Fix constant pspec warnings

src/Core/HttpResult.vala

@@ -5,7 +5,7 @@ namespace Astralis {
 
     public abstract class HttpResult : Object {
         public Dictionary<string, string> headers { get; private set; }
-        public StatusCode status { get; set; }
+        public StatusCode status { get; set; default = StatusCode.OK; }
         public HttpResultFlag flags { get; set; }
         public uint64? content_length { get {
             return _content_length;