https://tomcat.apache.org/: jakarta.servlet package 
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package jakarta.servlet.http;

import java.io.IOException;
import java.util.Collection;
import java.util.Map;
import java.util.function.Supplier;

import jakarta.servlet.ServletResponse;


Extends the ServletResponse interface to provide HTTP-specific functionality in sending a response. For example, it has methods to access HTTP headers and cookies. 

The servlet container creates an HttpServletResponse object and
passes it as an argument to the servlet's service methods (doGet, doPost, etc).

See Also:
/**
 * Extends the {@link ServletResponse} interface to provide HTTP-specific
 * functionality in sending a response. For example, it has methods to access
 * HTTP headers and cookies.
 * <p>
 * The servlet container creates an <code>HttpServletResponse</code> object and
 * passes it as an argument to the servlet's service methods (<code>doGet</code>, <code>doPost</code>, etc).
 *
 * @see jakarta.servlet.ServletResponse
 */
public interface HttpServletResponse extends ServletResponse {

    
Adds the specified cookie to the response. This method can be called
multiple times to set more than one cookie.

Params:
  • cookie – 
           the Cookie to return to the client
/**
     * Adds the specified cookie to the response. This method can be called
     * multiple times to set more than one cookie.
     *
     * @param cookie
     *            the Cookie to return to the client
     */
    public void addCookie(Cookie cookie);

    
Returns a boolean indicating whether the named response header has
already been set.

Params:
  • name – 
           the header name
Returns:true if the named response header has already been
        set; false otherwise
/**
     * Returns a boolean indicating whether the named response header has
     * already been set.
     *
     * @param name
     *            the header name
     * @return <code>true</code> if the named response header has already been
     *         set; <code>false</code> otherwise
     */
    public boolean containsHeader(String name);

    
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.

Params:
  • url – 
           the url to be encoded.
Returns:the encoded URL if encoding is needed; the unchanged URL
        otherwise.
/**
     * 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.
     * <p>
     * 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.
     *
     * @param url
     *            the url to be encoded.
     * @return the encoded URL if encoding is needed; the unchanged URL
     *         otherwise.
     */
    public String encodeURL(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.

Params:
  • url – 
           the url to be encoded.
See Also:
Returns:the encoded URL if encoding is needed; the unchanged URL
        otherwise.
/**
     * Encodes the specified URL for use in the <code>sendRedirect</code> 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 <code>encodeURL</code>
     * method.
     * <p>
     * All URLs sent to the <code>HttpServletResponse.sendRedirect</code> method
     * should be run through this method. Otherwise, URL rewriting cannot be
     * used with browsers which do not support cookies.
     *
     * @param url
     *            the url to be encoded.
     * @return the encoded URL if encoding is needed; the unchanged URL
     *         otherwise.
     * @see #sendRedirect
     * @see #encodeUrl
     */
    public String encodeRedirectURL(String url);

    
Params:
  • url – 
           the url to be encoded.
Returns:the encoded URL if encoding is needed; the unchanged URL
        otherwise.
Deprecated:As of version 2.1, use encodeURL(String url) instead
/**
     * @param url
     *            the url to be encoded.
     * @return the encoded URL if encoding is needed; the unchanged URL
     *         otherwise.
     * @deprecated As of version 2.1, use encodeURL(String url) instead
     */
    @Deprecated
    public String encodeUrl(String url);

    
Params:
  • url – 
           the url to be encoded.
Returns:the encoded URL if encoding is needed; the unchanged URL
        otherwise.
Deprecated:As of version 2.1, use encodeRedirectURL(String url) instead
/**
     * @param url
     *            the url to be encoded.
     * @return the encoded URL if encoding is needed; the unchanged URL
     *         otherwise.
     * @deprecated As of version 2.1, use encodeRedirectURL(String url) instead
     */
    @Deprecated
    public String encodeRedirectUrl(String url);

    
Sends an error response to the client using the specified status code and
clears the output buffer. 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.

