HttpServletResponse (Servlet API Documentation)
Keywords: javax.servlet.http.HttpServletResponse interface

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## javax.servlet.http
Interface HttpServletResponse

All Superinterfaces:
  ServletResponse

All Known Implementing Classes:
  HttpServletResponseWrapper

public interface HttpServletResponse
extends 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).

Version:
  $Version$
Author:
  Various
See Also:
  `ServletResponse`

Field Summary
`static int` | `SC_ACCEPTED` Status code (202) indicating that a request was accepted for processing, but was not completed.
`static int` | `SC_BAD_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.
`static int` | `SC_BAD_REQUEST` Status code (400) indicating the request sent by the client was syntactically incorrect.
`static int` | `SC_CONFLICT` Status code (409) indicating that the request could not be completed due to a conflict with the current state of the resource.
`static int` | `SC_CONTINUE` Status code (100) indicating the client can continue.
`static int` | `SC_CREATED` Status code (201) indicating the request succeeded and created a new resource on the server.
`static int` | `SC_EXPECTATION_FAILED` Status code (417) indicating that the server could not meet the expectation given in the Expect request header.
`static int` | `SC_FORBIDDEN` Status code (403) indicating the server understood the request but refused to fulfill it.
`static int` | `SC_FOUND` Status code (302) indicating that the resource reside temporarily under a different URI.
`static int` | `SC_GATEWAY_TIMEOUT` Status code (504) indicating that the server did not receive a timely response from the upstream server while acting as a gateway or proxy.
`static int` | `SC_GONE` Status code (410) indicating that the resource is no longer available at the server and no forwarding address is known.
`static int` | `SC_HTTP_VERSION_NOT_SUPPORTED` 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.
`static int` | `SC_INTERNAL_SERVER_ERROR` Status code (500) indicating an error inside the HTTP server which prevented it from fulfilling the request.
`static int` | `SC_LENGTH_REQUIRED` Status code (411) indicating that the request cannot be handled without a defined `Content-Length`.
`static int` | `SC_METHOD_NOT_ALLOWED` Status code (405) indicating that the method specified in the `Request-Line` is not allowed for the resource identified by the `Request-URI`.
`static int` | `SC_MOVED_PERMANENTLY` 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.
`static int` | `SC_MOVED_TEMPORARILY` 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.
`static int` | `SC_MULTIPLE_CHOICES` Status code (300) indicating that the requested resource corresponds to any one of a set of representations, each with its own specific location.
`static int` | `SC_NO_CONTENT` Status code (204) indicating that the request succeeded but that there was no new information to return.
`static int` | `SC_NON_AUTHORITATIVE_INFORMATION` Status code (203) indicating that the meta information presented by the client did not originate from the server.
`static int` | `SC_NOT_ACCEPTABLE` 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.
`static int` | `SC_NOT_FOUND` Status code (404) indicating that the requested resource is not available.
`static int` | `SC_NOT_IMPLEMENTED` Status code (501) indicating the HTTP server does not support the functionality needed to fulfill the request.
`static int` | `SC_NOT_MODIFIED` Status code (304) indicating that a conditional GET operation found that the resource was available and not modified.
`static int` | `SC_OK` Status code (200) indicating the request succeeded normally.
`static int` | `SC_PARTIAL_CONTENT` Status code (206) indicating that the server has fulfilled the partial GET request for the resource.
`static int` | `SC_PAYMENT_REQUIRED` Status code (402) reserved for future use.
`static int` | `SC_PRECONDITION_FAILED` 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.
`static int` | `SC_PROXY_AUTHENTICATION_REQUIRED` Status code (407) indicating that the client MUST first authenticate itself with the proxy.
`static int` | `SC_REQUEST_ENTITY_TOO_LARGE` 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.
`static int` | `SC_REQUEST_TIMEOUT` Status code (408) indicating that the client did not produce a request within the time that the server was prepared to wait.
`static int` | `SC_REQUEST_URI_TOO_LONG` 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.
`static int` | `SC_REQUESTED_RANGE_NOT_SATISFIABLE` Status code (416) indicating that the server cannot serve the requested byte range.
`static int` | `SC_RESET_CONTENT` Status code (205) indicating that the agent SHOULD reset the document view which caused the request to be sent.
`static int` | `SC_SEE_OTHER` Status code (303) indicating that the response to the request can be found under a different URI.
`static int` | `SC_SERVICE_UNAVAILABLE` Status code (503) indicating that the HTTP server is temporarily overloaded, and unable to handle the request.
`static int` | `SC_SWITCHING_PROTOCOLS` Status code (101) indicating the server is switching protocols according to Upgrade header.
`static int` | `SC_TEMPORARY_REDIRECT` Status code (307) indicating that the requested resource resides temporarily under a different URI.
`static int` | `SC_UNAUTHORIZED` Status code (401) indicating that the request requires HTTP authentication.
`static int` | `SC_UNSUPPORTED_MEDIA_TYPE` 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.
`static int` | `SC_USE_PROXY` Status code (305) indicating that the requested resource MUST be accessed through the proxy given by the `Location` field.

