proxy_set_header Authorization $http_authorization;
                   proxy_set_header Content-Type $http_content_type;
                   proxy_set_header Content-Length $content_length;
                   proxy_set_header X-Amz-Date $http_x_amz_date;
                   proxy_set_header X-Amz-Expires $http_x_amz_expires;
                   proxy_set_header X-Amz-Cache-Control $http_x_amz_cache_control;
                   proxy_set_header X-Amz-Md5 $http_x_amz_md5;
                   proxy_set_header X-Amz-Algorithm $http_x_amz_algorithm;
                   proxy_set_header X-Amz-SignedHeaders $http_x_amz_signed_headers;