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## org.apache.http.conn.routing
Interface HttpRouteDirector

All Known Implementing Classes:
  BasicRouteDirector

    public interface HttpRouteDirector

Provides directions on establishing a route. Implementations of this interface compare a planned route with a tracked route and indicate the next step required.

Since:
  4.0

Field Summary
`static int` | `COMPLETE` Indicates that the route is complete.
`static int` | `CONNECT_PROXY` Step: open connection to proxy.
`static int` | `CONNECT_TARGET` Step: open connection to target.
`static int` | `LAYER_PROTOCOL` Step: layer protocol (over tunnel).
`static int` | `TUNNEL_PROXY` Step: tunnel through proxy to other proxy.
`static int` | `TUNNEL_TARGET` Step: tunnel through proxy to target.
`static int` | `UNREACHABLE` Indicates that the route can not be established at all.

Method Summary
`int` | `nextStep(RouteInfo plan, RouteInfo fact)` Provides the next step.

Field Detail

### UNREACHABLE

    static final int UNREACHABLE

  Indicates that the route can not be established at all.

  See Also:
    Constant Field Values

### COMPLETE

    static final int COMPLETE

  Indicates that the route is complete.

  See Also:
    Constant Field Values

### CONNECT_TARGET

    static final int CONNECT_TARGET

  Step: open connection to target.

  See Also:
    Constant Field Values

### CONNECT_PROXY

    static final int CONNECT_PROXY

  Step: open connection to proxy.

  See Also:
    Constant Field Values

### TUNNEL_TARGET

    static final int TUNNEL_TARGET

  Step: tunnel through proxy to target.

  See Also:
    Constant Field Values

### TUNNEL_PROXY

    static final int TUNNEL_PROXY

  Step: tunnel through proxy to other proxy.

  See Also:
    Constant Field Values

### LAYER_PROTOCOL

    static final int LAYER_PROTOCOL

  Step: layer protocol (over tunnel).

  See Also:
    Constant Field Values

Method Detail

### nextStep

    int nextStep(RouteInfo plan,
                 RouteInfo fact)

  Provides the next step.

  Parameters:
    `plan` - the planned route
    `fact` - the currently established route, or `null` if nothing is established
  Returns:
    one of the constants defined in this interface, indicating either the next step to perform, or success, or failure. 0 is for success, a negative value for failure.

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