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Signatures need to include the host header, but the requests library does not include it in prepared requests by default. Rather, it trusts that Python's HTTP client will compute and inject it when sending the request. This forces requests-aws4auth to compute how this header will look like.
A slight discrepancy between the implementations is that the code in this library unconditionally skips the port, whereas the request ending up being sent will include a port if it does not match the URL scheme's default.
This change adjusts the implementations to match in that regard.
Fixes #34