ERROR: The requested URL could not be retrieved

# ERROR

## The requested URL could not be retrieved

Invalid Request error was encountered while trying to process the request:

>     %R

Some possible problems are:

- Missing or unknown request method.

- Missing URL.

- Missing HTTP Identifier (HTTP/1.0).

- Request is too large.

- Content-Length missing for POST or PUT requests.

- Illegal character in hostname; underscores are not allowed.

- HTTP/1.1 Expect: feature is being asked from an HTTP/1.0 software.

Your cache administrator is %w.