Params:
  • sc – 
           the error status code
  • msg – 
           the descriptive message
Throws:
/**
     * Sends an error response to the client using the specified status code and
     * clears the output buffer. 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.
     * <p>
     * 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.
     *
     * @param sc
     *            the error status code
     * @param msg
     *            the descriptive message
     * @exception IOException
     *                If an input or output exception occurs
     * @exception IllegalStateException
     *                If the response was committed
     */
    public void sendError(int sc, String msg) throws IOException;

    
Sends an error response to the client using the specified status code and clears the buffer. This is equivalent to calling sendError(int, String) with the same status code and null for the message.

Params:
  • sc – 
           the error status code
Throws:
/**
     * Sends an error response to the client using the specified status code and
     * clears the buffer. This is equivalent to calling {@link #sendError(int,
     * String)} with the same status code and <code>null</code> for the message.
     *
     * @param sc
     *            the error status code
     * @exception IOException
     *                If an input or output exception occurs
     * @exception IllegalStateException
     *                If the response was committed before this method call
     */
    public void sendError(int sc) 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.

Params:
  • location – 
           the redirect location URL
Throws:
  • IOException – 
               If an input or output exception occurs
  • IllegalStateException – 
               If the response was committed or if a partial URL is given
               and cannot be converted into a valid URL
/**
     * 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.
     * <p>
     * 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.
     *
     * @param location
     *            the redirect location URL
     * @exception IOException
     *                If an input or output exception occurs
     * @exception IllegalStateException
     *                If the response was committed or if a partial URL is given
     *                and cannot be converted into a valid URL
     */
    public void sendRedirect(String location) throws IOException;

    
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.

Params:
  • name – 
           the name of the header to set
  • date – 
           the assigned date value
See Also:
/**
     * 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
     * <code>containsHeader</code> method can be used to test for the presence
     * of a header before setting its value.
     *
     * @param name
     *            the name of the header to set
     * @param date
     *            the assigned date value
     * @see #containsHeader
     * @see #addDateHeader
     */
    public void setDateHeader(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.

Params:
  • name – 
           the name of the header to set
  • date – 
           the additional date value
See Also:
/**
     * 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.
     *
     * @param name
     *            the name of the header to set
     * @param date
     *            the additional date value
     * @see #setDateHeader
     */
    public void addDateHeader(String name, long date);

    
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.

Params:
  • name – 
           the name of the header
  • value – 
           the header value If it contains octet string, it should be
           encoded according to RFC 2047
           (http://www.ietf.org/rfc/rfc2047.txt)
See Also:
/**
     * 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
     * <code>containsHeader</code> method can be used to test for the presence
     * of a header before setting its value.
     *
     * @param name
     *            the name of the header
     * @param value
     *            the header value If it contains octet string, it should be
     *            encoded according to RFC 2047
     *            (http://www.ietf.org/rfc/rfc2047.txt)
     * @see #containsHeader
     * @see #addHeader
     */
    public void setHeader(String name, String value);

    
Adds a response header with the given name and value. This method allows
response headers to have multiple values.

Params:
  • name – 
           the name of the header
  • value – 
           the additional header value If it contains octet string, it
           should be encoded according to RFC 2047
           (http://www.ietf.org/rfc/rfc2047.txt)
See Also:
/**
     * Adds a response header with the given name and value. This method allows
     * response headers to have multiple values.
     *
     * @param name
     *            the name of the header
     * @param value
     *            the additional header value If it contains octet string, it
     *            should be encoded according to RFC 2047
     *            (http://www.ietf.org/rfc/rfc2047.txt)
     * @see #setHeader
     */
    public void addHeader(String name, String 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.

Params:
  • name – 
           the name of the header
  • value – 
           the assigned integer value
See Also:
/**
     * 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 <code>containsHeader</code> method can be used to test for the
     * presence of a header before setting its value.
     *
     * @param name
     *            the name of the header
     * @param value
     *            the assigned integer value
     * @see #containsHeader
     * @see #addIntHeader
     */
    public void setIntHeader(String name, int value);

    
Adds a response header with the given name and integer value. This method
allows response headers to have multiple values.

