I need some explanation about my question.
Example on my header already added
<meta name="robots" content="noindex, nofollow" />
Should I add canonical tag again to my header?
<link rel=”canonical” href=”http://www.example.com/product.php?item=big-fish” />
Let me know :)
Update
we know canonical tag is currently also supported by google, yahoo and live search. How about noindex and nofollow? yahoo and live (bing) supported too?
Not much point is there? The search engine isn't going to index your page anyway!
Though I suppose if you're ever going to want it indexed in the future then it would be good practice, though only if the same page content is being accessed via different URLs.
You only need the 'canonical' tag if there is more than one way to address a page. For example, if 'http://www.example.com/products/big-fish' and 'http://www.example.com/product.php?item=big-fish' both point to the same page (ie. one is an alias for the other), use 'canonical'.
Since you're telling the crawler to not index and don't follow, I don't see why you should use a canonical.
You should use a canonical only if you have the same content under different URLs.
Google, Yahoo!, and Bing (Live) support noindex and nofollow in the meta directives.
noindex tells the search engines to not bother caching your page for inclusion in their results.
nofollow tells them that you don't want any of the links on the page to be followed.
Adding the canonical tag on the same page won't hurt, but effects are unknown unless you talk with one of the search engineers.