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package javax.servlet.http;
import java.io.IOException;
import java.util.Collection;
import javax.servlet.ServletResponse;
/**
*
* 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.
*
* The servlet container creates an HttpServletResponse object
* and passes it as an argument to the servlet's service methods
* (doGet, doPost, etc).
*
*
* @author Various
*
* @see javax.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.
*
* @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.
*
* @param name the header name
* @return true if the named response header
* has already been set;
* false otherwise
*/
public boolean containsHeader(String name);
/**
* Encodes the specified URL by including the session ID,
* 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.
*
*
If the URL is relative, it is always relative to the current
* HttpServletRequest.
*
* @param url the url to be encoded.
* @return the encoded URL if encoding is needed;
* the unchanged URL otherwise.
* @exception IllegalArgumentException if the url is not valid
*/
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. For example, if the browser supports
* cookies, or session tracking is turned off, URL encoding is
* unnecessary. 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.
*
*
If the URL is relative, it is always relative to the current
* HttpServletRequest.
*
* @param url the url to be encoded.
* @return the encoded URL if encoding is needed;
* the unchanged URL otherwise.
* @exception IllegalArgumentException if the url is not valid
*
* @see #sendRedirect
* @see #encodeUrl
*/
public String encodeRedirectURL(String url);
/**
* @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.
* @exception IllegalArgumentException if the url is not valid
*/
public String encodeUrl(String url);
/**
* @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.
* @exception IllegalArgumentException if the url is not valid
*/
public String encodeRedirectUrl(String url);
/**
* Sends an error response to the client using the specified
* status and clears the 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". The server will preserve cookies and may clear or
* update any headers needed to serve the error page as a valid response.
*
* 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 and the msg parameter will
* be ignored.
*
*
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.
*
* The server will preserve cookies and may clear or
* update any headers needed to serve the error page as a valid response.
*
* If an error-page declaration has been made for the web application
* corresponding to the status code passed in, it will be served back
* the error page
*
*
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
* @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 and clears the buffer. The buffer will
* be replaced with the data set by this method. Calling this method sets the
* status code to {@link #SC_FOUND} 302 (Found).
* 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 location is relative with two leading '/' the container interprets
* it as a network-path reference (see
*
* RFC 3986: Uniform Resource Identifier (URI): Generic Syntax, section 4.2
* "Relative Reference").
*
*
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.
*
* @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.
*
* @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.
*
* @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.
*
* @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.
*
* @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.
*
* @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 SC_OK or SC_MOVED_TEMPORARILY status
* codes).
*
*
If this method is used to set an error code, then the container's
* error page mechanism will not be triggered. If there is an error and
* the caller wishes to invoke an error page defined in the web
* application, then {@link #sendError} must be used instead.
*
*
This method preserves any cookies and other response headers.
*
*
Valid status codes are those in the 2XX, 3XX, 4XX, and 5XX ranges.
* Other status codes are treated as container specific.
*
* @param sc the status code
*
* @see #sendError
*/
public void setStatus(int sc);
/**
* @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
*/
public void setStatus(int sc, String sm);
/**
* Gets the current status code of this response.
*
* @return the current status code of this response
*
* @since Servlet 3.0
*/
public int getStatus();
/**
* Gets the value of the response header with the given name.
*
*
If a response header with the given name exists and contains
* multiple values, the value that was added first will be returned.
*
*
This method considers only response headers set or added via
* {@link #setHeader}, {@link #addHeader}, {@link #setDateHeader},
* {@link #addDateHeader}, {@link #setIntHeader}, or
* {@link #addIntHeader}, respectively.
*
* @param name the name of the response header whose value to return
*
* @return the value of the response header with the given name,
* or null if no header with the given name has been set
* on this response
*
* @since Servlet 3.0
*/
public String getHeader(String name);
/**
* Gets the values of the response header with the given name.
*
*
This method considers only response headers set or added via
* {@link #setHeader}, {@link #addHeader}, {@link #setDateHeader},
* {@link #addDateHeader}, {@link #setIntHeader}, or
* {@link #addIntHeader}, respectively.
*
*
Any changes to the returned Collection must not
* affect this HttpServletResponse.
*
* @param name the name of the response header whose values to return
*
* @return a (possibly empty) Collection of the values
* of the response header with the given name
*
* @since Servlet 3.0
*/
public Collection getHeaders(String name);
/**
* Gets the names of the headers of this response.
*
* This method considers only response headers set or added via
* {@link #setHeader}, {@link #addHeader}, {@link #setDateHeader},
* {@link #addDateHeader}, {@link #setIntHeader}, or
* {@link #addIntHeader}, respectively.
*
*
Any changes to the returned Collection must not
* affect this HttpServletResponse.
*
* @return a (possibly empty) Collection of the names
* of the headers of this response
*
* @since Servlet 3.0
*/
public Collection getHeaderNames();
/*
* Server status codes; see RFC 2068.
*/
/**
* 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.
*/
public static final int SC_SWITCHING_PROTOCOLS = 101;
/**
* 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.
*/
public static final int SC_CREATED = 201;
/**
* 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.
*/
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.
*/
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.
*/
public static final int SC_RESET_CONTENT = 205;
/**
* 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.
*/
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.
*/
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.
*/
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.
*/
public static final int SC_FOUND = 302;
/**
* 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.
*/
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.
*/
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.
*/
public static final int SC_TEMPORARY_REDIRECT = 307;
/**
* 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.
*/
public static final int SC_UNAUTHORIZED = 401;
/**
* 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.
*/
public static final int SC_FORBIDDEN = 403;
/**
* 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.
*/
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.
*/
public static final int SC_NOT_ACCEPTABLE = 406;
/**
* Status code (407) indicating that the client MUST 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.
*/
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.
*/
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.
*/
public static final int SC_GONE = 410;
/**
* Status code (411) indicating that the request cannot be handled
* without a defined Content-Length.
*/
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.
*/
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.
*/
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.
*/
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.
*/
public static final int SC_UNSUPPORTED_MEDIA_TYPE = 415;
/**
* 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.
*/
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.
*/
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.
*/
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.
*/
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.
*/
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.
*/
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.
*/
public static final int SC_HTTP_VERSION_NOT_SUPPORTED = 505;
}