It's quite hard to correctly create and maintain rewrites that change dynamic URLs to static-looking URLs. It's much safer to serve us the original dynamic URL and let us handle the problem of detecting and avoiding problematic parameters. If you want to rewrite your URL, please remove unnecessary parameters while maintaining a dynamic-looking URL. If you want to serve a static URL instead of a dynamic URL you should create a static equivalent of your content.

language=en - indicates the language of the article

answer=3 - the article has the number 3

sid=8971298178906 - the session ID number is 8971298178906

query=URL - the query with which the article was found is [URL]

www.example.com/article/bin/answer.foo/en/3/98971298178906/URL

www.example.com/article/bin/answer.foo/language=en/answer=3/

sid=98971298178906/query=URL

sid=98971298178906/query=URL www.example.com/article/bin/answer.foo/language/en/answer/3/

sid/98971298178906/query/URL

sid/98971298178906/query/URL www.example.com/article/bin/answer.foo/en,3,98971298178906,URL

www.example.com/article/bin/ answer.foo/en/3

www.example.com/article/bin/answer.foo?language=en&answer=3

A static URL is one that does not change, so it typically does not contain any url parameters. It can look like this: http://www.example.com/archive/january.htm. You can search for static URLs on Google by typing filetype:htm in the search field. Updating these kinds of pages can be time consuming, especially if the amount of information grows quickly, since every single page has to be hard-coded. This is why webmasters who deal with large, frequently updated sites like online shops, forum communities, blogs or content management systems may use dynamic URLs.If the content of a site is stored in a database and pulled for display on pages on demand, dynamic URLs maybe used. In that case the site serves basically as a template for the content. Usually, a dynamic URL would look something like this: http://code.google.com/p/google-checkout-php-sample-code/issues/detail?id=31 . You can spot dynamic URLs by looking for characters like: ? = &. Dynamic URLs have the disadvantage that different URLs can have the same content. So different users might link to URLs with different parameters which have the same content. That's one reason why webmasters sometimes want to rewrite their URLs to static ones.Following are some key points you should keep in mind while dealing with dynamic URLs:We've come across many webmasters who, like our friend, believed that static or static-looking URLs were an advantage for indexing and ranking their sites. This is based on the presumption that search engines have issues with crawling and analyzing URLs that include session IDs or source trackers. However, as a matter of fact, we at Google have made some progress in both areas. While static URLs might have a slight advantage in terms of clickthrough rates because users can easily read the urls, the decision to use database-driven websites does not imply a significant disadvantage in terms of indexing and ranking. Providing search engines with dynamic URLs should be favored over hiding parameters to make them look static.We can crawl dynamic URLs and interpret the different parameters. We might have problems crawling and ranking your dynamic URLs if you try to make your urls look static and in the process hide parameters which offer the Googlebot valuable information. One recommendation is to. It's always advisable to use static content with static URLs as much as possible, but in cases where you decide to use dynamic content, you should give us the possibility to analyze your URL structure and not remove information by hiding parameters and making them look static.There is no limit on the number of parameters, but a good rule of thumb would be to(this applies to all URLs, whether static or dynamic). You may be able to remove some parameters which aren't essential for Googlebot and offer your users a nice looking dynamic URL. If you are not able to figure out which parameters to remove, we'd advise you to serve us all the parameters in your dynamic URL and our system will figure out which ones do not matter. Hiding your parameters keeps us from analyzing your URLs properly and we won't be able to recognize the parameters as such, which could cause a loss of valuable information.That's our recommendation, unless your rewrites are limited to removing unnecessary parameters, or you are very diligent in removing all parameters that could cause problems. If you transform your dynamic URL to make it look static you should be aware that we might not be able to interpret the information correctly in all cases. If you want to serve a static equivalent of your site, you might want to consider transforming the underlying content by serving a replacement which is truly static. One example would be to generate files for all the paths and make them accessible somewhere on your site. However, if you're using URL rewriting (rather than making a copy of the content) to produce static-looking URLs from a dynamic site, you could be doing harm rather than good. Feel free to serve us your standard dynamic URL and we will automatically find the parameters which are unnecessary.If you have a dynamic URL which is in the standard format like foo?key1=value&key2=value2 we recommend that you leave the url unchanged, and Google will determine which parameters can be removed; or you could remove uncessary parameters for your users. Be careful that you only remove parameters which do not matter. Here's an example of a URL with a couple of parameters:www.example.com/article/bin/answer.foo?language=en&answer=3&sid=98971298178906&query=URLNot all of these parameters offer additional information. So rewriting the URL to www.example.com/article/bin/answer.foo?language=en&answer=3 probably would not cause any problems as all irrelevant parameters are removed.The following are some examples of static-looking URLs which may cause more crawling problems than serving the dynamic URL without rewriting:Rewriting your dynamic URL to one of these examples could cause us to crawl the same piece of content needlessly via many different URLs with varying values for session IDs () and. These forms make it difficult for us to understand thatandhave nothing to do with the actual content which is returned via this URL. However, here's an example of a rewrite where all irrelevant parameters have been removed:Although we are able to process this URL correctly, we would still discourage you from using this rewrite as it is hard to maintain and needs to be updated as soon as a new parameter is added to the original dynamic URL. Failure to do this would again result in a static looking URL which is hiding parameters. So the best solution is often to keep your dynamic URLs as they are. Or, if you remove irrelevant parameters, bear in mind to leave the URL dynamic as the above example of a rewritten URL shows: