+YAZ_EXPORT int yaz_decode_http_request(ODR o, Z_HTTP_Request **hr_p);
+YAZ_EXPORT int yaz_decode_http_response(ODR o, Z_HTTP_Response **hr_p);
+YAZ_EXPORT int yaz_encode_http_response(ODR o, Z_HTTP_Response *hr);
+YAZ_EXPORT int yaz_encode_http_request(ODR o, Z_HTTP_Request *hr);
+