# Class HttpServletRequestWrapper

java.lang.Object
javax.servlet.ServletRequestWrapper
javax.servlet.http.HttpServletRequestWrapper

All Implemented Interfaces:
  `HttpServletRequest`, `ServletRequest`

public class HttpServletRequestWrapper extends ServletRequestWrapper implements HttpServletRequest
Provides a convenient implementation of the HttpServletRequest interface that can be subclassed by developers wishing to adapt the request to a Servlet. This class implements the Wrapper or Decorator pattern. Methods default to calling through to the wrapped request object.

Since:
  Servlet 2.3
See Also:
  - `HttpServletRequest`

- ## Field Summary

  ### Fields inherited from interface javax.servlet.http.HttpServletRequest

  `BASIC_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH, FORM_AUTH`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `HttpServletRequestWrapper(HttpServletRequest request)`
  Constructs a request object wrapping the given request.

- ## Method Summary

  Modifier and Type
  Method
  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.
  `String`
  `changeSessionId()`
  The default behavior of this method is to call changeSessionId() on the wrapped request object.
  `String`
  `getAuthType()`
  The default behavior of this method is to return getAuthType() on the wrapped request object.
  `String`
  `getContextPath()`
  The default behavior of this method is to return getContextPath() on the wrapped request object.
  `Cookie[]`
  `getCookies()`
  The default behavior of this method is to return getCookies() on the wrapped request object.
  `long`
  `getDateHeader(String name)`
  The default behavior of this method is to return getDateHeader(String name) on the wrapped request object.
  `String`
  `getHeader(String name)`
  The default behavior of this method is to return getHeader(String name) on the wrapped request object.
  `Enumeration<String>`
  `getHeaderNames()`
  The default behavior of this method is to return getHeaderNames() on the wrapped request object.
  `Enumeration<String>`
  `getHeaders(String name)`
  The default behavior of this method is to return getHeaders(String name) on the wrapped request object.
  `HttpServletMapping`
  `getHttpServletMapping()`
  The default behavior of this method is to return `HttpServletRequest.getHttpServletMapping()` on the wrapped request object.
  `int`
  `getIntHeader(String name)`
  The default behavior of this method is to return getIntHeader(String name) on the wrapped request object.
  `String`
  `getMethod()`
  The default behavior of this method is to return getMethod() on the wrapped request object.
  `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()`
  The default behavior of this method is to return getPathInfo() on the wrapped request object.
  `String`
  `getPathTranslated()`
  The default behavior of this method is to return getPathTranslated() on the wrapped request object.
  `String`
  `getQueryString()`
  The default behavior of this method is to return getQueryString() on the wrapped request object.
  `String`
  `getRemoteUser()`
  The default behavior of this method is to return getRemoteUser() on the wrapped request object.
  `String`
  `getRequestedSessionId()`
  The default behavior of this method is to return getRequestedSessionId() on the wrapped request object.
  `String`
  `getRequestURI()`
  The default behavior of this method is to return getRequestURI() on the wrapped request object.
  `StringBuffer`
  `getRequestURL()`
  The default behavior of this method is to return getRequestURL() on the wrapped request object.
  `String`
  `getServletPath()`
  The default behavior of this method is to return getServletPath() on the wrapped request object.
  `HttpSession`
  `getSession()`
  The default behavior of this method is to return getSession() on the wrapped request object.
  `HttpSession`
  `getSession(boolean create)`
  The default behavior of this method is to return getSession(boolean create) on the wrapped request object.
  `Map<String,String>`
  `getTrailerFields()`
  Obtain a Map of the trailer fields that is not backed by the request object.
  `Principal`
  `getUserPrincipal()`
  The default behavior of this method is to return getUserPrincipal() on the wrapped request object.
  `boolean`
  `isRequestedSessionIdFromCookie()`
  The default behavior of this method is to return isRequestedSessionIdFromCookie() on the wrapped request object.
  `boolean`
  `isRequestedSessionIdFromUrl()`
  Deprecated.
  As of Version 3.0 of the Java Servlet API
  `boolean`
  `isRequestedSessionIdFromURL()`
  The default behavior of this method is to return isRequestedSessionIdFromURL() on the wrapped request object.
  `boolean`
  `isRequestedSessionIdValid()`
  The default behavior of this method is to return isRequestedSessionIdValid() on the wrapped request object.
  `boolean`
  `isTrailerFieldsReady()`
  Are trailer fields ready to be read (there may still be no trailers to read).
  `boolean`
  `isUserInRole(String role)`
  The default behavior of this method is to return isUserInRole(String role) on the wrapped request object.
  `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.
  `PushBuilder`
  `newPushBuilder()`
  Obtain a builder for generating push requests.
  `<T extends HttpUpgradeHandler>
  T`
  `upgrade(Class<T> httpUpgradeHandlerClass)`
  Start the HTTP upgrade process and create and instance of the provided protocol handler class.

