+PHP_HTTP_API void php_http_headers_to_callback(HashTable *headers, zend_bool crlf, php_http_pass_format_callback_t cb, void *cb_arg TSRMLS_DC);
+PHP_HTTP_API void php_http_headers_to_string(php_http_buffer_t *str, HashTable *headers TSRMLS_DC);
+
+PHP_HTTP_API zval *php_http_header_value_to_string(zval *header TSRMLS_DC);
+
+PHP_HTTP_API zend_class_entry *php_http_header_class_entry;
+PHP_MINIT_FUNCTION(http_header);
+