Googlebot keeps throwing MethodNotAllowed errors in Application#index

Hi guys,

Does anyone know how to solve this problem? As long as my app has
lived, Googlebot (IP brings up the
ActionController::MethodNotAllowed error several times a week, saying
"Only put requests are allowed." How is Googlebot even accessing
Application#index (I assume this is the application controller), and
why are only post requests allowed? Thanks.

Rails 2.3.2

What is the exact url that it is trying to access?