public class RequestFacade extends Object implements HttpServletRequest
| Modifier and Type | Field and Description |
|---|---|
protected Request |
request
The wrapped request.
|
protected static StringManager |
sm
The string manager for this package.
|
BASIC_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH, FORM_AUTH| Constructor and Description |
|---|
RequestFacade(Request request)
Construct a wrapper for the specified request.
|
| Modifier and Type | Method and Description |
|---|---|
boolean |
authenticate(HttpServletResponse response)
Triggers the same authentication process as would be triggered if the
request is for a resource that is protected by a security constraint.
|
void |
clear()
Clear facade.
|
protected Object |
clone()
Prevent cloning the facade.
|
void |
doUpgrade(UpgradeInbound inbound)
Sets the response status to
HttpServletResponse.SC_SWITCHING_PROTOCOLS and flushes the response. |
boolean |
getAllowTrace() |
AsyncContext |
getAsyncContext()
Get the current AsyncContext.
|
Object |
getAttribute(String name)
Returns the value of the named attribute as an
Object, or
null if no attribute of the given name exists. |
Enumeration<String> |
getAttributeNames()
Returns an
Enumeration containing the names of the
attributes available to this request. |
String |
getAuthType()
Returns the name of the authentication scheme used to protect the
servlet.
|
String |
getCharacterEncoding()
Returns the name of the character encoding used in the body of this
request.
|
int |
getContentLength()
Returns the length, in bytes, of the request body and made available by
the input stream, or -1 if the length is not known.
|
String |
getContentType()
Returns the MIME type of the body of the request, or
null if
the type is not known. |
String |
getContextPath()
Returns the portion of the request URI that indicates the context of the
request.
|
Cookie[] |
getCookies()
Returns an array containing all of the
Cookie objects the
client sent with this request. |
long |
getDateHeader(String name)
Returns the value of the specified request header as a
long
value that represents a Date object. |
DispatcherType |
getDispatcherType() |
String |
getHeader(String name)
Returns the value of the specified request header as a
String. |
Enumeration<String> |
getHeaderNames()
Returns an enumeration of all the header names this request contains.
|
Enumeration<String> |
getHeaders(String name)
Returns all the values of the specified request header as an
Enumeration of String objects. |
ServletInputStream |
getInputStream()
Retrieves the body of the request as binary data using a
ServletInputStream. |
int |
getIntHeader(String name)
Returns the value of the specified request header as an
int. |
String |
getLocalAddr()
Returns the Internet Protocol (IP) address of the interface on which the
request was received.
|
Locale |
getLocale()
Returns the preferred
Locale that the client will accept
content in, based on the Accept-Language header. |
Enumeration<Locale> |
getLocales()
Returns an
Enumeration of Locale objects
indicating, in decreasing order starting with the preferred locale, the
locales that are acceptable to the client based on the Accept-Language
header. |
String |
getLocalName()
Returns the host name of the Internet Protocol (IP) interface on which
the request was received.
|
int |
getLocalPort()
Returns the Internet Protocol (IP) port number of the interface on which
the request was received.
|
String |
getMethod()
Returns the name of the HTTP method with which this request was made, for
example, GET, POST, or PUT.
|
String |
getParameter(String name)
Returns the value of a request parameter as a
String, or
null if the parameter does not exist. |
Map<String,String[]> |
getParameterMap()
Returns a java.util.Map of the parameters of this request.
|
Enumeration<String> |
getParameterNames()
Returns an
Enumeration of String objects
containing the names of the parameters contained in this request. |
String[] |
getParameterValues(String name)
Returns an array of
String objects containing all of the
values the given request parameter has, or null if the
parameter does not exist. |
Part |
getPart(String name)
Gets the named Part or null if the Part does not exist.
|
Collection<Part> |
getParts()
Return a collection of all uploaded Parts.
|
String |
getPathInfo()
Returns any extra path information associated with the URL the client
sent when it made this request.
|
String |
getPathTranslated()
Returns any extra path information after the servlet name but before the
query string, and translates it to a real path.
|
String |
getProtocol()
Returns the name and version of the protocol the request uses in the form
protocol/majorVersion.minorVersion, for example, HTTP/1.1.
|
String |
getQueryString()
Returns the query string that is contained in the request URL after the
path.
