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The client-side connection management and handling API that provides interfaces
and implementations for opening and managing client side HTTP connections.

The lowest layer of connection handling is comprised of {@link org.apache.http.conn.OperatedClientConnection OperatedClientConnection} and {@link org.apache.http.conn.ClientConnectionOperator ClientConnectionOperator}. The connection interface extends the core {@link org.apache.http.HttpClientConnection HttpClientConnection} by operations to set and update a socket. An operator encapsulates the logic to open and layer sockets, typically using a {@link org.apache.http.conn.scheme.SocketFactory}. The socket factory for a protocol {@link org.apache.http.conn.scheme.Scheme} such as "http" or "https" can be looked up in a {@link org.apache.http.conn.scheme.SchemeRegistry}. Applications without a need for sophisticated connection management can use this layer directly.

On top of that lies the connection management layer. A {@link org.apache.http.conn.ClientConnectionManager} internally manages operated connections, but hands out instances of {@link org.apache.http.conn.ManagedClientConnection}. This interface abstracts from the underlying socket operations and provides convenient methods for opening and updating sockets in order to establish a {@link org.apache.http.conn.routing.HttpRoute route}. The operator is encapsulated by the connection manager and called automatically.

Connections obtained from a manager have to be returned after use. This can be {@link org.apache.http.conn.ConnectionReleaseTrigger triggered} on various levels, either by releasing the {@link org.apache.http.conn.ManagedClientConnection connection} directly, or by calling a method on an {@link org.apache.http.conn.BasicManagedEntity entity} received from the connection, or by closing the {@link org.apache.http.conn.EofSensorInputStream stream} from which that entity is being read.

Connection managers will try to keep returned connections alive in order to re-use them for subsequent requests along the same route. The managed connection interface and all triggers for connection release provide methods to enable or disable this behavior.





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