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嘿，我正在尝试让我正在制作的网站向用户发送一个 cookie，然后显示一个网页。

所以我发现http://alexmarandon.com/articles/mochiweb_tutorial/作为关于如何制作 cookie 的唯一真正教程，但它似乎对我来说是错误的。

我的循环看起来像这样（我的 make_cookie、get_cookie_value、render_ok 和 get_username 与他的相同，只是我使用 'mename' 作为键而不是 'username'）：

loop(Req, DocRoot) ->
"/" ++ Path = Req:get(path),
try
    case dispatch(Req, valid_urls:urls()) of
        none -> 
            case filelib:is_file(filename:join([DocRoot, Path])) of
                true -> 
        %% If there's a static file, serve it
                    Req:serve_file(Path, DocRoot);
                false ->
        %% Otherwise the page is not found
                    case Req:get(method) of
                        Method when Method =:= 'GET'; Method =:= 'HEAD' ->
                            case Path of
                                "response" ->
                                    QueryStringData = Req:parse_qs(),

                                    Username = get_username(Req, QueryStringData),
                                    Cookie = make_cookie(Username),

                                    FindCookie = get_cookie_value(Req,"mename","Not Found."),
                                    % render_ok(Req, [Cookie], greeting_dtl, [{username, Username}]),

                                    Req:respond({200, [{"Content-Type", "text/html"}],
                                                "<html><p>Webpage</p></hmtl>"});
                                _ ->
                                    Req:not_found()
                            end
                    end
            end;
        Response -> 
            Response
    end
catch
Type:What ->
        Report = ["web request failed",
                  {path, Path},
                  {type, Type}, {what, What},
                  {trace, erlang:get_stacktrace()}],
        error_logger:error_report(Report),
        %% NOTE: mustache templates need \ because they are not awesome.
        Req:respond({500, [{"Content-Type", "text/plain"}],
                     "request failed, sorry\n"})
end.

我得到的错误是：

[error] "web request failed", path: "response", type: error, what: undef, trace: [{greeting_dtl,render,[[{username,"GET"}]],[]}

该错误似乎来自render_ok，但是对于Erlang-mochiweb来说是新手，我不确定如何解决这个问题。

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1 回答 1

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You have render_ok commented out, but the file was not compiled after that. The error message suggests, that it still calls greeting_dtl.

I assume you are using erlydtl, because the error is in greeting_dtl. Errors in render function usually mean, that you misspelled some property name. Check, where your template is and if it has something like {{ something.username }}. Comment it out or change to mename (whatever makes sense).

于 2014-11-25T06:04:00.167 回答