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WebSocket onerror-エラーの説明の読み方

私はしばらくの間、ブラウザベースのマルチプレイヤーゲームを開発しており、さまざまな環境(クライアントのオフィス、公衆無線LANなど)でさまざまなポートのアクセシビリティをテストしています。すべてが順調に進んでいますが、1つだけ例外があります。エラーnoの読み方がわかりません。またはonerrorイベントを受け取ったときの説明。

クライアントwebsocketはjavascriptで行われます。

例えば:

// Init of websocket
websocket = new WebSocket(wsUri);
websocket.onerror = OnSocketError;
...etc...

// Handler for onerror:
function OnSocketError(ev)
{
    output("Socket error: " + ev.data);
}

「出力」は、divに書き込む単なるユーティリティ関数です。

私が得ているのは、ev.dataの「未定義」です。常に。そして、私はあちこち探していましたが、このイベントがどのようなパラメーターを持ち、どのように適切に読み取るかについての仕様はないようです。

どんな助けも大歓迎です!

64
Sinisa

Eventハンドラーが受け取るエラーonerrorは、そのような情報を含まない単純なイベントです

ユーザーエージェントがWebSocket接続に失敗する必要がある場合、またはWebSocket接続が偏見で閉じられた場合、WebSocketオブジェクトでerrorという名前の単純なイベントを発生させます。

closeイベントをリッスンしている方が幸いかもしれません。これは CloseEvent であり、実際には RFC 6455 11.7 に従う数値コードを含むCloseEvent.codeプロパティがありますおよびCloseEvent.reason文字列プロパティ。

ただし、CloseEvent.code(およびCloseEvent.reasonは、ネットワークプローブやその他のセキュリティ問題が回避されるように制限されています

64
nmaier

Nmaierの答えと並んで、彼が言ったように 常にコード1006を受け取ります 。ただし、理論的に他のコードを受け取ることになった場合、結果を表示するコードを以下に示します( RFC6455 を使用)。

実際にはこれらのコードを取得することはほとんどないので、このコードはほとんど無意味です

var websocket;
if ("WebSocket" in window)
{
    websocket = new WebSocket("ws://yourDomainNameHere.org/");

    websocket.onopen = function (event) {
        $("#thingsThatHappened").html($("#thingsThatHappened").html() + "<br />" + "The connection was opened");
    };
    websocket.onclose = function (event) {
        var reason;
        alert(event.code);
        // See http://tools.ietf.org/html/rfc6455#section-7.4.1
        if (event.code == 1000)
            reason = "Normal closure, meaning that the purpose for which the connection was established has been fulfilled.";
        else if(event.code == 1001)
            reason = "An endpoint is \"going away\", such as a server going down or a browser having navigated away from a page.";
        else if(event.code == 1002)
            reason = "An endpoint is terminating the connection due to a protocol error";
        else if(event.code == 1003)
            reason = "An endpoint is terminating the connection because it has received a type of data it cannot accept (e.g., an endpoint that understands only text data MAY send this if it receives a binary message).";
        else if(event.code == 1004)
            reason = "Reserved. The specific meaning might be defined in the future.";
        else if(event.code == 1005)
            reason = "No status code was actually present.";
        else if(event.code == 1006)
           reason = "The connection was closed abnormally, e.g., without sending or receiving a Close control frame";
        else if(event.code == 1007)
            reason = "An endpoint is terminating the connection because it has received data within a message that was not consistent with the type of the message (e.g., non-UTF-8 [http://tools.ietf.org/html/rfc3629] data within a text message).";
        else if(event.code == 1008)
            reason = "An endpoint is terminating the connection because it has received a message that \"violates its policy\". This reason is given either if there is no other sutible reason, or if there is a need to hide specific details about the policy.";
        else if(event.code == 1009)
           reason = "An endpoint is terminating the connection because it has received a message that is too big for it to process.";
        else if(event.code == 1010) // Note that this status code is not used by the server, because it can fail the WebSocket handshake instead.
            reason = "An endpoint (client) is terminating the connection because it has expected the server to negotiate one or more extension, but the server didn't return them in the response message of the WebSocket handshake. <br /> Specifically, the extensions that are needed are: " + event.reason;
        else if(event.code == 1011)
            reason = "A server is terminating the connection because it encountered an unexpected condition that prevented it from fulfilling the request.";
        else if(event.code == 1015)
            reason = "The connection was closed due to a failure to perform a TLS handshake (e.g., the server certificate can't be verified).";
        else
            reason = "Unknown reason";

        $("#thingsThatHappened").html($("#thingsThatHappened").html() + "<br />" + "The connection was closed for reason: " + reason);
    };
    websocket.onmessage = function (event) {
        $("#thingsThatHappened").html($("#thingsThatHappened").html() + "<br />" + "New message arrived: " + event.data);
    };
    websocket.onerror = function (event) {
        $("#thingsThatHappened").html($("#thingsThatHappened").html() + "<br />" + "There was an error with your websocket.");
    };
}
else
{
    alert("Websocket is not supported by your browser");
    return;
}

websocket.send("Yo wazzup");

websocket.close();

http://jsfiddle.net/gr0bhrqr/ を参照してください

77
Phylliida