public  void addCookie(Cookie cookie)
Adds the specified cookie to the response.  This method can be called
multiple times to set more than one cookie.

 public  void addDateHeader(String name,
    long date)
Adds a response header with the given name and
date-value.  The date is specified in terms of
milliseconds since the epoch.  This method allows response headers 
to have multiple values.

 public  void addHeader(String name,
    String value)
Adds a response header with the given name and value.
This method allows response headers to have multiple values.

 public  void addIntHeader(String name,
    int value)
Adds a response header with the given name and
integer value.  This method allows response headers to have multiple
values.

 public boolean containsHeader(String name)
Returns a boolean indicating whether the named response header 
has already been set.

 public String encodeRedirectURL(String url)
Encodes the specified URL for use in the
sendRedirect method or, if encoding is not needed,
returns the URL unchanged.  The implementation of this method
includes the logic to determine whether the session ID
needs to be encoded in the URL.  Because the rules for making
this determination can differ from those used to decide whether to
encode a normal link, this method is separated from the
encodeURL method.

All URLs sent to the HttpServletResponse.sendRedirect
method should be run through this method.  Otherwise, URL
rewriting cannot be used with browsers which do not support
cookies.

 public String encodeRedirectUrl(String url)Deprecated! As -  of version 2.1, use 
		encodeRedirectURL(String url) instead

 public String encodeURL(String url)
Encodes the specified URL by including the session ID in it,
or, if encoding is not needed, returns the URL unchanged.
The implementation of this method includes the logic to
determine whether the session ID needs to be encoded in the URL.
For example, if the browser supports cookies, or session
tracking is turned off, URL encoding is unnecessary.

For robust session tracking, all URLs emitted by a servlet 
should be run through this
method.  Otherwise, URL rewriting cannot be used with browsers
which do not support cookies.

 public String encodeUrl(String url)Deprecated! As -  of version 2.1, use encodeURL(String url) instead

 public  void sendError(int sc) throws IOException
Sends an error response to the client using the specified status
code and clearing the buffer. 
If the response has already been committed, this method throws 
an IllegalStateException.
After using this method, the response should be considered
to be committed and should not be written to.

 public  void sendError(int sc,
    String msg) throws IOException
Sends an error response to the client using the specified
status.  The server defaults to creating the
response to look like an HTML-formatted server error page
containing the specified message, setting the content type
to "text/html", leaving cookies and other headers unmodified.

If an error-page declaration has been made for the web application
corresponding to the status code passed in, it will be served back in 
preference to the suggested msg parameter. 

If the response has already been committed, this method throws 
an IllegalStateException.
After using this method, the response should be considered
to be committed and should not be written to.

 public  void sendRedirect(String location) throws IOException
Sends a temporary redirect response to the client using the
specified redirect location URL.  This method can accept relative URLs;
the servlet container must convert the relative URL to an absolute URL
before sending the response to the client. If the location is relative 
without a leading '/' the container interprets it as relative to
the current request URI. If the location is relative with a leading
'/' the container interprets it as relative to the servlet container root.

If the response has already been committed, this method throws 
an IllegalStateException.
After using this method, the response should be considered
to be committed and should not be written to.

 public  void setDateHeader(String name,
    long date)
Sets a response header with the given name and
date-value.  The date is specified in terms of
milliseconds since the epoch.  If the header had already
been set, the new value overwrites the previous one.  The
containsHeader method can be used to test for the
presence of a header before setting its value.

 public  void setHeader(String name,
    String value)
Sets a response header with the given name and value.
If the header had already been set, the new value overwrites the
previous one.  The containsHeader method can be
used to test for the presence of a header before setting its
value.

 public  void setIntHeader(String name,
    int value)
Sets a response header with the given name and
integer value.  If the header had already been set, the new value
overwrites the previous one.  The containsHeader
method can be used to test for the presence of a header before
setting its value.

 public  void setStatus(int sc)
Sets the status code for this response.  This method is used to
set the return status code when there is no error (for example,
for the status codes SC_OK or SC_MOVED_TEMPORARILY).  If there
is an error, and the caller wishes to invoke an error-page defined
in the web application, the sendError method should be used
instead.
 The container clears the buffer and sets the Location header, preserving
cookies and other headers.

 public  void setStatus(int sc,
    String sm)Deprecated! As -  of version 2.1, due to ambiguous meaning of the 
message parameter. To set a status code 
use setStatus(int), to send an error with a description
use sendError(int, String).

Sets the status code and message for this response.