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If-Unmodified-Since

Revision 1104575 by teoli on August 12, 2016 at 9:50:34 AM PDT

Revision 1104577 by teoli on August 12, 2016 at 9:50:50 AM PDT

Title:

If-Unmodified-Since

Slug:

Web/HTTP/Headers/If-Unmodified-Since

Tags:

"HTTP" "HTTP Headers" "Reference" "Request header"

Content:

	Revision 1104575			Revision 1104577
t	17	<li>In conjunction non-{{Glossary("safe")}} methods, like {	t	17	<li>In conjunction non-{{Glossary("safe")}} methods, like {
	>	{HTTPMethod("POST"}}, it can be used to implement an <a href="htt		>	{HTTPMethod("POST")}}, it can be used to implement an <a href="ht
	>	ps://en.wikipedia.org/wiki/Optimistic_concurrency_control">optimi		>	tps://en.wikipedia.org/wiki/Optimistic_concurrency_control">optim
	>	stic concurrency control</a>, like done by some wikis: editions a		>	istic concurrency control</a>, like done by some wikis: editions
	>	re rejected if the stored document has been modified since the or		>	are rejected if the stored document has been modified since the o
	>	iginal has been retrieved.		>	riginal has been retrieved.