Called when password authorization is needed.

  Called when password authorization is needed. Subclasses should
override the default implementation, which returns null.
Returns: The PasswordAuthentication collected from the user, or null if none is provided.

  Gets the hostname of the site or proxy requesting authentication, or null if not available.

  Gets the hostname of the
site or proxy requesting authentication, or null
if not available.
Returns: the hostname of the connection requiring authentication, or null if it's not available.
Since: 1.4

  Gets the port number for the requested connection.

  Gets the port number for the requested connection.
Returns: an int indicating the port for the requested connection.

  Gets the prompt string given by the requestor.

  Gets the prompt string given by the requestor.
Returns: the prompt string given by the requestor (realm for http requests)

  Give the protocol that's requesting the connection.

  Give the protocol that's requesting the connection. Often this
will be based on a URL, but in a future JDK it could be, for
example, "SOCKS" for a password-protected SOCKS5 firewall.
Returns: the protcol, optionally followed by "/version", where version is a version number.
See Also: URL.getProtocol(),

  Gets the scheme of the requestor (the HTTP scheme for an HTTP firewall, for example).

  Gets the scheme of the requestor (the HTTP scheme
for an HTTP firewall, for example).
Returns: the scheme of the requestor

  Gets the InetAddress of the site requesting authorization, or null if not available.

  Gets the InetAddress of the
site requesting authorization, or null
if not available.
Returns: the InetAddress of the site requesting authorization, or null if it's not available.

  Returns the URL that resulted in this request for authentication.

  Returns the URL that resulted in this
request for authentication.
Returns: the requesting URL
Since: 1.5

  Returns whether the requestor is a Proxy or a Server.

  Returns whether the requestor is a Proxy or a Server.
Returns: the authentication type of the requestor
Since: 1.5

  Ask the authenticator that has been registered with the system for a password.

  Ask the authenticator that has been registered with the system for a password.

First, if there is a security manager, its checkPermission method is called with a NetPermission("requestPasswordAuthentication") permission. This may result in a java.lang.SecurityException.
Returns: The username/password, or null if one can't be gotten.
Parameters:
- addr - The InetAddress of the site requesting authorization, or null if not known.
- port - the port for the requested connection
- protocol - The protocol that's requesting the connection ({@link java.net.Authenticator#getRequestingProtocol()})
- prompt - A prompt string for the user
- scheme - The authentication scheme
Throws:
- SecurityException - if a security manager exists and its checkPermission method doesn't allow the password authentication request.
See Also: SecurityManager.checkPermission(java.security.Permission), NetPermission,

  Ask the authenticator that has been registered with the system for a password.

  Ask the authenticator that has been registered with the system for a password. This is the preferred method for requesting a password because the hostname can be provided in cases where the InetAddress is not available.

First, if there is a security manager, its checkPermission method is called with a NetPermission("requestPasswordAuthentication") permission. This may result in a java.lang.SecurityException.
Returns: The username/password, or null if one can't be gotten.
Parameters:
- host - The hostname of the site requesting authentication.
- addr - The InetAddress of the site requesting authentication, or null if not known.
- port - the port for the requested connection.
- protocol - The protocol that's requesting the connection ({@link java.net.Authenticator#getRequestingProtocol()})
- prompt - A prompt string for the user which identifies the authentication realm.
- scheme - The authentication scheme
Throws:
- SecurityException - if a security manager exists and its checkPermission method doesn't allow the password authentication request.
Since: 1.4
See Also: SecurityManager.checkPermission(java.security.Permission), NetPermission,

  Ask the authenticator that has been registered with the system for a password.

  Ask the authenticator that has been registered with the system for a password.

First, if there is a security manager, its checkPermission method is called with a NetPermission("requestPasswordAuthentication") permission. This may result in a java.lang.SecurityException.
Returns: The username/password, or null if one can't be gotten.
Parameters:
- host - The hostname of the site requesting authentication.
- addr - The InetAddress of the site requesting authorization, or null if not known.
- port - the port for the requested connection
- protocol - The protocol that's requesting the connection ({@link java.net.Authenticator#getRequestingProtocol()})
- prompt - A prompt string for the user
- scheme - The authentication scheme
- url - The requesting URL that caused the authentication
- reqType - The type (server or proxy) of the entity requesting authentication.
Throws:
- SecurityException - if a security manager exists and its checkPermission method doesn't allow the password authentication request.
Since: 1.5
See Also: SecurityManager.checkPermission(java.security.Permission), NetPermission,

  Sets the authenticator that will be used by the networking code when a proxy or an HTTP server asks for authentication.

  Sets the authenticator that will be used by the networking code when a proxy or an HTTP server asks for authentication.

First, if there is a security manager, its checkPermission method is called with a NetPermission("setDefaultAuthenticator") permission. This may result in a java.lang.SecurityException.
Parameters:
- a - The authenticator to be set. If a is null then any previously set authenticator is removed.
Throws:
- SecurityException - if a security manager exists and its checkPermission method doesn't allow setting the default authenticator.
See Also: SecurityManager.checkPermission(java.security.Permission), NetPermission,