|
BufferedReader |
getReader()
Retrieves the body of the request as character data using a
BufferedReader. |
String |
getRealPath(String path) |
String |
getRemoteAddr()
Returns the Internet Protocol (IP) address of the client or last proxy
that sent the request.
|
String |
getRemoteHost()
Returns the fully qualified name of the client or the last proxy that
sent the request.
|
int |
getRemotePort()
Returns the Internet Protocol (IP) source port of the client or last
proxy that sent the request.
|
String |
getRemoteUser()
Returns the login of the user making this request, if the user has been
authenticated, or
null if the user has not been
authenticated. |
RequestDispatcher |
getRequestDispatcher(String path)
Returns a
RequestDispatcher object that acts as a wrapper for the
resource located at the given path. |
String |
getRequestedSessionId()
Returns the session ID specified by the client.
|
String |
getRequestURI()
Returns the part of this request's URL from the protocol name up to the
query string in the first line of the HTTP request.
|
StringBuffer |
getRequestURL()
Reconstructs the URL the client used to make the request.
|
String |
getScheme()
Returns the name of the scheme used to make this request, for example,
http, https, or ftp. |
String |
getServerName()
Returns the host name of the server to which the request was sent.
|
int |
getServerPort()
Returns the port number to which the request was sent.
|
ServletContext |
getServletContext() |
String |
getServletPath()
Returns the part of this request's URL that calls the servlet.
|
HttpSession |
getSession()
Returns the current session associated with this request, or if the
request does not have a session, creates one.
|
HttpSession |
getSession(boolean create)
Returns the current
HttpSession associated with this request
or, if there is no current session and create is true,
returns a new session. |
Principal |
getUserPrincipal()
Returns a
java.security.Principal object containing the name
of the current authenticated user. |
boolean |
isAsyncStarted() |
boolean |
isAsyncSupported() |
boolean |
isRequestedSessionIdFromCookie()
Checks whether the requested session ID came in as a cookie.
|
boolean |
isRequestedSessionIdFromUrl() |
boolean |
isRequestedSessionIdFromURL()
Checks whether the requested session ID came in as part of the request
URL.
|
boolean |
isRequestedSessionIdValid()
Checks whether the requested session ID is still valid.
|
boolean |
isSecure()
Returns a boolean indicating whether this request was made using a secure
channel, such as HTTPS.
|
boolean |
isUserInRole(String role)
Returns a boolean indicating whether the authenticated user is included
in the specified logical "role".
|
void |
login(String username,
String password)
Authenticate the provided user name and password and then associated the
authenticated user with the request.
|
void |
logout()
Removes any authenticated user from the request.
|
void |
removeAttribute(String name)
Removes an attribute from this request.
|
void |
setAttribute(String name,
Object o)
Stores an attribute in this request.
|
void |
setCharacterEncoding(String env)
Overrides the name of the character encoding used in the body of this
request.
|
AsyncContext |
startAsync() |
AsyncContext |
startAsync(ServletRequest request,
ServletResponse response) |
<T extends HttpUpgradeHandler> |
upgrade(Class<T> httpUpgradeHandlerClass) |
protected Request request
protected static final StringManager sm
public RequestFacade(Request request)
request - The request to be wrappedpublic void clear()
protected Object clone() throws CloneNotSupportedException
clone in class ObjectCloneNotSupportedExceptionpublic Object getAttribute(String name)
ServletRequestObject, or
null if no attribute of the given name exists.
Attributes can be set two ways. The servlet container may set attributes
to make available custom information about a request. For example, for
requests made using HTTPS, the attribute
javax.servlet.request.X509Certificate can be used to
retrieve information on the certificate of the client. Attributes can
also be set programmatically using ServletRequest.setAttribute(java.lang.String, java.lang.Object).
This allows information to be embedded into a request before a
RequestDispatcher call.
