark (!) in the url:

  • www.site.com/product!651031
  • www.site.com/category!651031

I could not find documentation on this topic

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    Documentation for URLs is here, for HTTP specifically, see here.
    – hakre
    Commented Jun 9, 2011 at 2:25

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You're probably meaning the thingy documented by Google. It's called hash fragments or hash bangs (among other names), and it's very bad UI practice -- amongst other reasons, because a URI is permanent, and this lands you with a single url for your entire site.

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  • I understand, but do not intend to do as twitter or facebook using /!#/ www.site.com/product!651031 this case would be a dynamic content-based ID 651031 I wonder if it would be interpreted as www.site.com/product/651031 thanks
    – Lelis
    Commented Jun 9, 2011 at 2:51
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    Yes, it's a valid url character. As is : which you occasionally find like /foo/page:2/
    – Denis de Bernardy
    Commented Jun 9, 2011 at 10:23

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