bar . html "> mine ▁is ▁better </ a > ▁ ▁a ▁unique ▁string , ▁such ▁as ▁e 0 a 7 2 cb 2 a 2 c 7 ▁is ▁chosen , ▁and ▁the ▁page ▁is ▁modified ▁as ▁follows : ▁ ▁< a ▁href =" foo . html ? e 0 a 7 2 cb 2 a 2 c 7 "> see ▁my ▁page ! </ a > ▁ ▁< a ▁href =" bar . html ? e 0 a 7 2 cb 2 a 2 c 7 "> mine ▁is ▁better </ a > ▁ ▁The ▁addition ▁of ▁the ▁query ▁string ▁does ▁not ▁change ▁the ▁way ▁the ▁page ▁is ▁shown ▁to ▁the ▁user . ▁When ▁the ▁user ▁follows , ▁for ▁example , ▁the ▁first ▁link , ▁the ▁browser ▁requests ▁the ▁page ▁foo . html ? e 0 a 7 2 cb 2 a 2 c 7 ▁to ▁the ▁server , ▁which ▁ign ores ▁what ▁follows ▁? ▁and ▁sends ▁the ▁page ▁foo . html ▁as ▁expected , ▁adding ▁the ▁query ▁string ▁to ▁its ▁links ▁as ▁well . ▁ ▁This ▁way , ▁any ▁subsequent ▁page ▁request ▁from ▁this ▁user ▁will ▁carry ▁the ▁same ▁query ▁string ▁e 0 a 7 2 cb 2 a 2 c 7 , ▁making ▁it ▁possible ▁to ▁establish ▁that ▁all ▁these ▁pages ▁have ▁been ▁viewed ▁by ▁the ▁same ▁user . ▁Query ▁strings ▁are ▁often ▁used ▁in ▁association ▁with ▁web ▁be a cons . ▁ ▁The ▁main ▁differences ▁between ▁query ▁strings ▁used ▁for ▁tracking ▁and ▁HTTP ▁cookies ▁are ▁that : ▁ ▁Query