Params:
  • name – 
           the name of the header
  • value – 
           the assigned integer value
See Also:
/**
     * Adds a response header with the given name and integer value. This method
     * allows response headers to have multiple values.
     *
     * @param name
     *            the name of the header
     * @param value
     *            the assigned integer value
     * @see #setIntHeader
     */
    public void addIntHeader(String name, int value);

    
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.

Params:
  • sc – 
           the status code
See Also:
/**
     * 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
     * <code>sendError</code> method should be used instead.
     * <p>
     * The container clears the buffer and sets the Location header, preserving
     * cookies and other headers.
     *
     * @param sc
     *            the status code
     * @see #sendError
     */
    public void setStatus(int sc);

    
Sets the status code and message for this response.

Params:
  • sc – 
           the status code
  • sm – 
           the status message
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.
     *
     * @param sc
     *            the status code
     * @param sm
     *            the status message
     * @deprecated As of version 2.1, due to ambiguous meaning of the message
     *             parameter. To set a status code use
     *             <code>setStatus(int)</code>, to send an error with a
     *             description use <code>sendError(int, String)</code>.
     */
    @Deprecated
    public void setStatus(int sc, String sm);

    
Get the HTTP status code for this Response.

Returns:The HTTP status code for this Response
Since:Servlet 3.0
/**
     * Get the HTTP status code for this Response.
     *
     * @return The HTTP status code for this Response
     *
     * @since Servlet 3.0
     */
    public int getStatus();

    
Return the value for the specified header, or null if this header has not been set. If more than one value was added for this name, only the first is returned; use getHeaders(String) to retrieve all of them. 
Params:
  • name – Header name to look up
Returns:The first value for the specified header. This is the raw value
        so if multiple values are specified in the first header then they
        will be returned as a single header value .
Since:Servlet 3.0
/**
     * Return the value for the specified header, or <code>null</code> if this
     * header has not been set.  If more than one value was added for this
     * name, only the first is returned; use {@link #getHeaders(String)} to
     * retrieve all of them.
     *
     * @param name Header name to look up
     *
     * @return The first value for the specified header. This is the raw value
     *         so if multiple values are specified in the first header then they
     *         will be returned as a single header value .
     *
     * @since Servlet 3.0
     */
    public String getHeader(String name);

    
Return a Collection of all the header values associated with the
specified header name.

Params:
  • name – Header name to look up
Returns:The values for the specified header. These are the raw values so
        if multiple values are specified in a single header that will be
        returned as a single header value.
Since:Servlet 3.0
/**
     * Return a Collection of all the header values associated with the
     * specified header name.
     *
     * @param name Header name to look up
     *
     * @return The values for the specified header. These are the raw values so
     *         if multiple values are specified in a single header that will be
     *         returned as a single header value.
     *
     * @since Servlet 3.0
     */
    public Collection<String> getHeaders(String name);

    
Get the header names set for this HTTP response.

Returns:The header names set for this HTTP response.
Since:Servlet 3.0
/**
     * Get the header names set for this HTTP response.
     *
     * @return The header names set for this HTTP response.
     *
     * @since Servlet 3.0
     */
    public Collection<String> getHeaderNames();

    
Configure the supplier of the trailer headers. The supplier will be
called in the scope of the thread that completes the response.


Trailers that don't meet the requirements of RFC 7230, section 4.1.2 will
be ignored.


The default implementation is a NO-OP.

Params:
  • supplier – The supplier for the trailer headers
Throws:
  • IllegalStateException – if this method is called when the
        underlying protocol does not support trailer headers or if using
        HTTP/1.1 and the response has already been committed
Since:Servlet 4.0
/**
     * Configure the supplier of the trailer headers. The supplier will be
     * called in the scope of the thread that completes the response.
     * <br>
     * Trailers that don't meet the requirements of RFC 7230, section 4.1.2 will
     * be ignored.
     * <br>
     * The default implementation is a NO-OP.
     *
     * @param supplier The supplier for the trailer headers
     *
     * @throws IllegalStateException if this method is called when the
     *         underlying protocol does not support trailer headers or if using
     *         HTTP/1.1 and the response has already been committed
     *
     * @since Servlet 4.0
     */
    public default void setTrailerFields(Supplier<Map<String, String>> supplier) {
        // NO-OP
    }

    
Obtain the supplier of the trailer headers.


