diff --git a/http.c b/http.c
index 8d693e0..50b50f3 100644
--- a/http.c
+++ b/http.c
@@ -1259,14 +1259,15 @@ Datum http_request(PG_FUNCTION_ARGS)
 
 
 /* URL Encode Escape Chars */
-/* 48-57 (0-9) 65-90 (A-Z) 97-122 (a-z) 95 (_) 45 (-) */
+/* 45-46 (-.) 48-57 (0-9) 65-90 (A-Z) */
+/* 95 (_) 97-122 (a-z) 126 (~) */
 
 static int chars_to_not_encode[] = {
 	0,0,0,0,0,0,0,0,0,0,
 	0,0,0,0,0,0,0,0,0,0,
 	0,0,0,0,0,0,0,0,0,0,
 	0,0,0,0,0,0,0,0,0,0,
-	0,0,0,0,0,1,0,0,1,1,
+	0,0,0,0,0,1,1,0,1,1,
 	1,1,1,1,1,1,1,1,0,0,
 	0,0,0,0,0,1,1,1,1,1,
 	1,1,1,1,1,1,1,1,1,1,
@@ -1274,7 +1275,7 @@ static int chars_to_not_encode[] = {
 	1,0,0,0,0,1,0,1,1,1,
 	1,1,1,1,1,1,1,1,1,1,
 	1,1,1,1,1,1,1,1,1,1,
-	1,1,1,0,0,0,0,0
+	1,1,1,0,0,0,1,0
 };