Class Response

java.lang.Object
org.apache.catalina.connector.Response
All Implemented Interfaces:
HttpServletResponse, ServletResponse
public class Response extends Object implements HttpServletResponse
Wrapper object for the Coyote response.
Author:
Remy Maucherat, Craig R. McClanahan

  • Field Details

    • sm

      protected static final StringManager sm

    • SC_EARLY_HINTS

      protected static final int SC_EARLY_HINTS
      See Also:

    • coyoteResponse

      protected final Response coyoteResponse
      Coyote response.

    • outputBuffer

      protected final OutputBuffer outputBuffer
      The associated output buffer.

    • outputStream

      protected CoyoteOutputStream outputStream
      The associated output stream.

    • writer

      protected CoyoteWriter writer
      The associated writer.

    • appCommitted

      protected boolean appCommitted
      The application commit flag.

    • included

      protected boolean included
      The included flag.

    • usingOutputStream

      protected boolean usingOutputStream
      Using output stream flag.

    • usingWriter

      protected boolean usingWriter
      Using writer flag.

    • urlEncoder

      protected final UEncoder urlEncoder
      URL encoder.

    • redirectURLCC

      protected final CharChunk redirectURLCC
      Recyclable buffer to hold the redirect URL.

    • request

      protected Request request
      The request with which this response is associated.

    • facade

      protected ResponseFacade facade
      The facade associated with this response.

  • Constructor Details

    • Response

      public Response(Response coyoteResponse)

    • Response

      public Response(Response coyoteResponse, int outputBufferSize)

  • Method Details

    • getCoyoteResponse

      public Response getCoyoteResponse()
      Returns:
      the Coyote response.

    • getContext

      public Context getContext()
      Returns:
      the Context within which this Request is being processed.

    • recycle

      public void recycle()
      Release all object references, and initialize instance variables, in preparation for reuse of this object.

    • getContentWritten

      public long getContentWritten()
      Returns:
      the number of bytes the application has actually written to the output stream. This excludes chunking, compression, etc. as well as headers.

    • getBytesWritten

      public long getBytesWritten(boolean flush)
      Parameters:
      flush - if true will perform a buffer flush first
      Returns:
      the number of bytes the actually written to the socket. This includes chunking, compression, etc. but excludes headers.

    • setAppCommitted

      public void setAppCommitted(boolean appCommitted)
      Set the application commit flag.
      Parameters:
      appCommitted - The new application committed flag value

    • isAppCommitted

      public boolean isAppCommitted()
      Application commit flag accessor.
      Returns:
      true if the application has committed the response

    • getRequest

      public Request getRequest()
      Returns:
      the Request with which this Response is associated.

    • setRequest

      public void setRequest(Request request)
      Set the Request with which this Response is associated.
      Parameters:
      request - The new associated request

    • getResponse

      public HttpServletResponse getResponse()
      Returns:
      the ServletResponse for which this object is the facade.

    • setResponse

      public void setResponse(HttpServletResponse applicationResponse)
      Set a wrapped HttpServletResponse to pass to the application. Components wishing to wrap the response should obtain the response via getResponse(), wrap it and then call this method with the wrapped response.
      Parameters:
      applicationResponse - The wrapped response to pass to the application

    • setSuspended

      public void setSuspended(boolean suspended)
      Set the suspended flag.
      Parameters:
      suspended - The new suspended flag value

    • isSuspended

      public boolean isSuspended()
      Suspended flag accessor.
      Returns:
      true if the response is suspended

    • isClosed

      public boolean isClosed()
      Closed flag accessor.
      Returns:
      true if the response has been closed

    • setError

      public void setError()
      Set the error flag if not already set.

    • isError

      public boolean isError()
      Error flag accessor.
      Returns:
      true if the response has encountered an error

    • isErrorReportRequired

      public boolean isErrorReportRequired()

    • setErrorReported

      public boolean setErrorReported()

    • resetError

      public void resetError()

    • finishResponse

      public void finishResponse() throws IOException
      Perform whatever actions are required to flush and close the output stream or writer, in a single operation.
      Throws:
      IOException - if an input/output error occurs

    • getContentLength

      public int getContentLength()
      Returns:
      the content length that was set or calculated for this Response.