  ### Methods inherited from class javax.servlet.ServletRequestWrapper

  `getAsyncContext, getAttribute, getAttributeNames, getCharacterEncoding, getContentLength, getContentLengthLong, getContentType, getDispatcherType, getInputStream, getLocalAddr, getLocale, getLocales, getLocalName, getLocalPort, getParameter, getParameterMap, getParameterNames, getParameterValues, getProtocol, getReader, getRealPath, getRemoteAddr, getRemoteHost, getRemotePort, getRequest, getRequestDispatcher, getScheme, getServerName, getServerPort, getServletContext, isAsyncStarted, isAsyncSupported, isSecure, isWrapperFor, isWrapperFor, removeAttribute, setAttribute, setCharacterEncoding, setRequest, startAsync, startAsync`

  ### Methods inherited from class java.lang.Object

  `clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

  ### Methods inherited from interface javax.servlet.ServletRequest

  `getAsyncContext, getAttribute, getAttributeNames, getCharacterEncoding, getContentLength, getContentLengthLong, getContentType, getDispatcherType, getInputStream, getLocalAddr, getLocale, getLocales, getLocalName, getLocalPort, getParameter, getParameterMap, getParameterNames, getParameterValues, getProtocol, getReader, getRealPath, getRemoteAddr, getRemoteHost, getRemotePort, getRequestDispatcher, getScheme, getServerName, getServerPort, getServletContext, isAsyncStarted, isAsyncSupported, isSecure, removeAttribute, setAttribute, setCharacterEncoding, startAsync, startAsync`

- ## Constructor Details

  - ### HttpServletRequestWrapper

    public HttpServletRequestWrapper(HttpServletRequest request)
    Constructs a request object wrapping the given request.
    Parameters:
      `request` - The request to wrap
    Throws:
      `IllegalArgumentException` - if the request is null

- ## Method Details

  - ### getAuthType

    public String getAuthType()
    The default behavior of this method is to return getAuthType() on the wrapped request object.
    Specified by:
      `getAuthType` in interface `HttpServletRequest`
    Returns:
      one of the static members BASIC_AUTH, FORM_AUTH, CLIENT_CERT_AUTH, DIGEST_AUTH (suitable for == comparison) or the container-specific string indicating the authentication scheme, or `null` if the request was not authenticated.

  - ### getCookies

    public Cookie[] getCookies()
    The default behavior of this method is to return getCookies() on the wrapped request object.
    Specified by:
      `getCookies` in interface `HttpServletRequest`
    Returns:
      an array of all the `Cookies` included with this request, or `null` if the request has no cookies

  - ### getDateHeader

    public long getDateHeader(String name)
    The default behavior of this method is to return getDateHeader(String name) on the wrapped request object.
    Specified by:
      `getDateHeader` in interface `HttpServletRequest`
    Parameters:
      `name` - a `String` specifying the name of the header
    Returns:
      a `long` 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 request

  - ### getHeader

    public String getHeader(String name)
    The default behavior of this method is to return getHeader(String name) on the wrapped request object.
    Specified by:
      `getHeader` in interface `HttpServletRequest`
    Parameters:
      `name` - a `String` specifying the header name
    Returns:
      a `String` containing the value of the requested header, or `null` if the request does not have a header of that name

  - ### getHeaders

    public Enumeration<String> getHeaders(String name)
    The default behavior of this method is to return getHeaders(String name) on the wrapped request object.
    Specified by:
      `getHeaders` in interface `HttpServletRequest`
    Parameters:
      `name` - a `String` specifying the header name
    Returns:
      an `Enumeration` 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 null

