Readonly entityIDOptional 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.
Prepare this channel for resuming. The request will not start until asyncOpen or open is called. Calling resumeAt after open or asyncOpen has been called has undefined behaviour.
the starting offset, in bytes, to use to download
information about the file, to match before obtaining the file. Pass an empty string to use anything.
During OnStartRequest, this channel will have a status of NS_ERROR_NOT_RESUMABLE if the file cannot be resumed, eg because the server doesn't support this. This error may occur even if startPos is 0, so that the front end can warn the user. Similarly, the status of this channel during OnStartRequest may be NS_ERROR_ENTITY_CHANGED, which indicates that the entity has changed, as indicated by a changed entityID. In both of these cases, no OnDataAvailable will be called, and OnStopRequest will immediately follow with the same status code.
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The entity id for this URI. Available after OnStartRequest.
Throw
NS_ERROR_NOT_RESUMABLE if this load is not resumable.