    • getContentType

      public String getContentType()
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns the content type used for the MIME body sent in this response. The content type proper must have been specified using ServletResponse.setContentType(java.lang.String) before the response is committed. If no content type has been specified, this method returns null. If a content type has been specified and a character encoding has been explicitly or implicitly specified as described in ServletResponse.getCharacterEncoding(), the charset parameter is included in the string returned. If no character encoding has been specified, the charset parameter is omitted.
      Specified by:
      getContentType in interface ServletResponse
      Returns:
      a String specifying the content type, for example, text/html; charset=UTF-8, or null

    • getReporter

      public PrintWriter getReporter() throws IOException
      Return a PrintWriter that can be used to render error messages, regardless of whether a stream or writer has already been acquired.
      Returns:
      Writer which can be used for error reports. If the response is not an error report returned using sendError or triggered by an unexpected exception thrown during the servlet processing (and only in that case), null will be returned if the response stream has already been used.
      Throws:
      IOException - if an input/output error occurs

    • flushBuffer

      public void flushBuffer() throws IOException
      Description copied from interface: jakarta.servlet.ServletResponse
      Forces any content in the buffer to be written to the client. A call to this method automatically commits the response, meaning the status code and headers will be written.
      Specified by:
      flushBuffer in interface ServletResponse
      Throws:
      IOException - if an I/O occurs during the flushing of the response
      See Also:

    • getBufferSize

      public int getBufferSize()
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns the actual buffer size used for the response. If no buffering is used, this method returns 0.
      Specified by:
      getBufferSize in interface ServletResponse
      Returns:
      the actual buffer size used
      See Also:

    • getCharacterEncoding

      public String getCharacterEncoding()
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns the name of the character encoding (MIME charset) used for the body sent in this response. The charset for the MIME body response can be specified explicitly or implicitly. The priority order for specifying the response body is:
      1. explicitly per request using ServletResponse.setCharacterEncoding(java.lang.String) and ServletResponse.setContentType(java.lang.String)
      2. implicitly per request using ServletResponse.setLocale(java.util.Locale)
      3. per web application via the deployment descriptor or ServletContext.setRequestCharacterEncoding(String)
      4. container default via vendor specific configuration
      5. ISO-8859-1
      Calls made to ServletResponse.setCharacterEncoding(java.lang.String), ServletResponse.setContentType(java.lang.String) or ServletResponse.setLocale(java.util.Locale) after getWriter has been called or after the response has been committed have no effect on the character encoding. If no character encoding has been specified, ISO-8859-1 is returned.

      See RFC 2047 (http://www.ietf.org/rfc/rfc2047.txt) for more information about character encoding and MIME.

      Specified by:
      getCharacterEncoding in interface ServletResponse
      Returns:
      a String specifying the name of the character encoding, for example, UTF-8

    • getOutputStream

      public ServletOutputStream getOutputStream() throws IOException
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns a ServletOutputStream suitable for writing binary data in the response. The servlet container does not encode the binary data.

      Calling flush() on the ServletOutputStream commits the response. Either this method or ServletResponse.getWriter() may be called to write the body, not both.

      Specified by:
      getOutputStream in interface ServletResponse
      Returns:
      a ServletOutputStream for writing binary data
      Throws:
      IOException - if an input or output exception occurred
      See Also:

    • getLocale

      public Locale getLocale()
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns the locale specified for this response using the ServletResponse.setLocale(java.util.Locale) method. Calls made to setLocale after the response is committed have no effect.
      Specified by:
      getLocale in interface ServletResponse
      Returns:
      The locale specified for this response using the ServletResponse.setLocale(java.util.Locale) method. If no locale has been specified, the container's default locale is returned.
      See Also:

    • getWriter

      public PrintWriter getWriter() throws IOException
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns a PrintWriter object that can send character text to the client. The PrintWriter uses the character encoding returned by ServletResponse.getCharacterEncoding(). If the response's character encoding has not been specified as described in getCharacterEncoding (i.e., the method just returns the default value ISO-8859-1), getWriter updates it to ISO-8859-1.

      Calling flush() on the PrintWriter commits the response.

      Either this method or ServletResponse.getOutputStream() may be called to write the body, not both.

      Specified by:
      getWriter in interface ServletResponse
      Returns:
      a PrintWriter object that can return character data to the client
      Throws:
      IOException - if an input or output exception occurred
      See Also:

    • isCommitted

      public boolean isCommitted()
      Description copied from interface: jakarta.servlet.ServletResponse
      Returns a boolean indicating if the response has been committed. A committed response has already had its status code and headers written.
      Specified by:
      isCommitted in interface ServletResponse
      Returns:
      a boolean indicating if the response has been committed
      See Also:

    • reset

      public void reset()
      Description copied from interface: jakarta.servlet.ServletResponse
      Clears any data that exists in the buffer as well as the status code and headers. If the response has been committed, this method throws an IllegalStateException.
      Specified by:
      reset in interface ServletResponse
      See Also:

