WebSocket connection failed: One or more reserved bits are on: reserved1 = 0, reserved2 = 1, reserved3 = 1

I am trying to setup WebSockets in my Javascript (React) application using Socket.io.

When using the polling transport from the Socket.io client (v1.4.5), everything works fine. But I would like to use actual and secure WebSockets (wss:// protocol)...

My server is a Debian 7 running Nginx v1.2.1 as a proxy for my virtual hosts, and my Node.js app (using Socket.io v1.4.5).

My domain name (api.tribeez.net) is set up via CloudFlare, which just announced full WebSocket support (including over SSL, i.e. wss://).

When I start my app in Chrome (v50.0), I see the WebSocket connection in the Network panel of Chrome (status pending). But after one minute, the WebSocket disconnects (status 101 Switching Protocols) and the console throws me a confusing WebSocket connection to 'wss://api.tribeez.net/socket.io/?EIO=3&transport=websocket&t=LI3t1dh' failed: One or more reserved bits are on: reserved1 = 0, reserved2 = 1, reserved3 = 1

When turning on socket.io debugging, this is what I get:

Fri, 06 May 2016 02:23:37 GMT socket.io:server incoming connection with id L43EOXmwsqkgCMVJAAAD
Fri, 06 May 2016 02:23:37 GMT socket.io:client connecting to namespace /
Fri, 06 May 2016 02:23:37 GMT socket.io:namespace adding socket to nsp /
Fri, 06 May 2016 02:23:37 GMT socket.io:socket socket connected - writing packet
Fri, 06 May 2016 02:23:37 GMT socket.io:socket joining room /#L43EOXmwsqkgCMVJAAAD
Fri, 06 May 2016 02:23:37 GMT socket.io:client writing packet {"type":0,"nsp":"/"}
Fri, 06 May 2016 02:23:37 GMT socket.io-parser encoding packet {"type":0,"nsp":"/"}
Fri, 06 May 2016 02:23:37 GMT socket.io-parser encoded {"type":0,"nsp":"/"} as 0
Transport=websocket, query=/socket.io/?EIO=3&transport=websocket&t=LI3t1dh
Fri, 06 May 2016 02:23:37 GMT socket.io:socket joined room /#L43EOXmwsqkgCMVJAAAD
Fri, 06 May 2016 02:23:37 GMT socket.io:socket joining room tribe#1
Fri, 06 May 2016 02:23:37 GMT socket.io:socket joined room tribe#1
Fri, 06 May 2016 02:24:37 GMT socket.io:client client close with reason transport close
Fri, 06 May 2016 02:24:37 GMT socket.io:socket closing socket - reason transport close

And this is the Nginx log:

2016/05/06 04:24:37 [error] 28383#0: *549 upstream timed out (110: Connection timed out) while reading upstream, client: xxx.xxx.xxx.xxx, server: api.tribeez.net, request: "GET /socket.io/?EIO=3&transport=websocket&t=LI3t1dh HTTP/1.1", upstream: "http://127.0.0.1:3010/socket.io/?EIO=3&transport=websocket&t=LI3t1dh", host: "api.tribeez.net"

And my Nginx conf for this app:

http {
    map $http_upgrade $connection_upgrade {
        default upgrade;
        ''      close;
    }
}

server {
    server_name api.tribeez.net;
    location / {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:3010;
    }
    location /socket.io/ {
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
        proxy_set_header Host $host;
        proxy_pass http://127.0.0.1:3010;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection $connection_upgrade;
    }
}

Any idea why it closes? Could it be that I need to ping it regularly?

Found the answer at the bottom of an Nginx blogpost: I needed to upgrade my Nginx version to a 1.3.13+. I installed the 1.10 (latest stable) using the right Nginx Debian repository (see instructions), which fixed the issue.

Here is my browser output after setting localStorage.debug = '*':

socket.io-client:url parse https://api.tribeez.net +0ms
socket.io-client new io instance for https://api.tribeez.net +5ms
socket.io-client:manager readyState closed +2ms
socket.io-client:manager opening https://api.tribeez.net +1ms
engine.io-client:socket creating transport "polling" +2ms
engine.io-client:polling polling +2ms
engine.io-client:polling-xhr xhr poll +1ms
engine.io-client:polling-xhr xhr open GET: https://api.tribeez.net/socket.io/?EIO=3&transport=polling&t=LI4PaE9 +2ms
engine.io-client:polling-xhr xhr data null +2ms
engine.io-client:socket setting transport polling +1ms
socket.io-client:manager connect attempt will timeout after 20000 +3ms
socket.io-client:manager readyState opening +3ms
engine.io-client:polling polling got data ArrayBuffer +468ms
engine.io-client:socket socket receive: type "open", data "{"sid":"0BCyhfQm--8uOQYUAAAb","upgrades":["websocket"],"pingInterval":25000,"pingTimeout":60000}" +5ms
engine.io-client:socket socket open +1ms
socket.io-client:manager open +0ms
socket.io-client:manager cleanup +1ms
socket.io-client:socket transport is open - connecting +0ms
engine.io-client:socket starting upgrade probes +1ms
engine.io-client:socket probing transport "websocket" +1ms
engine.io-client:socket creating transport "websocket" +0ms
engine.io-client:polling polling +2ms
engine.io-client:polling-xhr xhr poll +0ms
engine.io-client:polling-xhr xhr open GET: https://api.tribeez.net/socket.io/?EIO=3&transport=polling&t=LI4PaLo&sid=0BCyhfQm--8uOQYUAAAb +1ms
engine.io-client:polling-xhr xhr data null +0ms
engine.io-client:polling polling got data ArrayBuffer +252ms
engine.io-client:socket socket receive: type "message", data "0" +1ms
socket.io-parser decoded 0 as {"type":0,"nsp":"/"} +0ms
engine.io-client:polling polling +2ms
engine.io-client:polling-xhr xhr poll +0ms
engine.io-client:polling-xhr xhr open GET: https://api.tribeez.net/socket.io/?EIO=3&transport=polling&t=LI4PaPo&sid=0BCyhfQm--8uOQYUAAAb +0ms
engine.io-client:polling-xhr xhr data null +1ms
engine.io-client:socket probe transport "websocket" opened +441ms
engine.io-client:socket probe transport "websocket" pong +252ms
engine.io-client:socket pausing current transport "polling" +1ms
engine.io-client:polling we are currently polling - waiting to pause +1ms
engine.io-client:polling polling got data ArrayBuffer +98ms
engine.io-client:socket socket receive: type "noop", data "undefined" +1ms
engine.io-client:polling pre-pause polling complete +0ms
engine.io-client:polling paused +1ms
engine.io-client:socket changing transport and sending upgrade packet +0ms
engine.io-client:socket setting transport websocket +0ms
engine.io-client:socket clearing existing transport polling +1ms
engine.io-client:polling ignoring poll - transport state "paused" +0ms

Socket.io seems to be opening a polling connection anyway, but pauses it to prefer the websocket once the latter is working (I suppose...)

来源：https://stackoverflow.com/questions/37063442/websocket-connection-failed-one-or-more-reserved-bits-are-on-reserved1-0-re

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node.js

nginx

websocket

Socket.IO

cloudflare