Attribute names should follow the same conventions as package names. This
specification reserves names matching java.*,
javax.*, and sun.*.
getAttribute in interface ServletRequestname - a String specifying the name of the attributeObject containing the value of the attribute, or
null if the attribute does not existpublic Enumeration<String> getAttributeNames()
ServletRequestEnumeration containing the names of the
attributes available to this request. This method returns an empty
Enumeration if the request has no attributes available to
it.getAttributeNames in interface ServletRequestEnumeration of strings containing the names of the
request's attributespublic String getCharacterEncoding()
ServletRequestnull if the request does not
specify a character encodinggetCharacterEncoding in interface ServletRequestString containing the name of the character
encoding, or null if the request does not specify a
character encodingpublic void setCharacterEncoding(String env) throws UnsupportedEncodingException
ServletRequestsetCharacterEncoding in interface ServletRequestenv - a String containing the name of the character
encoding.UnsupportedEncodingException - if this is not a valid encodingpublic int getContentLength()
ServletRequestgetContentLength in interface ServletRequestpublic String getContentType()
ServletRequestnull if
the type is not known. For HTTP servlets, same as the value of the CGI
variable CONTENT_TYPE.getContentType in interface ServletRequestString containing the name of the MIME type of the
request, or null if the type is not knownpublic ServletInputStream getInputStream() throws IOException
ServletRequestServletInputStream. Either this method or ServletRequest.getReader() may
be called to read the body, not both.getInputStream in interface ServletRequestServletInputStream object containing the body of the
requestIOException - if an input or output exception occurredpublic String getParameter(String name)
ServletRequestString, or
null if the parameter does not exist. Request parameters are
extra information sent with the request. For HTTP servlets, parameters
are contained in the query string or posted form data.
You should only use this method when you are sure the parameter has only
one value. If the parameter might have more than one value, use
ServletRequest.getParameterValues(java.lang.String).
If you use this method with a multivalued parameter, the value returned
is equal to the first value in the array returned by
getParameterValues.
If the parameter data was sent in the request body, such as occurs with
an HTTP POST request, then reading the body directly via
ServletRequest.getInputStream() or ServletRequest.getReader() can interfere with the
execution of this method.
getParameter in interface ServletRequestname - a String specifying the name of the parameterString representing the single value of the
parameterServletRequest.getParameterValues(java.lang.String)public Enumeration<String> getParameterNames()
ServletRequestEnumeration of String objects
containing the names of the parameters contained in this request. If the
request has no parameters, the method returns an empty
Enumeration.getParameterNames in interface ServletRequestEnumeration of String objects, each
String containing the name of a request parameter;
or an empty Enumeration if the request has no
parameterspublic String[] getParameterValues(String name)
ServletRequestString objects containing all of the
values the given request parameter has, or null if the
parameter does not exist.
If the parameter has a single value, the array has a length of 1.
getParameterValues in interface ServletRequestname - a String containing the name of the parameter
whose value is requestedString objects containing the parameter's
valuesServletRequest.getParameter(java.lang.String)public Map<String,String[]> getParameterMap()
ServletRequestgetParameterMap in interface ServletRequestpublic String getProtocol()
ServletRequestSERVER_PROTOCOL.getProtocol in interface ServletRequestString containing the protocol name and version
numberpublic String getScheme()
ServletRequesthttp, https, or ftp. Different
schemes have different rules for constructing URLs, as noted in RFC 1738.getScheme in interface ServletRequestString containing the name of the scheme used to
make this requestpublic String getServerName()
ServletRequestHost header value,
if any, or the resolved server name, or the server IP address.getServerName in interface ServletRequestString containing the name of the serverpublic int getServerPort()
ServletRequestHost header value, if any, or the
server port where the client connection was accepted on.getServerPort in interface ServletRequestpublic BufferedReader getReader() throws IOException
ServletRequestBufferedReader. The reader translates the character data
according to the character encoding used on the body. Either this method
or ServletRequest.getInputStream() may be called to read the body, not both.getReader in interface ServletRequestBufferedReader containing the body of the requestUnsupportedEncodingException - if the character set encoding used is not supported and
the text cannot be decodedIOException - if an input or output exception occurredServletRequest.getInputStream()public String getRemoteAddr()
ServletRequestREMOTE_ADDR.getRemoteAddr in interface ServletRequestString containing the IP address of the client
that sent the requestpublic String getRemoteHost()
ServletRequestREMOTE_HOST.getRemoteHost in interface ServletRequestString containing the fully qualified name of the
clientpublic void setAttribute(String name, Object o)
ServletRequestRequestDispatcher.
Attribute names should follow the same conventions as package names.
Names beginning with java.*, javax.*, and
com.sun.*, are reserved for use by Sun Microsystems.
If the object passed in is null, the effect is the same as calling
ServletRequest.removeAttribute(java.lang.String).