    • resetBuffer

      public void resetBuffer()
      Description copied from interface: jakarta.servlet.ServletResponse
      Clears the content of the underlying buffer in the response without clearing headers or status code. If the response has been committed, this method throws an IllegalStateException.
      Specified by:
      resetBuffer in interface ServletResponse
      See Also:

    • resetBuffer

      public void resetBuffer(boolean resetWriterStreamFlags)
      Reset the data buffer and the using Writer/Stream flags but not any status or header information.
      Parameters:
      resetWriterStreamFlags - true if the internal usingWriter, usingOutputStream, isCharacterEncodingSet flags should also be reset
      Throws:
      IllegalStateException - if the response has already been committed

    • setBufferSize

      public void setBufferSize(int size)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the preferred buffer size for the body of the response. The servlet container will use a buffer at least as large as the size requested. The actual buffer size used can be found using getBufferSize.

      A larger buffer allows more content to be written before anything is actually sent, thus providing the servlet with more time to set appropriate status codes and headers. A smaller buffer decreases server memory load and allows the client to start receiving data more quickly.

      This method must be called before any response body content is written; if content has been written or the response object has been committed, this method throws an IllegalStateException.

      Specified by:
      setBufferSize in interface ServletResponse
      Parameters:
      size - the preferred buffer size
      See Also:

    • setContentLength

      public void setContentLength(int length)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the length of the content body in the response In HTTP servlets, this method sets the HTTP Content-Length header.
      Specified by:
      setContentLength in interface ServletResponse
      Parameters:
      length - an integer specifying the length of the content being returned to the client; sets the Content-Length header

    • setContentLengthLong

      public void setContentLengthLong(long length)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the length of the content body in the response In HTTP servlets, this method sets the HTTP Content-Length header.
      Specified by:
      setContentLengthLong in interface ServletResponse
      Parameters:
      length - an integer specifying the length of the content being returned to the client; sets the Content-Length header

    • setContentType

      public void setContentType(String type)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the content type of the response being sent to the client, if the response has not been committed yet. The given content type may include a character encoding specification, for example, text/html;charset=UTF-8. The response's character encoding is only set from the given content type if this method is called before getWriter is called.

      This method may be called repeatedly to change content type and character encoding. This method has no effect if called after the response has been committed. It does not set the response's character encoding if it is called after getWriter has been called or after the response has been committed.

      Containers must communicate the content type and the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the Content-Type header is used.

      Specified by:
      setContentType in interface ServletResponse
      Parameters:
      type - a String specifying the MIME type of the content
      See Also:

    • setCharacterEncoding

      public void setCharacterEncoding(String encoding)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by container default, ServletContext default, ServletResponse.setCharacterEncoding(Charset), ServletResponse.setContentType(java.lang.String) or ServletResponse.setLocale(java.util.Locale), this method overrides it. Calling ServletResponse.setContentType(java.lang.String) with the String of text/html and calling this method with the String of UTF-8 is equivalent with calling setContentType with the String of text/html; charset=UTF-8.

      This method can be called repeatedly to change the character encoding. This method has no effect if it is called after getWriter has been called or after the response has been committed.

      Containers must communicate the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the character encoding is communicated as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response's writer.

      Specified by:
      setCharacterEncoding in interface ServletResponse
      Parameters:
      encoding - a String specifying only the character set defined by IANA Character Sets (http://www.iana.org/assignments/character-sets)
      See Also:

    • setCharacterEncoding

      public void setCharacterEncoding(Charset charset)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the character encoding (MIME charset) of the response being sent to the client, for example, to UTF-8. If the character encoding has already been set by container default, ServletContext default, ServletResponse.setCharacterEncoding(String), ServletResponse.setContentType(java.lang.String) or ServletResponse.setLocale(java.util.Locale), this method overrides it. Calling ServletResponse.setContentType(java.lang.String) with the String of text/html and calling this method with the StandardCharsets.UTF-8 is equivalent with calling setContentType with the String of text/html; charset=UTF-8.

      This method can be called repeatedly to change the character encoding. This method has no effect if it is called after getWriter has been called or after the response has been committed.

      Containers must communicate the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the character encoding is communicated as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response's writer.

