This question keeps coming back every time I review the exam objectives; what exactly triggers the HEAD request on the client side? Theoretically I know what HEAD does but can anybody point a practical example where HEAD is triggered? Thank you in advance, Adrian
posted 14 years ago
HEAD requests are generally generated by a browser with cacheing enabled. It is sent to the server to determine if the page currently cached has changed. If it hasn't, the page is reloaded from cache saving a lot of download time.