Called to indicate that a connection could not be established to a proxy/socks server.

  Called to indicate that a connection could not be established
to a proxy/socks server. An implementation of this method can
temporarily remove the proxies or reorder the sequence of
proxies returned by select(String, String), using the address
and they kind of IOException given.
Parameters:
- uri - The URI that the proxy at sa failed to serve.
- sa - The socket address of the proxy/SOCKS server
- ioe - The I/O exception thrown when the connect failed.
Throws:
- IllegalArgumentException - if either argument is null

  Gets the system-wide proxy selector.

  Gets the system-wide proxy selector.
Returns: the system-wide ProxySelector
Throws:
- SecurityException - If a security manager has been installed and it denies {@link NetPermission}("getProxySelector")
Since: 1.5
See Also: ProxySelector.setDefault(ProxySelector),

  Selects all the applicable proxies based on the protocol to access the resource with and a destination address to access the resource at.

  Selects all the applicable proxies based on the protocol to
access the resource with and a destination address to access
the resource at.
The format of the URI is defined as follow:

• http URI for http connections


• https URI for https connections
  
• ftp URI for ftp connections


• socket://host:port
  
  for tcp client sockets connections

Returns: a List of Proxies. Each element in the the List is of type {@link java.net.Proxy Proxy}; when no proxy is available, the list will contain one element of type {@link java.net.Proxy Proxy} that represents a direct connection.
Parameters:
- uri - The URI that a connection is required to
Throws:
- IllegalArgumentException - if either argument is null

  Sets (or unsets) the system-wide proxy selector.

  Sets (or unsets) the system-wide proxy selector.

Note: non-standard protocol handlers may ignore this setting.
Parameters:
- ps - The HTTP proxy selector, or null to unset the proxy selector.
Throws:
- SecurityException - If a security manager has been installed and it denies {@link NetPermission}("setProxySelector")
Since: 1.5
See Also: ProxySelector.getDefault(),