      Specified by:
      setCharacterEncoding in interface ServletResponse
      Parameters:
      charset - The encoding to use or null
      See Also:

    • setLocale

      public void setLocale(Locale locale)
      Description copied from interface: jakarta.servlet.ServletResponse
      Sets the locale of the response, if the response has not been committed yet. It also sets the response's character encoding appropriately for the locale, if the character encoding has not been explicitly set using ServletResponse.setContentType(java.lang.String), ServletResponse.setCharacterEncoding(String) or ServletResponse.setCharacterEncoding(Charset), getWriter hasn't been called yet, and the response hasn't been committed yet. If the deployment descriptor contains a locale-encoding-mapping-list element, and that element provides a mapping for the given locale, that mapping is used. Otherwise, the mapping from locale to character encoding is container dependent.

      This method may be called repeatedly to change locale and character encoding. The method has no effect if called after the response has been committed. It does not set the response's character encoding if it is called after ServletResponse.setContentType(java.lang.String) has been called with a charset specification, after ServletResponse.setCharacterEncoding(java.lang.String) has been called, after getWriter has been called, or after the response has been committed.

      Containers must communicate the locale and the character encoding used for the servlet response's writer to the client if the protocol provides a way for doing so. In the case of HTTP, the locale is communicated via the Content-Language header, the character encoding as part of the Content-Type header for text media types. Note that the character encoding cannot be communicated via HTTP headers if the servlet does not specify a content type; however, it is still used to encode text written via the servlet response's writer.

      Specified by:
      setLocale in interface ServletResponse
      Parameters:
      locale - the locale of the response
      See Also:

    • getHeader

      public String getHeader(String name)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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 HttpServletResponse.getHeaders(String) to retrieve all of them.
      Specified by:
      getHeader in interface HttpServletResponse
      Parameters:
      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 .

    • getHeaderNames

      public Collection<String> getHeaderNames()
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Get the header names set for this HTTP response.
      Specified by:
      getHeaderNames in interface HttpServletResponse
      Returns:
      The header names set for this HTTP response.

    • getHeaders

      public Collection<String> getHeaders(String name)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Return a Collection of all the header values associated with the specified header name.
      Specified by:
      getHeaders in interface HttpServletResponse
      Parameters:
      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.

    • getMessage

      public String getMessage()
      Returns:
      the error message that was set with sendError() for this Response.

    • getStatus

      public int getStatus()
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Get the HTTP status code for this Response.
      Specified by:
      getStatus in interface HttpServletResponse
      Returns:
      The HTTP status code for this Response

    • addCookie

      public void addCookie(Cookie cookie)
      Add the specified Cookie to those that will be included with this Response.
      Specified by:
      addCookie in interface HttpServletResponse
      Parameters:
      cookie - Cookie to be added

    • addSessionCookieInternal

      public void addSessionCookieInternal(Cookie cookie)
      Special method for adding a session cookie as we should be overriding any previous.
      Parameters:
      cookie - The new session cookie to add the response

    • generateCookieString

      public String generateCookieString(Cookie cookie)

    • addDateHeader

      public void addDateHeader(String name, long value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.
      Specified by:
      addDateHeader in interface HttpServletResponse
      Parameters:
      name - the name of the header to set
      value - the additional date value
      See Also:

    • addHeader

      public void addHeader(String name, String value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Adds a response header with the given name and value. This method allows response headers to have multiple values.
      Specified by:
      addHeader in interface HttpServletResponse
      Parameters:
      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:

    • addIntHeader

      public void addIntHeader(String name, int value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Adds a response header with the given name and integer value. This method allows response headers to have multiple values.
      Specified by:
      addIntHeader in interface HttpServletResponse
      Parameters:
      name - the name of the header
      value - the assigned integer value
      See Also:

    • containsHeader

      public boolean containsHeader(String name)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Returns a boolean indicating whether the named response header has already been set.
      Specified by:
      containsHeader in interface HttpServletResponse
      Parameters:
      name - the header name
      Returns:
      true if the named response header has already been set; false otherwise

    • setTrailerFields

      public void setTrailerFields(Supplier<Map<String,String>> supplier)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.
      Specified by:
      setTrailerFields in interface HttpServletResponse
      Parameters:
      supplier - The supplier for the trailer headers

    • getTrailerFields

      public Supplier<Map<String,String>> getTrailerFields()
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Obtain the supplier of the trailer headers.
      The default implementation returns null.
      Specified by:
      getTrailerFields in interface HttpServletResponse
      Returns:
      The supplier for the trailer headers

    • encodeRedirectURL

      public String encodeRedirectURL(String url)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.

      Specified by:
      encodeRedirectURL in interface HttpServletResponse
      Parameters:
      url - the url to be encoded.
      Returns:
      the encoded URL if encoding is needed; the unchanged URL otherwise.
      See Also:

    • encodeURL

      public String encodeURL(String url)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.