The default implementation returns null.

Returns:The supplier for the trailer headers
Since:Servlet 4.0
/**
     * Obtain the supplier of the trailer headers.
     * <br>
     * The default implementation returns null.
     *
     * @return The supplier for the trailer headers
     *
     * @since Servlet 4.0
     */
    public default Supplier<Map<String, String>> getTrailerFields() {
        return null;
    }

    /*
     * Server status codes; see RFC 2068.
     */

    
Status code (100) indicating the client can continue.

/**
     * Status code (100) indicating the client can continue.
     */
    public static final int SC_CONTINUE = 100;

    
Status code (101) indicating the server is switching protocols according
to Upgrade header.

/**
     * Status code (101) indicating the server is switching protocols according
     * to Upgrade header.
     */
    public static final int SC_SWITCHING_PROTOCOLS = 101;

    
Status code (200) indicating the request succeeded normally.

/**
     * Status code (200) indicating the request succeeded normally.
     */
    public static final int SC_OK = 200;

    
Status code (201) indicating the request succeeded and created a new
resource on the server.

/**
     * Status code (201) indicating the request succeeded and created a new
     * resource on the server.
     */
    public static final int SC_CREATED = 201;

    
Status code (202) indicating that a request was accepted for processing,
but was not completed.

/**
     * Status code (202) indicating that a request was accepted for processing,
     * but was not completed.
     */
    public static final int SC_ACCEPTED = 202;

    
Status code (203) indicating that the meta information presented by the
client did not originate from the server.

/**
     * Status code (203) indicating that the meta information presented by the
     * client did not originate from the server.
     */
    public static final int SC_NON_AUTHORITATIVE_INFORMATION = 203;

    
Status code (204) indicating that the request succeeded but that there
was no new information to return.

/**
     * Status code (204) indicating that the request succeeded but that there
     * was no new information to return.
     */
    public static final int SC_NO_CONTENT = 204;

    
Status code (205) indicating that the agent SHOULD reset the
document view which caused the request to be sent.

/**
     * Status code (205) indicating that the agent <em>SHOULD</em> reset the
     * document view which caused the request to be sent.
     */
    public static final int SC_RESET_CONTENT = 205;

    
Status code (206) indicating that the server has fulfilled the partial
GET request for the resource.

/**
     * Status code (206) indicating that the server has fulfilled the partial
     * GET request for the resource.
     */
    public static final int SC_PARTIAL_CONTENT = 206;

    
Status code (300) indicating that the requested resource corresponds to
any one of a set of representations, each with its own specific location.

/**
     * Status code (300) indicating that the requested resource corresponds to
     * any one of a set of representations, each with its own specific location.
     */
    public static final int SC_MULTIPLE_CHOICES = 300;

    
Status code (301) indicating that the resource has permanently moved to a
new location, and that future references should use a new URI with their
requests.

/**
     * Status code (301) indicating that the resource has permanently moved to a
     * new location, and that future references should use a new URI with their
     * requests.
     */
    public static final int SC_MOVED_PERMANENTLY = 301;

    
Status code (302) indicating that the resource has temporarily moved to
another location, but that future references should still use the
original URI to access the resource. This definition is being retained
for backwards compatibility. SC_FOUND is now the preferred definition.

/**
     * Status code (302) indicating that the resource has temporarily moved to
     * another location, but that future references should still use the
     * original URI to access the resource. This definition is being retained
     * for backwards compatibility. SC_FOUND is now the preferred definition.
     */
    public static final int SC_MOVED_TEMPORARILY = 302;

    
Status code (302) indicating that the resource reside temporarily under a
different URI. Since the redirection might be altered on occasion, the
client should continue to use the Request-URI for future
requests.(HTTP/1.1) To represent the status code (302), it is recommended
to use this variable.

