nsIChannelEventSink in Firefox 3.5

Implemented by

 Implement this interface to receive control over various channel events.
 Channels will try to get this interface from a channel's
 notificationCallbacks or, if not available there, from the loadGroup's
 notificationCallbacks.

 These methods are called before onStartRequest, and should be handled
 SYNCHRONOUSLY.

[scriptable, uuid(6757d790-2916-498e-aaca-6b668a956875)]

Constants

 This is a temporary redirect. New requests for this resource should
 continue to use the URI of the old channel.

 The new URI may be identical to the old one.

const unsigned long REDIRECT_TEMPORARY = 1

 This is a permanent redirect. New requests for this resource should use
 the URI of the new channel (This might be an HTTP 301 reponse).
 If this flag is not set, this is a temporary redirect.

 The new URI may be identical to the old one.

const unsigned long REDIRECT_PERMANENT = 2

 This is an internal redirect, i.e. it was not initiated by the remote
 server, but is specific to the channel implementation.

 The new URI may be identical to the old one.

const unsigned long REDIRECT_INTERNAL = 4

Methods

 Called when a redirect occurs. This may happen due to an HTTP 3xx status
 code.

 @param oldChannel
        The channel that's being redirected.
 @param newChannel
        The new channel. This channel is not opened yet.
 @param flags
        Flags indicating the type of redirect. A bitmask consisting
        of flags from above.
        One of REDIRECT_TEMPORARY and REDIRECT_PERMANENT will always be
        set.

 @throw <any> Throwing an exception will cancel the load. No network
 request for the new channel will be made.

void onChannelRedirect(in nsIChannel oldChannel, in nsIChannel newChannel, in unsigned long flags)