It is warned that when the request is dispatched from the servlet resides
in a different web application by RequestDispatcher, the
object set by this method may not be correctly retrieved in the caller
servlet.
setAttribute in interface ServletRequestname - a String specifying the name of the attributeo - the Object to be storedpublic void removeAttribute(String name)
ServletRequest
Attribute names should follow the same conventions as package names.
Names beginning with java.*, javax.*, and
com.sun.*, are reserved for use by Sun Microsystems.
removeAttribute in interface ServletRequestname - a String specifying the name of the attribute to
removepublic Locale getLocale()
ServletRequestLocale that the client will accept
content in, based on the Accept-Language header. If the client request
doesn't provide an Accept-Language header, this method returns the
default locale for the server.getLocale in interface ServletRequestLocale for the clientpublic Enumeration<Locale> getLocales()
ServletRequestEnumeration of Locale objects
indicating, in decreasing order starting with the preferred locale, the
locales that are acceptable to the client based on the Accept-Language
header. If the client request doesn't provide an Accept-Language header,
this method returns an Enumeration containing one
Locale, the default locale for the server.getLocales in interface ServletRequestEnumeration of preferred Locale
objects for the clientpublic boolean isSecure()
ServletRequestisSecure in interface ServletRequestpublic RequestDispatcher getRequestDispatcher(String path)
ServletRequestRequestDispatcher object that acts as a wrapper for the
resource located at the given path. A RequestDispatcher
object can be used to forward a request to the resource or to include the
resource in a response. The resource can be dynamic or static.
The pathname specified may be relative, although it cannot extend outside
the current servlet context. If the path begins with a "/" it is
interpreted as relative to the current context root. This method returns
null if the servlet container cannot return a
RequestDispatcher.
The difference between this method and
ServletContext.getRequestDispatcher(java.lang.String) is that this method can take
a relative path.
getRequestDispatcher in interface ServletRequestpath - a String specifying the pathname to the resource.
If it is relative, it must be relative against the current
servlet.RequestDispatcher object that acts as a wrapper for
the resource at the specified path, or null if the
servlet container cannot return a RequestDispatcherRequestDispatcher,
ServletContext.getRequestDispatcher(java.lang.String)public String getRealPath(String path)
getRealPath in interface ServletRequestpath - The virtual path to be converted to a real pathServletContext.getRealPath(String)public String getAuthType()
HttpServletRequestnull is
returned.
Same as the value of the CGI variable AUTH_TYPE.
getAuthType in interface HttpServletRequestnull if the request was not authenticated.public Cookie[] getCookies()
HttpServletRequestCookie objects the
client sent with this request. This method returns null if
no cookies were sent.getCookies in interface HttpServletRequestCookies included with this
request, or null if the request has no cookiespublic long getDateHeader(String name)
HttpServletRequestlong
value that represents a Date object. Use this method with
headers that contain dates, such as If-Modified-Since.
The date is returned as the number of milliseconds since January 1, 1970 GMT. The header name is case insensitive.
If the request did not have a header of the specified name, this method
returns -1. If the header can't be converted to a date, the method throws
an IllegalArgumentException.
getDateHeader in interface HttpServletRequestname - a String specifying the name of the headerlong value representing the date specified in the
header expressed as the number of milliseconds since January 1,
1970 GMT, or -1 if the named header was not included with the
requestpublic String getHeader(String name)
HttpServletRequestString. If the request did not include a header of the
specified name, this method returns null. If there are
multiple headers with the same name, this method returns the first head
in the request. The header name is case insensitive. You can use this
method with any request header.getHeader in interface HttpServletRequestname - a String specifying the header nameString containing the value of the requested
header, or null if the request does not have a
header of that namepublic Enumeration<String> getHeaders(String name)
HttpServletRequestEnumeration of String objects.
Some headers, such as Accept-Language can be sent by clients
as several headers each with a different value rather than sending the
header as a comma separated list.
If the request did not include any headers of the specified name, this
method returns an empty Enumeration. The header name is case
insensitive. You can use this method with any request header.
getHeaders in interface HttpServletRequestname - a String specifying the header nameEnumeration containing the values of the requested
header. If the request does not have any headers of that name
return an empty enumeration. If the container does not allow
access to header information, return nullpublic Enumeration<String> getHeaderNames()
HttpServletRequest
Some servlet containers do not allow servlets to access headers using
this method, in which case this method returns null
getHeaderNames in interface HttpServletRequestnullpublic int getIntHeader(String name)
HttpServletRequestint.