/**
     * Status code (302) indicating that the resource reside temporarily under a
     * different URI. Since the redirection might be altered on occasion, the
     * client should continue to use the Request-URI for future
     * requests.(HTTP/1.1) To represent the status code (302), it is recommended
     * to use this variable.
     */
    public static final int SC_FOUND = 302;

    
Status code (303) indicating that the response to the request can be
found under a different URI.

/**
     * Status code (303) indicating that the response to the request can be
     * found under a different URI.
     */
    public static final int SC_SEE_OTHER = 303;

    
Status code (304) indicating that a conditional GET operation found that
the resource was available and not modified.

/**
     * Status code (304) indicating that a conditional GET operation found that
     * the resource was available and not modified.
     */
    public static final int SC_NOT_MODIFIED = 304;

    
Status code (305) indicating that the requested resource MUST be
accessed through the proxy given by the Location
field.

/**
     * Status code (305) indicating that the requested resource <em>MUST</em> be
     * accessed through the proxy given by the <code><em>Location</em></code>
     * field.
     */
    public static final int SC_USE_PROXY = 305;

    
Status code (307) indicating that the requested resource resides
temporarily under a different URI. The temporary URI SHOULD be
given by the Location field in the response.

/**
     * Status code (307) indicating that the requested resource resides
     * temporarily under a different URI. The temporary URI <em>SHOULD</em> be
     * given by the <code><em>Location</em></code> field in the response.
     */
    public static final int SC_TEMPORARY_REDIRECT = 307;

    
Status code (400) indicating the request sent by the client was
syntactically incorrect.

/**
     * Status code (400) indicating the request sent by the client was
     * syntactically incorrect.
     */
    public static final int SC_BAD_REQUEST = 400;

    
Status code (401) indicating that the request requires HTTP
authentication.

/**
     * Status code (401) indicating that the request requires HTTP
     * authentication.
     */
    public static final int SC_UNAUTHORIZED = 401;

    
Status code (402) reserved for future use.

/**
     * Status code (402) reserved for future use.
     */
    public static final int SC_PAYMENT_REQUIRED = 402;

    
Status code (403) indicating the server understood the request but
refused to fulfill it.

/**
     * Status code (403) indicating the server understood the request but
     * refused to fulfill it.
     */
    public static final int SC_FORBIDDEN = 403;

    
Status code (404) indicating that the requested resource is not
available.

/**
     * Status code (404) indicating that the requested resource is not
     * available.
     */
    public static final int SC_NOT_FOUND = 404;

    
Status code (405) indicating that the method specified in the
Request-Line is not allowed for the resource
identified by the Request-URI.

/**
     * Status code (405) indicating that the method specified in the
     * <code><em>Request-Line</em></code> is not allowed for the resource
     * identified by the <code><em>Request-URI</em></code>.
     */
    public static final int SC_METHOD_NOT_ALLOWED = 405;

    
Status code (406) indicating that the resource identified by the request
is only capable of generating response entities which have content
characteristics not acceptable according to the accept headers sent in
the request.

/**
     * Status code (406) indicating that the resource identified by the request
     * is only capable of generating response entities which have content
     * characteristics not acceptable according to the accept headers sent in
     * the request.
     */
    public static final int SC_NOT_ACCEPTABLE = 406;

    
Status code (407) indicating that the client MUST first
authenticate itself with the proxy.

/**
     * Status code (407) indicating that the client <em>MUST</em> first
     * authenticate itself with the proxy.
     */
    public static final int SC_PROXY_AUTHENTICATION_REQUIRED = 407;

    
Status code (408) indicating that the client did not produce a request
within the time that the server was prepared to wait.

/**
     * Status code (408) indicating that the client did not produce a request
     * within the time that the server was prepared to wait.
     */
    public static final int SC_REQUEST_TIMEOUT = 408;

    
Status code (409) indicating that the request could not be completed due
to a conflict with the current state of the resource.

/**
     * Status code (409) indicating that the request could not be completed due
     * to a conflict with the current state of the resource.
     */
    public static final int SC_CONFLICT = 409;

    
Status code (410) indicating that the resource is no longer available at
the server and no forwarding address is known. This condition
SHOULD be considered permanent.

