public String getAuthType()
Returns the name of the authentication scheme used to protect
the servlet. All servlet containers support basic, form and client 
certificate authentication, and may additionally support digest 
authentication.
If the servlet is not authenticated null is returned. 

Same as the value of the CGI variable AUTH_TYPE.

 public String getContextPath()
Returns the portion of the request URI that indicates the context
of the request.  The context path always comes first in a request
URI.  The path starts with a "/" character but does not end with a "/"
character.  For servlets in the default (root) context, this method
returns "". The container does not decode this string.

 public Cookie[] getCookies()
Returns an array containing all of the Cookie
objects the client sent with this request.
This method returns null if no cookies were sent.

 public long getDateHeader(String name)
Returns the value of the specified request header
as a long value that represents a 
Date object. Use this method with
headers that contain dates, such as
If-Modified-Since. 

The date is returned as
the number of milliseconds since January 1, 1970 GMT.
The header name is case insensitive.

If the request did not have a header of the
specified name, this method returns -1. If the header
can't be converted to a date, the method throws
an IllegalArgumentException.

 public String getHeader(String name)
Returns the value of the specified request header
as a String. If the request did not include a header
of the specified name, this method returns null.
If there are multiple headers with the same name, this method
returns the first head in the request.
The header name is case insensitive. You can use
this method with any request header.

 public Enumeration getHeaderNames()
Returns an enumeration of all the header names
this request contains. If the request has no
headers, this method returns an empty enumeration.

Some servlet containers do not allow
servlets to access headers using this method, in
which case this method returns null

 public Enumeration getHeaders(String name)
Returns all the values of the specified request header
as an Enumeration of String objects.

Some headers, such as Accept-Language can be sent
by clients as several headers each with a different value rather than
sending the header as a comma separated list.

If the request did not include any headers
of the specified name, this method returns an empty
Enumeration.
The header name is case insensitive. You can use
this method with any request header.

 public int getIntHeader(String name)
Returns the value of the specified request header
as an int. If the request does not have a header
of the specified name, this method returns -1. If the
header cannot be converted to an integer, this method
throws a NumberFormatException.

The header name is case insensitive.

 public String getMethod()
Returns the name of the HTTP method with which this 
request was made, for example, GET, POST, or PUT.
Same as the value of the CGI variable REQUEST_METHOD.

 public String getPathInfo()
Returns any extra path information associated with
the URL the client sent when it made this request.
The extra path information follows the servlet path
but precedes the query string and will start with
a "/" character.

This method returns null if there
was no extra path information.

Same as the value of the CGI variable PATH_INFO.

 public String getPathTranslated()
Returns any extra path information after the servlet name
but before the query string, and translates it to a real
path. Same as the value of the CGI variable PATH_TRANSLATED.

If the URL does not have any extra path information,
this method returns null or the servlet container
cannot translate the virtual path to a real path for any reason
(such as when the web application is executed from an archive).

The web container does not decode this string.

 public String getQueryString()
Returns the query string that is contained in the request
URL after the path. This method returns null
if the URL does not have a query string. Same as the value
of the CGI variable QUERY_STRING.

 public String getRemoteUser()
Returns the login of the user making this request, if the
user has been authenticated, or null if the user 
has not been authenticated.
Whether the user name is sent with each subsequent request
depends on the browser and type of authentication. Same as the 
value of the CGI variable REMOTE_USER.

 public String getRequestURI()
Returns the part of this request's URL from the protocol
name up to the query string in the first line of the HTTP request.
The web container does not decode this String.
For example:



First line of HTTP request      
     Returned Value
POST /some/path.html HTTP/1.1
/some/path.html
GET http://foo.bar/a.html HTTP/1.0
/a.html
HEAD /xyz?a=b HTTP/1.1
/xyz


To reconstruct an URL with a scheme and host, use
HttpUtils#getRequestURL .

 public StringBuffer getRequestURL()
Reconstructs the URL the client used to make the request.
The returned URL contains a protocol, server name, port
number, and server path, but it does not include query
string parameters.

Because this method returns a StringBuffer,
not a string, you can modify the URL easily, for example,
to append query parameters.

This method is useful for creating redirect messages
and for reporting errors.

 public String getRequestedSessionId()
Returns the session ID specified by the client. This may
not be the same as the ID of the current valid session
for this request.
If the client did not specify a session ID, this method returns
null.

 public String getServletPath()
Returns the part of this request's URL that calls
the servlet. This path starts with a "/" character
and includes either the servlet name or a path to
the servlet, but does not include any extra path
information or a query string. Same as the value of
the CGI variable SCRIPT_NAME.

This method will return an empty string ("") if the
servlet used to process this request was matched using
the "/*" pattern.

 public HttpSession getSession()
Returns the current session associated with this request,
or if the request does not have a session, creates one.

 public HttpSession getSession(boolean create)
Returns the current HttpSession
associated with this request or, if there is no
current session and create is true, returns 
a new session.

If create is false
and the request has no valid HttpSession,
this method returns null.

To make sure the session is properly maintained,
you must call this method before 
the response is committed. If the container is using cookies
to maintain session integrity and is asked to create a new session
when the response is committed, an IllegalStateException is thrown.

 public Principal getUserPrincipal()
Returns a java.security.Principal object containing
the name of the current authenticated user. If the user has not been
authenticated, the method returns null.

 public boolean isRequestedSessionIdFromCookie()
Checks whether the requested session ID came in as a cookie.

 public boolean isRequestedSessionIdFromURL()
Checks whether the requested session ID came in as part of the 
request URL.

 public boolean isRequestedSessionIdFromUrl()Deprecated! As -  of Version 2.1 of the Java Servlet
			API, use #isRequestedSessionIdFromURL 
			instead.

 public boolean isRequestedSessionIdValid()
Checks whether the requested session ID is still valid.

 public boolean isUserInRole(String role)
Returns a boolean indicating whether the authenticated user is included
in the specified logical "role".  Roles and role membership can be
defined using deployment descriptors.  If the user has not been
authenticated, the method returns false.