var OSS = require('ali-oss');
var STS = OSS.STS;

var sts = new STS({
    accessKeyId: conf.AccessKeyId,
    accessKeySecret: conf.AccessKeySecret
  });

co(function* (){
    var token = yield sts.assumeRole(RoleArn,Policy,3600,'RoleSessionName');
    var client = new OSS.Wrapper({
      region: "oss-cn-beijing",
      accessKeyId: token.credentials.AccessKeyId,
      accessKeySecret: token.credentials.AccessKeySecret,
      stsToken: token.credentials.SecurityToken,
      bucket:"trtd"
    });
    res.send(client);
  }).catch(function (err) {
    console.log(err);
  });
代码如上，最后报错


{ [Error: SignatureDoesNotMatch: Specified signature is not matched with our calculation.]
  status: 400,
  code: 'SignatureDoesNotMatch',
  message: 'SignatureDoesNotMatch: Specified signature is not matched with our calculation.',