In these 7 years program experiences, I often used the QUERY_STRING parameter. The active page needed use this QUERY_STRING parameter largely, It is also called "query parameter". Such as article.asp?id=52, main.php?violate=respond&aware=52&retail=75, etc., the parameters after the question mark. There are many sites use many query parameter in the Address Bar, make the URL longer. Actually some are not necessary, and some are necessary. The unnecessary query parameter, just works for adorning the URL, these noneffective query parameters do not affect the run of program.

The query parameters may reduce largely, such as the documents of Blog and forum. In a site, the approach of differentiating 2 articles is that as the URL above, article.asp?id=52 or article.php?id=495, differentiate by the ?id=. All of the other parameters, may write in the database or Cookies. Because Apache provides the .htaccess, the URL may use the Rewrite module or 404 error, realise that the URL becomes static. The query parameters may write in the database or Cookies, many necessary parameters write on the Address Bar by the connective symbols / or -.

For the immovable links of documents, you may reduce the QUERY_STRING parameters as possible. For the active URLs of search or query which submited by the users, the QUERY_STRING parameters may write on the Address Bar.

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