I've downloaded Amazon's Marketplace SDK and I'm trying out one of the samples in the samples dir. However, I'm getting an exception with the following details whenever I try it:
Caught Exception: Internal Error
Response Status Code: 0
Error Code:
Error Type:
Request ID:
XML: RequestId: , ResponseContext: , Timestamp:
ResponseHeaderMetadata:
I have got CURL enabled with SSL as well. What am I doing wrong?
This answer is for future reference. For in-depth troubleshooting, see comments on the question.
The empty response indicates a failed connection to the Amazon server. In this case, HTTP worked fine, but HTTPS did not. As turning off CURLOPT_SSL_VERIFYPEER in the cURL settings solved the issue, it appears that the Amazon server was not using a valid SSL certificate.
Having CURLOPT_SSL_VERIFYPEER turned on checks if the requested host has a valid certificate and lets cURL return false if it doesn't. When CURLOPT_SSL_VERIFYPEER is off, invalid certificates (e.g., self-signed) are accepted and return the regular response.