botocore/crt/auth.py [454:466]:
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    _USE_DOUBLE_URI_ENCODE = False
    _SHOULD_NORMALIZE_URI_PATH = False

    def _should_sha256_sign_payload(self, request):
        # From the doc link above:
        # "You don't include a payload hash in the Canonical Request, because
        # when you create a presigned URL, you don't know anything about the
        # payload. Instead, you use a constant string "UNSIGNED-PAYLOAD".
        return False

    def _should_add_content_sha256_header(self, explicit_payload):
        # Never add X-Amz-Content-SHA256 header
        return False
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botocore/crt/auth.py [549:561]:
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    _USE_DOUBLE_URI_ENCODE = False
    _SHOULD_NORMALIZE_URI_PATH = False

    def _should_sha256_sign_payload(self, request):
        # From the doc link above:
        # "You don't include a payload hash in the Canonical Request, because
        # when you create a presigned URL, you don't know anything about the
        # payload. Instead, you use a constant string "UNSIGNED-PAYLOAD".
        return False

    def _should_add_content_sha256_header(self, explicit_payload):
        # Never add X-Amz-Content-SHA256 header
        return False
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