PHP_HTTP_API zval *_http_get_server_var_ex(const char *key, size_t key_size, zend_bool check TSRMLS_DC);
#define http_chunked_decode(e, el, d, dl) _http_chunked_decode((e), (el), (d), (dl) TSRMLS_CC)
-PHP_HTTP_API char *_http_chunked_decode(const char *encoded, size_t encoded_len, char **decoded, size_t *decoded_len TSRMLS_DC);
+PHP_HTTP_API const char *_http_chunked_decode(const char *encoded, size_t encoded_len, char **decoded, size_t *decoded_len TSRMLS_DC);
#define http_split_response(r, h, b) _http_split_response((r), (h), (b) TSRMLS_CC)
PHP_HTTP_API STATUS _http_split_response(zval *response, zval *headers, zval *body TSRMLS_DC);