Read carefully the Ruby example in your own post here 

client = RPCClient.new(
  access_key_id:     '<accessKeyId>',
  access_key_secret: '<accessSecret>',
  endpoint: 'https://dysmsapi.aliyuncs.com',
  api_version: '2017-05-25'
)

[download]
access_key_id and access_key_secret are not the same

poj

In reply to Re^9: signature problem by poj
in thread signature problem by bigup401

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