Optional aInstancePtr: objectA run time mechanism for interface discovery.
NS_OK if the interface is supported by the associated instance, NS_NOINTERFACE if it is not.
aInstancePtr must not be null.
[in] A requested interface IID
[out] A pointer to an interface pointer to receive the result.
Called when a redirect occurs. This may happen due to an HTTP 3xx status code. The purpose of this method is to notify the sink that a redirect is about to happen, but also to give the sink the right to veto the redirect by throwing or passing a failure-code in the callback.
Note that vetoing the redirect simply means that |newChannel| will not be opened. It is important to understand that |oldChannel| will continue loading as if it received a HTTP 200, which includes notifying observers and possibly display or process content attached to the HTTP response. If the sink wants to prevent this loading it must explicitly deal with it, e.g. by calling |oldChannel->Cancel()|
There is a certain freedom in implementing this method:
If the return-value indicates success, a callback on |callback| is required. This callback can be done from within asyncOnChannelRedirect (effectively making the call synchronous) or at some point later (making the call asynchronous). Repeat: A callback must be done if this method returns successfully.
If the return value indicates error (method throws an exception) the redirect is vetoed and no callback must be done. Repeat: No callback must be done if this method throws!
NOTE: originalURI isn't yet set on the new channel when asyncOnChannelRedirect is called.
nsIAsyncVerifyRedirectCallback::onRedirectVerifyCallback()
The channel that's being redirected.
The new channel. This channel is not opened yet.
Flags indicating the type of redirect. A bitmask consisting of flags from above. One of REDIRECT_TEMPORARY and REDIRECT_PERMANENT will always be set.
Object to inform about the async result of this method
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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.