亚马逊 MWS - 计算的请求签名与提供的签名不匹配

从以下位置获取错误消息https://mws.amazonservices.com/:

<Type>Sender</Type>
<Code>SignatureDoesNotMatch</Code>
−
<Message>
The request signature we calculated does not match the signature you provided. Check your AWS Secret Access Key and signing method. Consult the service documentation for details.
</Message>

这是我用来计算请求的 VB.net 代码。出于安全原因，我已删除 SecretKey 和 AWSAccessKeyId。

Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Dim sURL As String = "https://mws.amazonservices.com/"

        Dim sRequest As String = ""
        sRequest &= "Acknowledged=" & Server.UrlEncode("false")
        sRequest &= "&Action=" & Server.UrlEncode("GetReportList")
        sRequest &= "&AWSAccessKeyId=" & Server.UrlEncode("REMOVED-FOR-SECURITY")
        sRequest &= "&Marketplace=" & Server.UrlEncode("REMOVED-FOR-SECURITY")
        sRequest &= "&Merchant=" & Server.UrlEncode("REMOVED-FOR-SECURITY")
        sRequest &= "&SignatureMethod=" & Server.UrlEncode("HmacSHA256")
        sRequest &= "&SignatureVersion=" & Server.UrlEncode("2")
        sRequest &= "&Timestamp=" & Server.UrlEncode(DateTime.Now.ToString("yyyy-MM-ddTHH:mm:ssCST"))
        sRequest &= "&Version=" & Server.UrlEncode("2009-01-01")

        Dim StringToSign As String = "GET\n" & "mws.amazonservices.com\n" & "/\n" & sRequest
        sRequest &= "&Signature=" & Server.UrlEncode(HashString(StringToSign))

        Response.Write("<a href=""" & sURL & "?" & sRequest & """>Click here</a>")

    End Sub

    Public Shared Function HashString(ByVal StringToHash As String) As String
        Dim myEncoder As New System.Text.UTF8Encoding
        Dim Key() As Byte = myEncoder.GetBytes("REMOVED-FOR-SECURITY")
        Dim XML() As Byte = myEncoder.GetBytes(StringToHash)
        Dim myHMACSHA256 As New System.Security.Cryptography.HMACSHA256(Key)
        Dim HashCode As Byte() = myHMACSHA256.ComputeHash(XML)
        Return Convert.ToBase64String(HashCode)
    End Function

如果您在开始阅读一些 Amazon 文档后从 Google 登陆这里，那么您很可能会看到上面的“请求签名”错误，这是由于您的秘密访问密钥上无意中出现的前导或尾随空格所致。首先检查一下！