anchor.diff:  
   db_req(#httpd{method='POST', path_parts=[DbName], user_ctx=Ctx}=Req, Db) ->
       couch_httpd:validate_ctype(Req, "application/json"),
  +
  +    W = couch_httpd:qs_value(Req, "w", integer_to_list(mem3:quorum(Db))),
  +    Options = [{user_ctx,Ctx}, {w,W}],
  +
       Doc = couch_doc:from_json_obj(couch_httpd:json_body(Req)),
       Doc2 = case Doc#doc.id of
           <<"">> ->
  
positive.code:     couch_httpd:validate_referer(Req),
      couch_doc:validate_docid(DocId),
      couch_httpd:validate_ctype(Req, "multipart/form-data"),
      Form = couch_httpd:parse_form(Req),
      case proplists:is_defined("_doc", Form) of
      true ->
  
negative.code:     _Normal ->
          % normal
          DocUrl = absolute_uri(Req, [$/, DbName, $/, DocId]),
          case fabric:update_doc(Db, Doc2, Options) of
          {ok, NewRev} ->
              HttpCode = 201;
          {accepted, NewRev} ->
  