Failed error during websocket handshake unexpected response code 502

Error during WebSocket handshake: Unexpected response code: 502 using NodeJS and Express #3612

I am using Socket IO (versions mention below) and facing a handshake issue as shown in the below screenshot. Earlier I was getting CORS error and resolved it by adding transports: [‘websocket’]
on the client-side and suddenly this issue got pop up.

Versions I am using:

On Client Side:

On Server Side:

The text was updated successfully, but these errors were encountered:

Try on Back-end:
`const express = require(‘express’);
const app = express();
const portSocketIO = process.env.PORT ||5000;
const server = require(‘http’).createServer(app).listen(portSocketIO);

Try on Front-end:

const socket = socketIOClient(endpoint, < query: < socketId: personId >>); socket.on(‘connect’, () => console.log(«I’m logged»));

Depending on your setup not all transport protocols will run properly.
In your case your client specify websocket only with the following line
transports: [‘websocket’]

You can either remove that line or specify both websocket with polling the following way
transports: [‘websocket’, ‘polling’]

They will have the same effect as socket.io estabilishes a long polling connection first then tries to ubpgrade to websocket tries websockets, but the latter will throw the exception (but still works).
In my experience if you know websocket won’t be available just use long polling only
transports’: [‘polling’]

This happens for example when you’re behing a webview or if your server proxy configurations aren’t setup properly or if you don’t have access to those.

Closed due to inactivity, please reopen if needed.

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Источник

Nginx — ошибка во время рукопожатия WebSocket: неожиданный код ответа: 502

Я запускаю сервер websocket на своей капле Digital Ocean, используя pm2. Кроме того, я использую библиотеку websocket / ws websocket.

Он прослушивает порт 3030.

Используя команду, netstat -l -p я могу увидеть, что он действительно слушает.

Ниже приведена настройка моего файла конфигурации с поддержкой сайтов nginx. Я запускаю статические файлы по / URL-адресу и использую /socket URL-адрес. И / path / to / blah изменен по соображениям безопасности.

При подключении к веб-сокету с помощью wss://www.xxxx.com/socket . Я получаю такую ​​ошибку:

Error during WebSocket handshake: Unexpected response code: 502

Глядя на файл журнала для Nginx, расположенный по адресу /var/log/nginx . Это ошибка, которую я вижу.

[error] 31009#31009: *19 upstream prematurely closed connection while reading response header from upstream, client: X.X.XX.XXX, server: xxxxx.com, request: «GET /socket HTTP/1.1», upstream: «http://127.0.0.1:3030/socket», host: «www.xxxxx.com»

При проверке заголовка для этого веб-сокета. Вот что у меня получилось.

Источник

User267652828 posted

When trying to establish a web socket connection using SignalR I get an unexpected response error 502.

IE 10 reports: ‘WebSocket Error: Incorrect HTTP response. Status code 502, Bad Gateway’

Chrome reports: ‘WebSocket connection to ‘wss://domain/root/signalr/connect?transport=webSockets&client….’ failed: Error during WebSocket handshake: Unexpected response code: 502′

….and after this SignalR then falls back to another transport — so everything still works, but i really want to get this working using web sockets.

When I connect directly to the server, everything works as it should.

I have setup a test system, that has only a single server behind a single ARR load balancer, I have tried every suggestion that I can find but I still cant find a solution — or for that matter anyone indicating that they have successfully configured this
even though Microsoft claim it is support «with no extra config».

Can anyone confirm it even works — or even that it does not work ?

I asked on stackoverflow but so far haven’t had even a single response after a week — I really like ARR & URL Rewrite, I have used it for quite a few years now with millions of requests a day going through it, but with the lack of any documentation or
assistance for ARR in general I am having to seriously consider finding another solution ….

https://stackoverflow.com/questions/44092063/signalr-websocket-fails-with-unexpected-response-code-502-iis-8-5-arr-3-0

If anyone can actually help me get this working I will take the time to write some documentation on how to make it work — step by step, with all the source code for a test SignalR app, all the configuration for IIS, ARR, UrlRewrite — and post it all
on github, microsoft docs or somewhere that others can find !

870 votes

1 answers

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    map $http_upgrade $connection_upgrade {
        default Upgrade;
        '' close;
    }

    upstream socket{
        server localhost:8081;
        #server connect.mydomain.net:8081;
    } 

    location /ws/ {
            #proxy_pass "http://socket";
            proxy_pass "https://connect.mydomain.net:8081";
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection $connection_upgrade;
            proxy_set_header Host $host;
            proxy_redirect off;
            proxy_send_timeout 86400s;
            keepalive_timeout 86400s;
            proxy_buffers 8 32k;
            proxy_buffer_size 64k;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header X-Forwarded-Proto https;
            reset_timedout_connection on;
        }

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Answer

Solution:

In my case the issue was SELinux not allowing outbound connections

Running the following fixed my issue…

setsebool -P httpd_can_network_connect 1

Seems like an obvious thing that all docs an similar issues on her seem to omit

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