shadows/httpclient/src/main/java/org/robolectric/shadows/httpclient/DefaultRequestDirector.java
protected void releaseConnection() {
    // Release the connection through the ManagedConnection instead of the
    // ConnectionManager directly.  This lets the connection control how
    // it is released.
    try {
      managedConn.releaseConnection();
    } catch(IOException ignored) {
      this.log.debug("IOException releasing connection", ignored);
    }
    managedConn = null;
  }
protected void releaseConnection() {
    // Release the connection through the ManagedConnection instead of the
    // ConnectionManager directly.  This lets the connection control how
    // it is released.
    try {
      managedConn.releaseConnection();
    } catch(IOException ignored) {
      this.log.debug("IOException releasing connection", ignored);
    }
    managedConn = null;
  }
Returns the connection back to the connection manager
and prepares for retrieving a new connection during
the next request.