Method Summary
`void` | `addCookie(Cookie cookie)` Adds the specified cookie to the response.
`void` | `addDateHeader(java.lang.String name, long date)` Adds a response header with the given name and date-value.
`void` | `addHeader(java.lang.String name, java.lang.String value)` Adds a response header with the given name and value.
`void` | `addIntHeader(java.lang.String name, int value)` Adds a response header with the given name and integer value.
`boolean` | `containsHeader(java.lang.String name)` Returns a boolean indicating whether the named response header has already been set.
`java.lang.String` | `encodeRedirectUrl(java.lang.String url)` Deprecated. As of version 2.1, use encodeRedirectURL(String url) instead
`java.lang.String` | `encodeRedirectURL(java.lang.String url)` Encodes the specified URL for use in the `sendRedirect` method or, if encoding is not needed, returns the URL unchanged.
`java.lang.String` | `encodeUrl(java.lang.String url)` Deprecated. As of version 2.1, use encodeURL(String url) instead
`java.lang.String` | `encodeURL(java.lang.String url)` Encodes the specified URL by including the session ID in it, or, if encoding is not needed, returns the URL unchanged.
`void` | `sendError(int sc)` Sends an error response to the client using the specified status code and clearing the buffer.
`void` | `sendError(int sc, java.lang.String msg)` Sends an error response to the client using the specified status.
`void` | `sendRedirect(java.lang.String location)` Sends a temporary redirect response to the client using the specified redirect location URL.
`void` | `setDateHeader(java.lang.String name, long date)` Sets a response header with the given name and date-value.
`void` | `setHeader(java.lang.String name, java.lang.String value)` Sets a response header with the given name and value.
`void` | `setIntHeader(java.lang.String name, int value)` Sets a response header with the given name and integer value.
`void` | `setStatus(int sc)` Sets the status code for this response.
`void` | `setStatus(int sc, java.lang.String sm)` Deprecated. As of version 2.1, due to ambiguous meaning of the message parameter. To set a status code use `setStatus(int)`, to send an error with a description use `sendError(int, String)`. Sets the status code and message for this response.

Methods inherited from interface javax.servlet.ServletResponse
`flushBuffer, getBufferSize, getCharacterEncoding, getContentType, getLocale, getOutputStream, getWriter, isCommitted, reset, resetBuffer, setBufferSize, setCharacterEncoding, setContentLength, setContentType, setLocale`

Field Detail

### SC_CONTINUE

    public static final int SC_CONTINUE

  Status code (100) indicating the client can continue.

  See Also:
    Constant Field Values

### SC_SWITCHING_PROTOCOLS

    public static final int SC_SWITCHING_PROTOCOLS

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

  See Also:
    Constant Field Values

### SC_OK

    public static final int SC_OK

  Status code (200) indicating the request succeeded normally.

  See Also:
    Constant Field Values

### SC_CREATED

    public static final int SC_CREATED

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

  See Also:
    Constant Field Values

### SC_ACCEPTED

    public static final int SC_ACCEPTED

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

  See Also:
    Constant Field Values

### SC_NON_AUTHORITATIVE_INFORMATION

    public static final int SC_NON_AUTHORITATIVE_INFORMATION

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

  See Also:
    Constant Field Values

### SC_NO_CONTENT

    public static final int SC_NO_CONTENT

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

  See Also:
    Constant Field Values

### SC_RESET_CONTENT

    public static final int SC_RESET_CONTENT

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

  See Also:
    Constant Field Values

### SC_PARTIAL_CONTENT

    public static final int SC_PARTIAL_CONTENT

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

  See Also:
    Constant Field Values

### SC_MULTIPLE_CHOICES

    public static final int SC_MULTIPLE_CHOICES

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

  See Also:
    Constant Field Values

### SC_MOVED_PERMANENTLY

    public static final int SC_MOVED_PERMANENTLY

  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.

  See Also:
    Constant Field Values

### SC_MOVED_TEMPORARILY

    public static final int SC_MOVED_TEMPORARILY

  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.

