Big upload has to be allowed on server side

T605-046

If upload size could be more than Upload_Size_Limit, the server side has to
check Status.Is_Body_Uploaded and call Server.Get_Message_Body if necessary.

Author: anisimkov

regtests/0326_big_post/big_post.adb

@@ -44,6 +44,10 @@ procedure Big_Post is
 
    function CB (Request : Status.Data) return Response.Data is
    begin
+      if not Status.Is_Body_Uploaded (Request) then
+         Server.Get_Message_Body;
+      end if;
+
       Text_IO.Put_Line
         ("Length payload: " & Status.Content_Length (Request)'Img);
       return Response.Build (MIME.Text_HTML, "ok");