REQUEST FOR POLICY
http://127.0.0.1:8001/api/s3/policy?s3_object_type=image/jpeg&s3_object_name=UaudwHr.jpg

POLICY RESPONSE
{"signed_request":"https://arenaupload.s3.amazonaws.com/UaudwHr.jpg?AWSAccessKeyId=AKIAJ5GX5PADZO75CIJQ&Content-Type=image%2Fjpeg&Expires=1390734087&Signature=yN9msT3L%2FYqxhQLM4v8yl2Ba73E%3D","url":"http://arenaupload.s3.amazonaws.com/UaudwHr.jpg"}

REQUEST TO AMAZON
https://arenaupload.s3.amazonaws.com/UaudwHr.jpg?AWSAccessKeyId=AKIAJ5GX5PADZO75CIJQ&Content-Type=image%2Fjpeg&Expires=1390734087&Signature=yN9msT3L%2FYqxhQLM4v8yl2Ba73E%3D

RESPONSE FROM AMAZON
<?xml version="1.0" encoding="UTF-8"?>
<Error><Code>SignatureDoesNotMatch</Code><Message>The request signature we calculated does not match the signature you provided. Check your key and signing method.</Message><StringToSignBytes>50 55 54 0a 0a 69 6d 61 67 65 2f 6a 70 65 67 0a 31 33 39 30 37 33 33 37 32 39 0a 78 2d 61 6d 7a 2d 61 63 6c 3a 70 75 62 6c 69 63 2d 72 65 61 64 0a 2f 61 72 65 6e 61 75 70 6c 6f 61 64 2f 76 56 36 31 35 33 36 2e 6a 70 67</StringToSignBytes><RequestId>8BCC59E0D6968505</RequestId><HostId>V/a4EzLvOwcDLCR+M/6uYO9P8lrMeKuzYEtYfcTBIKtFMgDqHF7uUt7aMa+H5LBR</HostId><SignatureProvided>UmEhL6BcHzzdKNs/caHZxPPMUxM=</SignatureProvided><StringToSign>PUT

image/jpeg
1390733729
x-amz-acl:public-read
/arenaupload/vV61536.jpg</StringToSign><AWSAccessKeyId>AKIAJ5GX5PADZO75CIJQ</AWSAccessKeyId></Error>