SEO 101 - 1 of 13 common SEO Roadblocks (Dynamic URLs)

Dynamic URLs

There are two types of URLs: dynamic URLs and static URLs. The difference between the two is the dynamic URLs have parameters passed to them through the web page address that usually cause the page to behave differently depending on the value of the parameters passed.

Dynamic URLs are web page addresses followed by a "?" and then have parameters tacked on the end such as "ProductID=1." Additional parameters can then be added to the web page address by separating with an ampersand. For example:

http://search.msn.com/results.aspx?q=param1&mkt=en-US&form=QBRE

This URL above consist of the following parts:

http: The protocol

search.msn.com: The host you want to access

results.aspx: The script name

?: Separates the script name and host name from the parameters

q=param1: Parameter 1 – q is the request querystring variable and param1 is the value associated with that querystring variable

&: Allows additional parameters to be added

Mkt=en-US:   Parameter 2

&: Another parameter separator

Form=QBRE: Parameter 3

Why Does it Matter?

In the early days of the Internet (circa 1990’s), the search engine spiders had trouble handling parameters. Poor coding or unscrupulous webmasters could provide endless loops for the search engine spiders to be caught in, indexing thousands of near identical pages.

A common problem with dynamic URLs is when the page references itself Incorrectly and adds additional copied parameters. For example, if the original page was:

http://www.mysite.com/search.php?param1=1

Then sometimes poor coding could result in the page referencing itself as:

http://www.mysite.com/search.php?param1=1&param1=1

This is a perfectly valid URL, so the search engines would index it, and then it in turn would reference itself as:

http://www.mysite.com/search.php?param1=1&param1=1&param1=1

And so on. To stop this from filling the search engine index with thousands of duplicate pages, the search engine spiders would ignore URLs containing parameters. This led to most database-driven sites being totally ignored by the search engines.

Today, the search engine spiders have worked out ways to handle parameters on URLs. However, their support is still limited. Google recommends keeping the number of parameters to three or less. The other search engines have similar recommendations. Most practitioners feel uncomfortable when the number of parameters goes to two, and definitely avoid the third parameter unless the workaround is horrendously ugly. In that case, one might accept it and monitor the number of pages indexed.

Thanks to SEMPO institute for this information.

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