botocore/serialize.py [217:224]:
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        host_prefix = self._expand_host_prefix(parameters, operation_model)
        if host_prefix is not None:
            serialized['host_prefix'] = host_prefix

        serialized = self._prepare_additional_traits(
            serialized, operation_model
        )
        return serialized
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botocore/serialize.py [353:360]:
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        host_prefix = self._expand_host_prefix(parameters, operation_model)
        if host_prefix is not None:
            serialized['host_prefix'] = host_prefix

        serialized = self._prepare_additional_traits(
            serialized, operation_model
        )
        return serialized
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