ERROR
The requested URL could not be retrieved

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

    GET / HTTP/1.1
    Host: localhost:3128
    User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:5.0) Gecko/20100101 Firefox/5.0
    Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
    Accept-Language: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
    Accept-Encoding: gzip, deflate
    Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.7
    Connection: keep-alive
    Cache-Control: max-age=0


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.