I was asking that about images, but this can be a general issue.
Is it possible to get access on objects such as http pages or images without actually loading it. For example: retrieve image size without loading it.
(About images, What i found so far is no good: using the img tag or the Image object won't work, since the image has to load first (which happens asynchronously). On the other hand, using the onload function is also no good: i lose context till the loading is finished.)