  - ### getHeaderNames

    public Enumeration<String> getHeaderNames()
    The default behavior of this method is to return getHeaderNames() on the wrapped request object.
    Specified by:
      `getHeaderNames` in interface `HttpServletRequest`
    Returns:
      an enumeration of all the header names sent with this request; if the request has no headers, an empty enumeration; if the servlet container does not allow servlets to use this method, `null`

  - ### getIntHeader

    public int getIntHeader(String name)
    The default behavior of this method is to return getIntHeader(String name) on the wrapped request object.
    Specified by:
      `getIntHeader` in interface `HttpServletRequest`
    Parameters:
      `name` - a `String` specifying the name of a request header
    Returns:
      an integer expressing the value of the request header or -1 if the request doesn't have a header of this name

  - ### getHttpServletMapping

    public HttpServletMapping getHttpServletMapping()
    The default behavior of this method is to return `HttpServletRequest.getHttpServletMapping()` on the wrapped request object.
    Specified by:
      `getHttpServletMapping` in interface `HttpServletRequest`
    Returns:
      the mapping information for this request
    Since:
      Servlet 4.0

  - ### getMethod

    public String getMethod()
    The default behavior of this method is to return getMethod() on the wrapped request object.
    Specified by:
      `getMethod` in interface `HttpServletRequest`
    Returns:
      a `String` specifying the name of the method with which this request was made

  - ### getPathInfo

    public String getPathInfo()
    The default behavior of this method is to return getPathInfo() on the wrapped request object.
    Specified by:
      `getPathInfo` in interface `HttpServletRequest`
    Returns:
      a `String`, 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 information

  - ### getPathTranslated

    public String getPathTranslated()
    The default behavior of this method is to return getPathTranslated() on the wrapped request object.
    Specified by:
      `getPathTranslated` in interface `HttpServletRequest`
    Returns:
      a `String` specifying the real path, or `null` if the URL does not have any extra path information

  - ### getContextPath

    public String getContextPath()
    The default behavior of this method is to return getContextPath() on the wrapped request object.
    Specified by:
      `getContextPath` in interface `HttpServletRequest`
    Returns:
      a `String` specifying the portion of the request URI that indicates the context of the request

  - ### getQueryString

    public String getQueryString()
    The default behavior of this method is to return getQueryString() on the wrapped request object.
    Specified by:
      `getQueryString` in interface `HttpServletRequest`
    Returns:
      a `String` containing the query string or `null` if the URL contains no query string. The value is not decoded by the container.

  - ### getRemoteUser

    public String getRemoteUser()
    The default behavior of this method is to return getRemoteUser() on the wrapped request object.
    Specified by:
      `getRemoteUser` in interface `HttpServletRequest`
    Returns:
      a `String` specifying the login of the user making this request, or `null` if the user login is not known

  - ### isUserInRole

    public boolean isUserInRole(String role)
    The default behavior of this method is to return isUserInRole(String role) on the wrapped request object.
    Specified by:
      `isUserInRole` in interface `HttpServletRequest`
    Parameters:
      `role` - a `String` specifying the name of the role
    Returns:
      a `boolean` indicating whether the user making this request belongs to a given role; `false` if the user has not been authenticated

  - ### getUserPrincipal

    public Principal getUserPrincipal()
    The default behavior of this method is to return getUserPrincipal() on the wrapped request object.
    Specified by:
      `getUserPrincipal` in interface `HttpServletRequest`
    Returns:
      a `java.security.Principal` containing the name of the user making this request; `null` if the user has not been authenticated

  - ### getRequestedSessionId

    public String getRequestedSessionId()
    The default behavior of this method is to return getRequestedSessionId() on the wrapped request object.
    Specified by:
      `getRequestedSessionId` in interface `HttpServletRequest`
    Returns:
      a `String` specifying the session ID, or `null` if the request did not specify a session ID
    See Also:
      - `HttpServletRequest.isRequestedSessionIdValid()`

  - ### getRequestURI

    public String getRequestURI()
    The default behavior of this method is to return getRequestURI() on the wrapped request object.
    Specified by:
      `getRequestURI` in interface `HttpServletRequest`
    Returns:
      a `String` containing the part of the URL from the protocol name up to the query string
    See Also:
      - `HttpServletRequest.getRequestURL()`

  - ### getRequestURL

    public StringBuffer getRequestURL()
    The default behavior of this method is to return getRequestURL() on the wrapped request object.
    Specified by:
      `getRequestURL` in interface `HttpServletRequest`
    Returns:
      a `StringBuffer` object containing the reconstructed URL

  - ### getServletPath

    public String getServletPath()
    The default behavior of this method is to return getServletPath() on the wrapped request object.
    Specified by:
      `getServletPath` in interface `HttpServletRequest`
    Returns:
      a `String` 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.

