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 METADATA
 ========
 
 Applications can provide "metadata" to the workers. Metadata can influence
 the behavior of a worker and is usually protocol dependent. MetaData consists
 of two strings: a "key" and a "value".
 
 Any meta data whose "key" starts with the keywords {internal~currenthost} and
 "{internal~allhosts}" will be treated as internal metadata and will not be made
 available to client applications. Instead all such meta-data will be stored and
 sent back to the appropriate KIO workers along with the other regular metadata values.
 
 Use "{internal~currenthost}" to make the internal metadata available to all
 KIO workers of the same protocol and host as the workers that generated it. If
 you do not want to restrict the availability of the internal metadata to only
 the current host, then use {internal~allhosts}. In either case the internal
 metadata follows the rules of the regular metadata and therefore cannot be sent
 from one protocol such as "http" to a completely different one like "ftp".
 
 Please note that when internal meta-data values are sent back to KIO workers, the
 keyword used to mark them internal will be stripped from the key name.
 
 The following keys are currently in use:
 
 Key             Value(s)        Description
 ----            --------        -----------
 
 referrer        string          The URL from which the request originates. (read by http)
 
 accept          string          List of MIME types to accept separated by a ", ". (read by http)
 
 responsecode    string          Original response code of the web server. (set by http)
 
 UserAgent       string          The user agent name to send to remote host (read by http)
 
 content-type    string          The content type of the data to be uploaded (read and set by http)
 
 window-id       number          winId() of the window the request is associated with.
 
 range-start     number          Try to get the file starting at the given offset (set by file_copy when finding a .part file,
                                                                                   but can also be set by apps.)
 
 range-end       number          Try to get the file until at the given offset (not set in kdelibs; handled by kio_http).
 
 resume          number          Deprecated compatibility name for range-start
 resume_until    number          Deprecated compatibility name for range-end
 
 content-disposition-type        string Type of Content-Disposition from a HTTP Header Response.
 content-disposition-*           any other valid value sent in a Content-Disposition header (e.g. filename)
 
 cookies         "manual"        Cookies set in "setcookies" are send, received cookies are reported
                                 via "setcookies".
                 "none"          No cookies are sent, received cookies are discarded (default).
 
 setcookies      string          Used to send/receive HTTP cookies when "cookies" is set to "manual".
 
 errorPage       bool            Flag that indicates that an errorPage() is preferred over an error().                                      (default:true)
 
 no-www-auth     bool            Flag that indicates that no HTTP WWW authentication attempts should be made.
 no-proxy-auth   bool            Flag that indicates that no HTTP proxy authentication attempts should be made.
 no-auth-prompt  bool            Flag that indicates that only cached authentication tokens should be used.
 
 ssl_no_ui       bool            Flag to tell TCPworkerBase that no user interaction should take place. Instead of asking security questions the connection will silently fail. This is of particular use to favicon code. (default: false)
 
 PropagateHttpHeader     bool    Whether HTTP headers should be send back (read by http)
 
 HTTP-Headers            string  The HTTP headers, concatenated, \n delimited (set by http)
                                 Requires PropagateHttpHeader to be set.
 
 customHTTPHeader        string  Custom HTTP headers to add to the request (read by http)
 
 UseProxy                string  URL representing the proxy settings (read by http)
 ProxyUrls               string  a comma separated list of proxy urls. The first url in this list matches one set in "UseProxy".
 
 textmode                bool    When true, switches FTP up/downloads to ascii transfer mode (read by ftp)
 
 recurse                 bool    When true, del() will be able to delete non-empty directories.  (read by file)
                                 Otherwise, del() is supposed to give an error on non-empty directories.
 
 DefaultRemoteProtocol   string  Protocol to redirect file://<hostname>/ URLs to, default is "smb" (read by file)
 redirect-to-get         bool    If "true", changes a redrirection request to a GET operation regardless of the original operation.
 
 ** NOTE: Anything in quotes ("") under Value(s) indicates literal value.
 
 
 Examples:
 
 E.g. the following disables cookies:
 job = KIO::get( QUrl("http://www.kde.org") );
 job->addMetaData("cookies", "none");
 
 If you want to handle cookies yourself, you can do:
 job = KIO::get( QUrl("http://www.kde.org") );
 job->addMetaData("cookies", "manual");
 job->addMetaData("setcookies", "Cookie: foo=bar; gnat=gnork");
 
 The above sends two cookies along with the request, any cookies send back by
 the server can be retrieved with job->queryMetaData("cookies") after
 receiving the mimetype() signal or when the job is finished.
 
 The cookiejar is not used in this case.