  See Also:
    Constant Field Values

### SC_FOUND

    public static final int SC_FOUND

  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.

  See Also:
    Constant Field Values

### SC_SEE_OTHER

    public static final int SC_SEE_OTHER

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

  See Also:
    Constant Field Values

### SC_NOT_MODIFIED

    public static final int SC_NOT_MODIFIED

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

  See Also:
    Constant Field Values

### SC_USE_PROXY

    public static final int SC_USE_PROXY

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

  See Also:
    Constant Field Values

### SC_TEMPORARY_REDIRECT

    public static final int SC_TEMPORARY_REDIRECT

  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.

  See Also:
    Constant Field Values

### SC_BAD_REQUEST

    public static final int SC_BAD_REQUEST

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

  See Also:
    Constant Field Values

### SC_UNAUTHORIZED

    public static final int SC_UNAUTHORIZED

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

  See Also:
    Constant Field Values

### SC_PAYMENT_REQUIRED

    public static final int SC_PAYMENT_REQUIRED

  Status code (402) reserved for future use.

  See Also:
    Constant Field Values

### SC_FORBIDDEN

    public static final int SC_FORBIDDEN

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

  See Also:
    Constant Field Values

### SC_NOT_FOUND

    public static final int SC_NOT_FOUND

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

  See Also:
    Constant Field Values

### SC_METHOD_NOT_ALLOWED

    public static final int SC_METHOD_NOT_ALLOWED

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

  See Also:
    Constant Field Values

### SC_NOT_ACCEPTABLE

    public static final int SC_NOT_ACCEPTABLE

  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.

  See Also:
    Constant Field Values

### SC_PROXY_AUTHENTICATION_REQUIRED

    public static final int SC_PROXY_AUTHENTICATION_REQUIRED

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

  See Also:
    Constant Field Values

### SC_REQUEST_TIMEOUT

    public static final int SC_REQUEST_TIMEOUT

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

  See Also:
    Constant Field Values

### SC_CONFLICT

    public static final int SC_CONFLICT

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

  See Also:
    Constant Field Values

### SC_GONE

    public static final int SC_GONE

  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.

  See Also:
    Constant Field Values

### SC_LENGTH_REQUIRED

    public static final int SC_LENGTH_REQUIRED

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

  See Also:
    Constant Field Values

### SC_PRECONDITION_FAILED

    public static final int SC_PRECONDITION_FAILED

  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.

  See Also:
    Constant Field Values

### SC_REQUEST_ENTITY_TOO_LARGE

    public static final int SC_REQUEST_ENTITY_TOO_LARGE

  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.

  See Also:
    Constant Field Values

### SC_REQUEST_URI_TOO_LONG

    public static final int SC_REQUEST_URI_TOO_LONG

  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.

  See Also:
    Constant Field Values

### SC_UNSUPPORTED_MEDIA_TYPE

    public static final int SC_UNSUPPORTED_MEDIA_TYPE

  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.

  See Also:
    Constant Field Values

### SC_REQUESTED_RANGE_NOT_SATISFIABLE

    public static final int SC_REQUESTED_RANGE_NOT_SATISFIABLE

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

  See Also:
    Constant Field Values

### SC_EXPECTATION_FAILED

    public static final int SC_EXPECTATION_FAILED

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

  See Also:
    Constant Field Values

### SC_INTERNAL_SERVER_ERROR

    public static final int SC_INTERNAL_SERVER_ERROR

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

  See Also:
    Constant Field Values

### SC_NOT_IMPLEMENTED

    public static final int SC_NOT_IMPLEMENTED

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

  See Also:
    Constant Field Values

### SC_BAD_GATEWAY

    public static final int SC_BAD_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.

  See Also:
    Constant Field Values

### SC_SERVICE_UNAVAILABLE

    public static final int SC_SERVICE_UNAVAILABLE

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

  See Also:
    Constant Field Values

### SC_GATEWAY_TIMEOUT

    public static final int SC_GATEWAY_TIMEOUT

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

  See Also:
    Constant Field Values

### SC_HTTP_VERSION_NOT_SUPPORTED

    public static final int SC_HTTP_VERSION_NOT_SUPPORTED

  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.

  See Also:
    Constant Field Values

Method Detail

### addCookie

    public void addCookie(Cookie cookie)

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

  Parameters:
    `cookie` - the Cookie to return to the client

### containsHeader

    public boolean containsHeader(java.lang.String name)

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

  Parameters:
    `name` - the header name
  Returns:
    `true` if the named response header has already been set; `false` otherwise

### encodeURL

    public java.lang.String encodeURL(java.lang.String url)

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

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

  Parameters:
    `url` - the url to be encoded.
  Returns:
    the encoded URL if encoding is needed; the unchanged URL otherwise.

