Google is spidering adwords links, but oddly - generates 404 errors

Maybe this is common knowledge, but it was news to me.

[andye]

I'm running some adwords ads which link to URLs something like this:

/?source=whatever

and today I saw a 404 error because Googlebot requested:

/%3Fsrc%3Dwhatever

So, two interesting things:

- the URL is *only* used in my Adwords ads, so Google definitely use these as a source for spidering.

- something funny's going on with the character encoding. Apache should surely have converted %3Fsrc%3D to?src=, but didn't - I'm thinking maybe this is a bug in Googlebot, maybe the URL was encoded twice? I dunno.

Andy.