If the request does not have a header of the specified name, this method
returns -1. If the header cannot be converted to an integer, this method
throws a NumberFormatException.
The header name is case insensitive.
getIntHeader in interface HttpServletRequestname - a String specifying the name of a request headerpublic String getMethod()
HttpServletRequestgetMethod in interface HttpServletRequestString specifying the name of the method with
which this request was madepublic String getPathInfo()
HttpServletRequest
This method returns null if there was no extra path
information.
Same as the value of the CGI variable PATH_INFO.
getPathInfo in interface HttpServletRequestString, decoded by the web container, specifying
extra path information that comes after the servlet path but
before the query string in the request URL; or null
if the URL does not have any extra path informationpublic String getPathTranslated()
HttpServletRequest
If the URL does not have any extra path information, this method returns
null or the servlet container cannot translate the virtual
path to a real path for any reason (such as when the web application is
executed from an archive). The web container does not decode this string.
getPathTranslated in interface HttpServletRequestString specifying the real path, or
null if the URL does not have any extra path
informationpublic String getContextPath()
HttpServletRequestgetContextPath in interface HttpServletRequestString specifying the portion of the request URI
that indicates the context of the requestpublic String getQueryString()
HttpServletRequestnull if the URL does not have a
query string. Same as the value of the CGI variable QUERY_STRING.getQueryString in interface HttpServletRequestString containing the query string or
null if the URL contains no query string. The value
is not decoded by the container.public String getRemoteUser()
HttpServletRequestnull if the user has not been
authenticated. Whether the user name is sent with each subsequent request
depends on the browser and type of authentication. Same as the value of
the CGI variable REMOTE_USER.getRemoteUser in interface HttpServletRequestString specifying the login of the user making
this request, or null if the user login is not knownpublic boolean isUserInRole(String role)
HttpServletRequestfalse.isUserInRole in interface HttpServletRequestrole - a String specifying the name of the roleboolean indicating whether the user making this
request belongs to a given role; false if the user
has not been authenticatedpublic Principal getUserPrincipal()
HttpServletRequestjava.security.Principal object containing the name
of the current authenticated user. If the user has not been
authenticated, the method returns null.getUserPrincipal in interface HttpServletRequestjava.security.Principal containing the name of the
user making this request; null if the user has not
been authenticatedpublic String getRequestedSessionId()
HttpServletRequestnull.getRequestedSessionId in interface HttpServletRequestString specifying the session ID, or
null if the request did not specify a session IDHttpServletRequest.isRequestedSessionIdValid()public String getRequestURI()
HttpServletRequest| First line of HTTP request | Returned Value | |
|---|---|---|
| POST /some/path.html HTTP/1.1 | /some/path.html | |
| GET http://foo.bar/a.html HTTP/1.0 | /a.html | |
| HEAD /xyz?a=b HTTP/1.1 | /xyz |
To reconstruct a URL with a scheme and host, use
HttpServletRequest.getRequestURL().
getRequestURI in interface HttpServletRequestString containing the part of the URL from the
protocol name up to the query stringHttpServletRequest.getRequestURL()public StringBuffer getRequestURL()
HttpServletRequest
Because this method returns a StringBuffer, not a string,
you can modify the URL easily, for example, to append query parameters.
This method is useful for creating redirect messages and for reporting errors.
getRequestURL in interface HttpServletRequestStringBuffer object containing the reconstructed
URLpublic String getServletPath()
HttpServletRequestThis method will return an empty string ("") if the servlet used to process this request was matched using the "/*" pattern.
getServletPath in interface HttpServletRequestString containing the name or path of the servlet
being called, as specified in the request URL, decoded, or an
empty string if the servlet used to process the request is
matched using the "/*" pattern.public HttpSession getSession(boolean create)
HttpServletRequestHttpSession associated with this request
or, if there is no current session and create is true,
returns a new session.
If create is false and the request has no valid
HttpSession, this method returns null.
