+#if PHP_HTTP_CURL_VERSION(7,52,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "HTTPS_PROXY", CURL_VERSION_HTTPS_PROXY, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,56,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "MULTI_SSL", CURL_VERSION_MULTI_SSL, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,57,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "BROTLI", CURL_VERSION_BROTLI, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,64,1)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "ALTSVC", CURL_VERSION_ALTSVC, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,66,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "HTTP3", CURL_VERSION_HTTP3, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,72,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "ZSTD", CURL_VERSION_ZSTD, CONST_CS|CONST_PERSISTENT);
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "UNICODE", CURL_VERSION_UNICODE, CONST_CS|CONST_PERSISTENT);
+#endif
+#if PHP_HTTP_CURL_VERSION(7,74,0)
+ REGISTER_NS_LONG_CONSTANT("http\\Client\\Curl\\Features", "HSTS", CURL_VERSION_HSTS, CONST_CS|CONST_PERSISTENT);
+#endif
+