String to signGET
ecs.amazonaws.com
/onca/xml
AWSAccessKeyId=03PFDY6F9AMHFPR46982&AssociateTag=allacronyms-20&Keywords=EI%2FECSE&Operation=ItemSearch&ResponseGroup=Medium&SearchIndex=All&Service=AWSECommerceService&Timestamp=2009-11-08T20%3A12%3A12Z
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