To make sure the session is properly maintained, you must call this method before the response is committed. If the container is using cookies to maintain session integrity and is asked to create a new session when the response is committed, an IllegalStateException is thrown.
getSession in interface HttpServletRequestcreate - true to create a new session for this request if
necessary; false to return null if
there's no current sessionHttpSession associated with this request or
null if create is false
and the request has no valid sessionHttpServletRequest.getSession()public HttpSession getSession()
HttpServletRequestgetSession in interface HttpServletRequestHttpSession associated with this requestHttpServletRequest.getSession(boolean)public boolean isRequestedSessionIdValid()
HttpServletRequestisRequestedSessionIdValid in interface HttpServletRequesttrue if this request has an id for a valid session
in the current session context; false otherwiseHttpServletRequest.getRequestedSessionId(),
HttpServletRequest.getSession(boolean)public boolean isRequestedSessionIdFromCookie()
HttpServletRequestisRequestedSessionIdFromCookie in interface HttpServletRequesttrue if the session ID came in as a cookie;
otherwise, falseHttpServletRequest.getSession(boolean)public boolean isRequestedSessionIdFromURL()
HttpServletRequestisRequestedSessionIdFromURL in interface HttpServletRequesttrue if the session ID came in as part of a URL;
otherwise, falseHttpServletRequest.getSession(boolean)public boolean isRequestedSessionIdFromUrl()
isRequestedSessionIdFromUrl in interface HttpServletRequestHttpServletRequest.isRequestedSessionIdFromURL()public String getLocalAddr()
ServletRequestgetLocalAddr in interface ServletRequestString containing the IP address on which the
request was received.public String getLocalName()
ServletRequestgetLocalName in interface ServletRequestString containing the host name of the IP on which
the request was received.public int getLocalPort()
ServletRequestgetLocalPort in interface ServletRequestpublic int getRemotePort()
ServletRequestgetRemotePort in interface ServletRequestpublic ServletContext getServletContext()
getServletContext in interface ServletRequestpublic AsyncContext startAsync() throws IllegalStateException
startAsync in interface ServletRequestIllegalStateException - If async is not supported for this requestpublic AsyncContext startAsync(ServletRequest request, ServletResponse response) throws IllegalStateException
startAsync in interface ServletRequestrequest - The ServletRequest with which to initialise the
asynchronous contextresponse - The ServletResponse with which to initialise the
asynchronous contextIllegalStateException - If async is not supported for this requestpublic boolean isAsyncStarted()
isAsyncStarted in interface ServletRequestpublic boolean isAsyncSupported()
isAsyncSupported in interface ServletRequestpublic AsyncContext getAsyncContext()
ServletRequestgetAsyncContext in interface ServletRequestpublic DispatcherType getDispatcherType()
getDispatcherType in interface ServletRequestpublic boolean authenticate(HttpServletResponse response) throws IOException, ServletException
HttpServletRequestauthenticate in interface HttpServletRequestresponse - The response to use to return any authentication
challengetrue if the user is successfully authenticated and
false if notIOException - if the authentication process attempted to read from
the request or write to the response and an I/O error occurredServletException - if the authentication failed and the caller is
expected to handle the failurepublic void login(String username, String password) throws ServletException
HttpServletRequestlogin in interface HttpServletRequestusername - The user name to authenticatepassword - The password to use to authenticate the userServletException - If any of HttpServletRequest.getRemoteUser(),
HttpServletRequest.getUserPrincipal() or HttpServletRequest.getAuthType() are
non-null, if the configured authenticator does not support
user name and password authentication or if the
authentication failspublic void logout()
throws ServletException
HttpServletRequestlogout in interface HttpServletRequestServletException - If the logout failspublic Collection<Part> getParts() throws IllegalStateException, IOException, ServletException
HttpServletRequestgetParts in interface HttpServletRequestIllegalStateException - if size limits are exceeded or no multipart configuration is
providedIOException - if an I/O error occursServletException - if the request is not multipart/form-datapublic Part getPart(String name) throws IllegalStateException, IOException, ServletException
HttpServletRequestgetPart in interface HttpServletRequestname - The name of the Part to obtainIllegalStateException - if size limits are exceededIOException - if an I/O error occursServletException - if the request is not multipart/form-datapublic boolean getAllowTrace()
public void doUpgrade(UpgradeInbound inbound) throws IOException
HttpServletResponse.SC_SWITCHING_PROTOCOLS and flushes the response.
Protocol specific headers must have already been set before this method
is called.inbound - The handler for all further incoming data on the current
connection.IOException - If the upgrade fails (e.g. if the response has
already been committed.public <T extends HttpUpgradeHandler> T upgrade(Class<T> httpUpgradeHandlerClass) throws ServletException
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