--- a/th_network.c	Sat Jun 21 05:11:06 2014 +0300
+++ b/th_network.c	Sat Jun 21 05:59:29 2014 +0300
@@ -149,7 +149,7 @@
 int th_conn_set_proxy(th_conn_t *conn, int type, int port, const char *host, int auth_type)
 {
     if (conn == NULL)
-        return -1;
+        return THERR_NULLPTR;
 
     conn->proxy.type = type;
     conn->proxy.port = port;
@@ -164,16 +164,16 @@
         th_get_addr(&(conn->proxy.addr), conn->proxy.hst);
     }
     else
-        return -2;
+        return THERR_INVALID_DATA;
 
-    return 0;
+    return THERR_OK;
 }
 
 
 int th_conn_set_proxy_auth_user(th_conn_t *conn, const char *userid, const char *passwd)
 {
     if (conn == NULL)
-        return -1;
+        return THERR_NULLPTR;
 
     th_free(conn->proxy.userid);
     conn->proxy.userid = th_strdup(userid);
@@ -181,7 +181,7 @@
     th_free(conn->proxy.passwd);
     conn->proxy.passwd = th_strdup(passwd);
 
-    return 0;
+    return THERR_OK;
 }