Fix URL encoding bug around AWS v4 auth [JIRA: RCS-203] #1141
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AWS v4 auth defined URL encoding algorithm that is used for
generating signature. Mochiweb's utility function convert
space (" ") to plus ("+") but AWS spec says it should be
percent encoded. i.e. "%20".
This commit fixes the encoding bug for resource (URL path) and
query parameters.
This PR only affects AWS v4 authentication path that is still preliminary support.
cf.
Authenticating Requests by Using the Authorization Header
(Compute Checksum of the Entire Payload Prior to Transmission)
http://docs.aws.amazon.com/ja_jp/AmazonS3/latest/API/sig-v4-header-based-auth.html