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        SignatureVersion => '1.0',
        SignatureNonce   => $uuid,
        AccessKeyId => $self->access_key,
        $self->region_id ? (RegionId => $self->region_id) : (),
        $params ? %$params : (),
    );

    # say Dumper(\%auth_params); use Data::Dumper;

    # Thanks to https://github.com/lemontv/AliyunPerlLib/blob/master/Aliyun/Auth.pm
    my %dumb = %auth_params; $dumb{Timestamp} = uri_escape($dumb{Timestamp});
    my @tmps = map { join('=', $_, $dumb{$_}) } sort keys(%dumb);
    my $StringToSign = join("&",  @tmps);
    $StringToSign = join('&', $method, uri_escape($path), uri_escape($StringToSign));
    my $Signature = hmac_sha1_base64($StringToSign, $self->access_secret . '&');
    $auth_params{Signature} = $Signature . '=';

    my $tx = $self->ua->build_tx($method => $url => form => \%auth_params );
    $tx = $self->ua->start($tx);

    return $tx->res->json if ($tx->res->headers->content_type || '') =~ /json/;

    my $err = $tx->error;
    croak "$err->{code} response: $err->{message}" if $err->{code};