  - ### getSession

    public HttpSession getSession(boolean create)
    The default behavior of this method is to return getSession(boolean create) on the wrapped request object.
    Specified by:
      `getSession` in interface `HttpServletRequest`
    Parameters:
      `create` - `true` to create a new session for this request if necessary; `false` to return `null` if there's no current session
    Returns:
      the `HttpSession` associated with this request or `null` if `create` is `false` and the request has no valid session
    See Also:
      - `HttpServletRequest.getSession()`

  - ### getSession

    public HttpSession getSession()
    The default behavior of this method is to return getSession() on the wrapped request object.
    Specified by:
      `getSession` in interface `HttpServletRequest`
    Returns:
      the `HttpSession` associated with this request
    See Also:
      - `HttpServletRequest.getSession(boolean)`

  - ### changeSessionId

    public String changeSessionId()
    The default behavior of this method is to call changeSessionId() on the wrapped request object.
    Specified by:
      `changeSessionId` in interface `HttpServletRequest`
    Returns:
      the new session ID allocated to the session
    Since:
      Servlet 3.1
    See Also:
      - `HttpSessionIdListener`

  - ### isRequestedSessionIdValid

    public boolean isRequestedSessionIdValid()
    The default behavior of this method is to return isRequestedSessionIdValid() on the wrapped request object.
    Specified by:
      `isRequestedSessionIdValid` in interface `HttpServletRequest`
    Returns:
      `true` if this request has an id for a valid session in the current session context; `false` otherwise
    See Also:
      - `HttpServletRequest.getRequestedSessionId()`
      - `HttpServletRequest.getSession(boolean)`

  - ### isRequestedSessionIdFromCookie

    public boolean isRequestedSessionIdFromCookie()
    The default behavior of this method is to return isRequestedSessionIdFromCookie() on the wrapped request object.
    Specified by:
      `isRequestedSessionIdFromCookie` in interface `HttpServletRequest`
    Returns:
      `true` if the session ID came in as a cookie; otherwise, `false`
    See Also:
      - `HttpServletRequest.getSession(boolean)`

  - ### isRequestedSessionIdFromURL

    public boolean isRequestedSessionIdFromURL()
    The default behavior of this method is to return isRequestedSessionIdFromURL() on the wrapped request object.
    Specified by:
      `isRequestedSessionIdFromURL` in interface `HttpServletRequest`
    Returns:
      `true` if the session ID came in as part of a URL; otherwise, `false`
    See Also:
      - `HttpServletRequest.getSession(boolean)`

  - ### isRequestedSessionIdFromUrl

    @Deprecated public boolean isRequestedSessionIdFromUrl()
    Deprecated.
    As of Version 3.0 of the Java Servlet API
    The default behavior of this method is to return isRequestedSessionIdFromUrl() on the wrapped request object.
    Specified by:
      `isRequestedSessionIdFromUrl` in interface `HttpServletRequest`
    Returns:
      `HttpServletRequest.isRequestedSessionIdFromURL()`

  - ### authenticate

    public boolean authenticate(HttpServletResponse response) throws IOException, ServletException
    Triggers the same authentication process as would be triggered if the request is for a resource that is protected by a security constraint.

    The default behavior of this method is to return `HttpServletRequest.authenticate(HttpServletResponse)` on the wrapped request object.

    Specified by:
      `authenticate` in interface `HttpServletRequest`
    Parameters:
      `response` - The response to use to return any authentication challenge
    Returns:
      `true` if the user is successfully authenticated and `false` if not
    Throws:
      `IOException` - if the authentication process attempted to read from the request or write to the response and an I/O error occurred
      `ServletException` - if the authentication failed and the caller is expected to handle the failure
    Since:
      Servlet 3.0

  - ### login

    public void login(String username, String password) throws ServletException
    Authenticate the provided user name and password and then associated the authenticated user with the request.

    The default behavior of this method is to return `HttpServletRequest.login(String, String)` on the wrapped request object.

