Example Client Side errors

Reason

The User-Agent header sent with the request was not in a valid format.

How to troubleshoot

Build the User-Agent header using code from the Amazon MWS client library or see the documentation for an acceptable format for the User-Agent header.

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<ErrorResponse xmlns="http://mws.amazonservices.com/doc/2009-01-01/">
  <Error>
    <Type>Sender</Type>
    <Code>UserAgentHeaderMalformed</Code>
    <Message>
      Problem with required MWS User-Agent header
      (e.g. "MyAppName/build123 (Language=Java/1.2)"):
      Encountered "<EOF>" at column 116.
      Was expecting: "=" ...
    </Message>
    <Detail/>
  </Error>
  <RequestID>
    21f197f6-24b7-4b7b-94fc-55fa34056d34
  </RequestID>
</ErrorResponse>

Reason

The client tried to communicate with the Amazon MWS endpoint, but it could not verify our SSL certificate or it could not find the certificate store on the client machine to use for verification.

How to troubleshoot

If you get this exception, you need to add Amazon MWS certificates to your client trust store. Consult the Java documentation regarding setting up and configuring Trust Stores in Java.

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javax.net.ssl.SSLException: java.lang.RuntimeException:
Unexpected error: java.security.
InvalidAlgorithmParameterException: the trustAnchors
parameter must be non-empty

Error message

The Content-MD5 HTTP header you passed for your feed
(1B2M2Y8AsgTpgAmY7PhCfg==) did not match the Content-MD5 we
calculated for your feed (3cldK7kqMxK6orwvXXdzSQ==)
            

MemoryStream stream =
  new MemoryStream(
    new UTF8Encoding()
      .GetBytes(
        xmlDocument.ToString()));
request.ContentMD5 =
  MarketplaceWebServiceClient
    .CalculateContentMD5(stream);