[EMAIL PROTECTED] wrote:
> and "error" handler, QI it to nsIXMLHttpRequest and open an invalid
> URL

What sort of invalid URL?  Is it an invalid file:// URL, by any chance?

> when send(null) is called, an NS_ERROR_FILE_NOT_FOUND exception
> is thrown.  It is my understanding that send shouldn't throw
> exceptions for asynchronous connections

send() can always throw an exception (e.g. out of memory).  send() does 
not throw exceptions on network or parse errors except for synchronous 
connections.

-Boris
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