Welcome to the Q&A Forum

Here's an example:

I get a 404 error for this:

http://webcache.googleusercontent.com/search?q=cache:http://www.qjamba.com/restaurants-coupons/ferguson/mo/all

But a search for qjamba restaurant coupons gives a clear result as does this:

site:http://www.qjamba.com/restaurants-coupons/ferguson/mo/all

What is going on?  How can this page be indexed but not in the Google cache?

I should make clear that the page is not showing up with any kind of error in webmaster tools, and Google has been crawling pages just fine.  This particular page was fetched by Google yesterday with no problems, and even crawled again twice today by Google  Yet, no cache.

Great answer Monica -- thank you!

It occurs to me that a malicious program could set up thousands of links to dummy pages on a website:

www.mysite.com/dynamicpage/dummy123

www.mysite.com/dynamicpage/dummy456

etc..

How is this normally handled?  Does a developer have to look at all the parameters to see if they are valid and if not, automatically create a 301 redirect or 404 not found? This requires a table lookup of acceptable url parameters for all new visitors.

I was thinking that bad url names would be rare so it would be ok to just stop the program with a message, until I realized someone could intentionally set up links to non existent pages on a site.