A couple of weeks ago I start working with Amazon Web Services. Very, very powerful. I just work with a few features like EC2 and S3 but I love it. There are APIs in most language (Java, PHP, ...) to use the Amazon WS.
Anyway, this post is a reminder for all of you that want to implement an API for AWS in some other language (like me and CFML).
Extracted from http://docs.amazonwebservices.com/AWSEC2/2008-08-08/DeveloperGuide/ I copy the sentence that solve my headache:
Sort the query parameters (not URL-encoded) without using case-sensitively.
When you invoke some AWS action the params must be sorted by its name.
Be happy and read the doc.
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