diff --git a/src/core/ngx_string.h b/src/core/ngx_string.h
index abef82d..7668807 100644
--- a/src/core/ngx_string.h
+++ b/src/core/ngx_string.h
@@ -72,6 +72,7 @@
 
 
 u_char *ngx_cpystrn(u_char *dst, u_char *src, size_t n);
+u_char *ngx_pstrdup(ngx_pool_t *pool, ngx_str_t *src);
 u_char *ngx_sprintf(u_char *buf, const char *fmt, ...);
 u_char *ngx_snprintf(u_char *buf, size_t max, const char *fmt, ...);
 u_char *ngx_vsnprintf(u_char *buf, size_t max, const char *fmt, va_list args);
@@ -93,10 +94,11 @@
 
 
 #define NGX_ESCAPE_URI   0
-#define NGX_ESCAPE_HTML  1
+#define NGX_ESCAPE_ARGS  1
+#define NGX_ESCAPE_HTML  2
 
-ngx_uint_t ngx_escape_uri(u_char *dst, u_char *src, size_t size,
-                          ngx_uint_t type);
+uintptr_t ngx_escape_uri(u_char *dst, u_char *src, size_t size,
+                         ngx_uint_t type);
 
 
 #define  ngx_qsort                qsort