OkHTTP Websocket：连接上的蒸汽意外结束

Question

我正在尝试连接到 Stack Exchange 聊天 Websocket。websocket 用于接收聊天中的新事件，例如新消息。

这是用于创建 Websocket 的代码：

String wsUrl = getWsUrl();
Request wsRequest = new Request.Builder()
        .url(wsUrl)
        .build();
WebSocketCall wsCall = WebSocketCall.create(httpClient, wsRequest);
wsCall.enqueue(new ChatWebSocketListener());

websocket URL 格式如下：

wss://chat.sockets.stackexchange.com/events/16/4b3a8a1f68704b8db35ce9f0915c7c45

WebSocketListeneronFailure仅接收响应，但有以下例外：

E/IOException? unexpected end of stream on Connection{chat.sockets.stackexchange.com:443, proxy=DIRECT@ hostAddress=192.111.0.32 cipherSuite=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 protocol=http/1.1} (recycle count=0)
    java.io.IOException: unexpected end of stream on Connection{chat.sockets.stackexchange.com:443, proxy=DIRECT@ hostAddress=192.111.0.32 cipherSuite=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 protocol=http/1.1} (recycle count=0)
            at com.squareup.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:211)
            at com.squareup.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:80)
            at com.squareup.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:917)
            at com.squareup.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:757)
            at com.squareup.okhttp.Call.getResponse(Call.java:274)
            at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:230)
            at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:201)
            at com.squareup.okhttp.Call.access$100(Call.java:36)
            at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:164)
            at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:831)
     Caused by: java.io.EOFException: \n not found: size=0 content=...
            at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:200)
            at com.squareup.okhttp.internal.http.HttpConnection.readResponse(HttpConnection.java:191)
            at com.squareup.okhttp.internal.http.HttpTransport.readResponseHeaders(HttpTransport.java:80)
            at com.squareup.okhttp.internal.http.HttpEngine.readNetworkResponse(HttpEngine.java:917)
            at com.squareup.okhttp.internal.http.HttpEngine.readResponse(HttpEngine.java:757)
            at com.squareup.okhttp.Call.getResponse(Call.java:274)
            at com.squareup.okhttp.Call$ApplicationInterceptorChain.proceed(Call.java:230)
            at com.squareup.okhttp.Call.getResponseWithInterceptorChain(Call.java:201)
            at com.squareup.okhttp.Call.access$100(Call.java:36)
            at com.squareup.okhttp.Call$AsyncCall.execute(Call.java:164)
            at com.squareup.okhttp.internal.NamedRunnable.run(NamedRunnable.java:33)
            at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)
            at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)
            at java.lang.Thread.run(Thread.java:831)

我不确定我在这里做错了什么，或者如何解释这个异常。这个 websocket 有什么问题，我该如何解决？

Answer 1

聊天 Websocket 服务器会忽略该请求，除非它同时具有以下两个条件：

• 一个 url param l，对应于加载事件列表时发送回的值。
• 标头Origin设置为"http://stackexchange.com".

您只需将这些添加到您的请求中：

Request wsRequest = new Request.Builder()
        .url(wsUrl+"?l=" + valueFromLoadingEvents)
        .addHeader("Origin", "http://stackexchange.com")
        .build();