### encodeRedirectURL

    public java.lang.String encodeRedirectURL(java.lang.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.

  Parameters:
    `url` - the url to be encoded.
  Returns:
    the encoded URL if encoding is needed; the unchanged URL otherwise.
  See Also:
    `sendRedirect(java.lang.String)`, `encodeUrl(java.lang.String)`

### encodeUrl

    public java.lang.String encodeUrl(java.lang.String url)

  Deprecated. As of version 2.1, use encodeURL(String url) instead

  Parameters:
    `url` - the url to be encoded.
  Returns:
    the encoded URL if encoding is needed; the unchanged URL otherwise.

### encodeRedirectUrl

    public java.lang.String encodeRedirectUrl(java.lang.String url)

  Deprecated. As of version 2.1, use encodeRedirectURL(String url) instead

  Parameters:
    `url` - the url to be encoded.
  Returns:
    the encoded URL if encoding is needed; the unchanged URL otherwise.

### sendError

    public void sendError(int sc,
                          java.lang.String msg)
                   throws java.io.IOException

  Sends an error response to the client using the specified status. The server defaults to creating the response to look like an HTML-formatted server error page containing the specified message, setting the content type to "text/html", leaving cookies and other headers unmodified. If an error-page declaration has been made for the web application corresponding to the status code passed in, it will be served back in preference to the suggested msg parameter.

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

  Parameters:
    `sc` - the error status code
    `msg` - the descriptive message
  Throws:
    `java.io.IOException` - If an input or output exception occurs
    `java.lang.IllegalStateException` - If the response was committed

### sendError

    public void sendError(int sc)
                   throws java.io.IOException

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

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

  Parameters:
    `sc` - the error status code
  Throws:
    `java.io.IOException` - If an input or output exception occurs
    `java.lang.IllegalStateException` - If the response was committed before this method call

### sendRedirect

    public void sendRedirect(java.lang.String location)
                      throws java.io.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.

  Parameters:
    `location` - the redirect location URL
  Throws:
    `java.io.IOException` - If an input or output exception occurs
    `java.lang.IllegalStateException` - If the response was committed or if a partial URL is given and cannot be converted into a valid URL

### setDateHeader

    public void setDateHeader(java.lang.String name,
                              long date)

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

  Parameters:
    `name` - the name of the header to set
    `date` - the assigned date value
  See Also:
    `containsHeader(java.lang.String)`, `addDateHeader(java.lang.String, long)`

### addDateHeader

    public void addDateHeader(java.lang.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.

  Parameters:
    `name` - the name of the header to set
    `date` - the additional date value
  See Also:
    `setDateHeader(java.lang.String, long)`

### setHeader

    public void setHeader(java.lang.String name,
                          java.lang.String value)

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

  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:
    `containsHeader(java.lang.String)`, `addHeader(java.lang.String, java.lang.String)`

### addHeader

    public void addHeader(java.lang.String name,
                          java.lang.String value)

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

  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:
    `setHeader(java.lang.String, java.lang.String)`

### setIntHeader

    public void setIntHeader(java.lang.String name,
                             int value)

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

  Parameters:
    `name` - the name of the header
    `value` - the assigned integer value
  See Also:
    `containsHeader(java.lang.String)`, `addIntHeader(java.lang.String, int)`

### addIntHeader

    public void addIntHeader(java.lang.String name,
                             int value)

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

  Parameters:
    `name` - the name of the header
    `value` - the assigned integer value
  See Also:
    `setIntHeader(java.lang.String, int)`

### setStatus

    public void setStatus(int sc)

  Sets the status code for this response. This method is used to set the return status code when there is no error (for example, for the status codes SC_OK or SC_MOVED_TEMPORARILY). If there is an error, and the caller wishes to invoke an error-page defined in the web application, the `sendError` method should be used instead.

  The container clears the buffer and sets the Location header, preserving cookies and other headers.

  Parameters:
    `sc` - the status code
  See Also:
    `sendError(int, java.lang.String)`

### setStatus

    public void setStatus(int sc,
                          java.lang.String sm)

  Deprecated. As of version 2.1, due to ambiguous meaning of the message parameter. To set a status code use `setStatus(int)`, to send an error with a description use `sendError(int, String)`. Sets the status code and message for this response.

  Parameters:
    `sc` - the status code
    `sm` - the status message

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