    Specified by:
      `login` in interface `HttpServletRequest`
    Parameters:
      `username` - The user name to authenticate
      `password` - The password to use to authenticate the user
    Throws:
      `ServletException` - 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 fails
    Since:
      Servlet 3.0

  - ### logout

    public void logout() throws ServletException
    Removes any authenticated user from the request.

    The default behavior of this method is to return `HttpServletRequest.logout()` on the wrapped request object.

    Specified by:
      `logout` in interface `HttpServletRequest`
    Throws:
      `ServletException` - If the logout fails
    Since:
      Servlet 3.0

  - ### getParts

    public Collection<Part> getParts() throws IOException, ServletException
    Return a collection of all uploaded Parts.

    The default behavior of this method is to return `HttpServletRequest.getParts()` on the wrapped request object.

    Specified by:
      `getParts` in interface `HttpServletRequest`
    Returns:
      A collection of all uploaded Parts.
    Throws:
      `IOException` - if an I/O error occurs
      `ServletException` - if the request is not multipart/form-data
    Since:
      Servlet 3.0

  - ### getPart

    public Part getPart(String name) throws IOException, ServletException
    Gets the named Part or null if the Part does not exist. Triggers upload of all Parts.

    The default behavior of this method is to return `HttpServletRequest.getPart(String)` on the wrapped request object.

    Specified by:
      `getPart` in interface `HttpServletRequest`
    Parameters:
      `name` - The name of the Part to obtain
    Returns:
      The named Part or null if the Part does not exist
    Throws:
      `IOException` - if an I/O error occurs
      `ServletException` - if the request is not multipart/form-data
    Since:
      Servlet 3.0

  - ### upgrade

    public <T extends HttpUpgradeHandler> T upgrade(Class<T> httpUpgradeHandlerClass) throws IOException, ServletException
    Start the HTTP upgrade process and create and instance of the provided protocol handler class. The connection will be passed this instance once the current request/response pair has completed processing. Calling this method sets the response status to `HttpServletResponse.SC_SWITCHING_PROTOCOLS`.

    The default behavior of this method is to return `HttpServletRequest.upgrade(Class)` on the wrapped request object.

    Specified by:
      `upgrade` in interface `HttpServletRequest`
    Type Parameters:
      `T` - The type of the upgrade handler
    Parameters:
      `httpUpgradeHandlerClass` - The class that implements the upgrade handler
    Returns:
      A newly created instance of the specified upgrade handler type
    Throws:
      `IOException` - if an I/O error occurred during the upgrade
      `ServletException` - if the given httpUpgradeHandlerClass fails to be instantiated
    Since:
      Servlet 3.1

  - ### newPushBuilder

    public PushBuilder newPushBuilder()
    Obtain a builder for generating push requests. `PushBuilder` documents how this request will be used as the basis for a push request. Each call to this method will return a new instance, independent of any previous instance obtained.

    The default behavior of this method is to return `HttpServletRequest.newPushBuilder()` on the wrapped request object.

    Specified by:
      `newPushBuilder` in interface `HttpServletRequest`
    Returns:
      A builder that can be used to generate push requests based on this request or `null` if push is not supported. Note that even if a PushBuilder instance is returned, by the time that `PushBuilder.push()` is called, it may no longer be valid to push a request and the push request will be ignored.
    Since:
      Servlet 4.0

  - ### getTrailerFields

    public Map<String,String> getTrailerFields()
    Obtain a Map of the trailer fields that is not backed by the request object.

    The default behavior of this method is to return `HttpServletRequest.getTrailerFields()` on the wrapped request object.

    Specified by:
      `getTrailerFields` in interface `HttpServletRequest`
    Returns:
      A Map of the received trailer fields with all keys lower case or an empty Map if no trailers are present
    Since:
      Servlet 4.0

  - ### isTrailerFieldsReady

    public boolean isTrailerFieldsReady()
    Are trailer fields ready to be read (there may still be no trailers to read). This method always returns `true` if the underlying protocol does not support trailer fields. Otherwise, `true` is returned once all of the following are true:
    - The application has ready all the request data and an EOF has been received or the content-length is zero
    - All trailer fields, if any, have been received

    The default behavior of this method is to return `HttpServletRequest.isTrailerFieldsReady()` on the wrapped request object.

    Specified by:
      `isTrailerFieldsReady` in interface `HttpServletRequest`
    Returns:
      `true` if trailers are ready to be read
    Since:
      Servlet 4.0