Hi,
In short my question is: how to best ping a link to see if it is alive
or not?
Explanation:
I have a link as an attribute to my element. For example:
<foo src="helpmessage.txt"/>
During document load, I just want to ping the link to make sure it is
alive. If it isn't, I need to notify the user via an event if it is no
good. Later on, if the element is ever triggered (it is actually an xml
event handler), I'll pass the link URL as part of a long construction
string to nsIDOMWindowInternal's OpenDialog.
Currently I build a channel and if it is just a http channel I request
the head otherwise I'll request the whole thing. I thought that I could
be more efficient by not reading in the buffer during OnDataAvailable,
but rather just check the status code, etc. that comes back in
OnStopRequest. However, I've run into a problem where the
inputstreampump will return NS_ERROR_UNEXPECTED in the status code if I
don't read anything during OnDataAvailable
(http://lxr.mozilla.org/mozilla/source/netwerk/base/src/nsInputStreamPump.cpp#519)
So am I using the wrong approach to link pinging? Is there an easier way?
Any help appreciated.
Thanks,
--Aaron
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