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HEAD again...

 
Adrian Muscalu
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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
 
Carl Trusiak
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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.
 
Adrian Muscalu
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Yes, it did help. Thank you.
 
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