/**
     * Status code (410) indicating that the resource is no longer available at
     * the server and no forwarding address is known. This condition
     * <em>SHOULD</em> be considered permanent.
     */
    public static final int SC_GONE = 410;

    
Status code (411) indicating that the request cannot be handled without a
defined Content-Length.

/**
     * Status code (411) indicating that the request cannot be handled without a
     * defined <code><em>Content-Length</em></code>.
     */
    public static final int SC_LENGTH_REQUIRED = 411;

    
Status code (412) indicating that the precondition given in one or more
of the request-header fields evaluated to false when it was tested on the
server.

/**
     * Status code (412) indicating that the precondition given in one or more
     * of the request-header fields evaluated to false when it was tested on the
     * server.
     */
    public static final int SC_PRECONDITION_FAILED = 412;

    
Status code (413) indicating that the server is refusing to process the
request because the request entity is larger than the server is willing
or able to process.

/**
     * Status code (413) indicating that the server is refusing to process the
     * request because the request entity is larger than the server is willing
     * or able to process.
     */
    public static final int SC_REQUEST_ENTITY_TOO_LARGE = 413;

    
Status code (414) indicating that the server is refusing to service the
request because the Request-URI is longer than the
server is willing to interpret.

/**
     * Status code (414) indicating that the server is refusing to service the
     * request because the <code><em>Request-URI</em></code> is longer than the
     * server is willing to interpret.
     */
    public static final int SC_REQUEST_URI_TOO_LONG = 414;

    
Status code (415) indicating that the server is refusing to service the
request because the entity of the request is in a format not supported by
the requested resource for the requested method.

/**
     * Status code (415) indicating that the server is refusing to service the
     * request because the entity of the request is in a format not supported by
     * the requested resource for the requested method.
     */
    public static final int SC_UNSUPPORTED_MEDIA_TYPE = 415;

    
Status code (416) indicating that the server cannot serve the requested
byte range.

/**
     * Status code (416) indicating that the server cannot serve the requested
     * byte range.
     */
    public static final int SC_REQUESTED_RANGE_NOT_SATISFIABLE = 416;

    
Status code (417) indicating that the server could not meet the
expectation given in the Expect request header.

/**
     * Status code (417) indicating that the server could not meet the
     * expectation given in the Expect request header.
     */
    public static final int SC_EXPECTATION_FAILED = 417;

    
Status code (500) indicating an error inside the HTTP server which
prevented it from fulfilling the request.

/**
     * Status code (500) indicating an error inside the HTTP server which
     * prevented it from fulfilling the request.
     */
    public static final int SC_INTERNAL_SERVER_ERROR = 500;

    
Status code (501) indicating the HTTP server does not support the
functionality needed to fulfill the request.

/**
     * Status code (501) indicating the HTTP server does not support the
     * functionality needed to fulfill the request.
     */
    public static final int SC_NOT_IMPLEMENTED = 501;

    
Status code (502) indicating that the HTTP server received an invalid
response from a server it consulted when acting as a proxy or gateway.

/**
     * Status code (502) indicating that the HTTP server received an invalid
     * response from a server it consulted when acting as a proxy or gateway.
     */
    public static final int SC_BAD_GATEWAY = 502;

    
Status code (503) indicating that the HTTP server is temporarily
overloaded, and unable to handle the request.

/**
     * Status code (503) indicating that the HTTP server is temporarily
     * overloaded, and unable to handle the request.
     */
    public static final int SC_SERVICE_UNAVAILABLE = 503;

    
Status code (504) indicating that the server did not receive a timely
response from the upstream server while acting as a gateway or proxy.

/**
     * Status code (504) indicating that the server did not receive a timely
     * response from the upstream server while acting as a gateway or proxy.
     */
    public static final int SC_GATEWAY_TIMEOUT = 504;

    
Status code (505) indicating that the server does not support or refuses
to support the HTTP protocol version that was used in the request
message.

/**
     * Status code (505) indicating that the server does not support or refuses
     * to support the HTTP protocol version that was used in the request
     * message.
     */
    public static final int SC_HTTP_VERSION_NOT_SUPPORTED = 505;
}