      Specified by:
      encodeURL in interface HttpServletResponse
      Parameters:
      url - the url to be encoded.
      Returns:
      the encoded URL if encoding is needed; the unchanged URL otherwise.

    • sendAcknowledgement

      public void sendAcknowledgement(ContinueResponseTiming continueResponseTiming)
      Send an acknowledgement of a request.
      Parameters:
      continueResponseTiming - Indicates when the request for the ACK originated so it can be compared with the configured timing for ACK responses.

    • sendEarlyHints

      public void sendEarlyHints()

    • sendError

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

      Calling sendError with a status code of 103 differs from the usual behavior. Sending 103 will trigger the container to send a "103 Early Hints" informational response including all current headers. The application can continue to use the request and response after calling sendError with a 103 status code, including triggering a more typical response of any type.

      Starting with Tomcat 12, applications should use sendEarlyHints().

      Specified by:
      sendError in interface HttpServletResponse
      Parameters:
      status - the error status code
      Throws:
      IOException - If an input or output exception occurs

    • sendError

      public void sendError(int status, String message) throws IOException
      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.

      Calling sendError with a status code of 103 differs from the usual behavior. Sending 103 will trigger the container to send a "103 Early Hints" informational response including all current headers. The application can continue to use the request and response after calling sendError with a 103 status code, including triggering a more typical response of any type.

      Starting with Tomcat 12, applications should use sendEarlyHints().

      Specified by:
      sendError in interface HttpServletResponse
      Parameters:
      status - the error status code
      message - the descriptive message
      Throws:
      IOException - If an input or output exception occurs

    • sendRedirect

      public void sendRedirect(String location, int status, boolean clearBuffer) throws IOException
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      Sends a redirect response to the client using the specified redirect location URL and status code, optionally clears the response buffer and commits the response. If the response buffer is cleared, it will be replaced with a short hypertext note as per RFC 9110.

      This method has no effect if called from an include.

      This method accepts both relative and absolute URLs. Absolute URLs passed to this method are used as provided as the redirect location URL. Relative URLs are converted to absolute URLs unless a container specific feature/option is provided that controls whether relative URLs passed to this method are converted to absolute URLs or used as provided for the redirect location URL. If converting a relative URL to an absolute URL then:

      • 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.

      Specified by:
      sendRedirect in interface HttpServletResponse
      Parameters:
      location - the redirect location URL (may be absolute or relative)
      status - the status code to use for the redirect
      clearBuffer - if true, clear the buffer and replace it with the data set by this method otherwise retain the existing buffer
      Throws:
      IOException - If an input or output exception occurs

    • setDateHeader

      public void setDateHeader(String name, long value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.
      Specified by:
      setDateHeader in interface HttpServletResponse
      Parameters:
      name - the name of the header to set
      value - the assigned date value
      See Also:

    • setHeader

      public void setHeader(String name, String value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.
      Specified by:
      setHeader in interface HttpServletResponse
      Parameters:
      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:

    • setIntHeader

      public void setIntHeader(String name, int value)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.
      Specified by:
      setIntHeader in interface HttpServletResponse
      Parameters:
      name - the name of the header
      value - the assigned integer value
      See Also:

    • setStatus

      public void setStatus(int status)
      Description copied from interface: jakarta.servlet.http.HttpServletResponse
      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.

      Specified by:
      setStatus in interface HttpServletResponse
      Parameters:
      status - the status code
      See Also:

    • isEncodeable

      protected boolean isEncodeable(String location)
      Return true if the specified URL should be encoded with a session identifier. This will be true if all of the following conditions are met:
      • The request we are responding to asked for a valid session
      • The requested session ID was not received via a cookie
      • The specified URL points back to somewhere within the web application that is responding to this request
      Parameters:
      location - Absolute URL to be validated
      Returns:
      true if the URL should be encoded

    • toAbsolute

      protected String toAbsolute(String location)
      Convert (if necessary) and return the absolute URL that represents the resource referenced by this possibly relative URL. If this URL is already absolute, return it unchanged.
      Parameters:
      location - URL to be (possibly) converted and then returned
      Returns:
      the encoded URL
      Throws:
      IllegalArgumentException - if a MalformedURLException is thrown when converting the relative URL to an absolute one

    • toEncoded

      protected String toEncoded(String url, String sessionId)
      Return the specified URL with the specified session identifier suitably encoded.
      Parameters:
      url - URL to be encoded with the session id
      sessionId - Session id to be included in the encoded URL
      Returns:
      the encoded URL