Client authenticates to the server. General format of the message is the same as used in FTP protocol, so message identification by the client should be performed by the numeric response code. All other responses are negative. Otherwise, skips to the step 7. Login sequence may fail because of wrong username, password, application name, mismatched username and application name, application instances limit and internal error.
Failure causes client to be disconnected.
Currently all lines in parameters list have two parameters - key and value. Value is the parsed script name from the HTTP request resolved to the local absolute pathname. It isn't parsed in any way and isn't null-terminated. No data, message means that the response for some HTTP request with provided ID is finished. Server doesn't parse the data.