botocore/crt/auth.py [380:405]:
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    DEFAULT_EXPIRES = 3600
    _SIGNATURE_TYPE = awscrt.auth.AwsSignatureType.HTTP_REQUEST_QUERY_PARAMS

    def __init__(self, credentials, service_name, region_name,
                 expires=DEFAULT_EXPIRES):
        super().__init__(credentials, service_name, region_name)
        self._expiration_in_seconds = expires

    def _modify_request_before_signing(self, request):
        super()._modify_request_before_signing(request)

        # We automatically set this header, so if it's the auto-set value we
        # want to get rid of it since it doesn't make sense for presigned urls.
        content_type = request.headers.get('content-type')
        if content_type == 'application/x-www-form-urlencoded; charset=utf-8':
            del request.headers['content-type']

        # Now parse the original query string to a dict, inject our new query
        # params, and serialize back to a query string.
        url_parts = urlsplit(request.url)
        # parse_qs makes each value a list, but in our case we know we won't
        # have repeated keys so we know we have single element lists which we
        # can convert back to scalar values.
        query_dict = dict(
            [(k, v[0]) for k, v in
             parse_qs(url_parts.query, keep_blank_values=True).items()])
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botocore/crt/auth.py [470:495]:
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    DEFAULT_EXPIRES = 3600
    _SIGNATURE_TYPE = awscrt.auth.AwsSignatureType.HTTP_REQUEST_QUERY_PARAMS

    def __init__(self, credentials, service_name, region_name,
                 expires=DEFAULT_EXPIRES):
        super().__init__(credentials, service_name, region_name)
        self._expiration_in_seconds = expires

    def _modify_request_before_signing(self, request):
        super()._modify_request_before_signing(request)

        # We automatically set this header, so if it's the auto-set value we
        # want to get rid of it since it doesn't make sense for presigned urls.
        content_type = request.headers.get('content-type')
        if content_type == 'application/x-www-form-urlencoded; charset=utf-8':
            del request.headers['content-type']

        # Now parse the original query string to a dict, inject our new query
        # params, and serialize back to a query string.
        url_parts = urlsplit(request.url)
        # parse_qs makes each value a list, but in our case we know we won't
        # have repeated keys so we know we have single element lists which we
        # can convert back to scalar values.
        query_dict = dict(
            [(k, v[0]) for k, v in
             parse_qs(url_parts.query, keep_blank_values=True).items()])
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