/node_modules/http-proxy/lib/http-proxy/index.js:120;错误：套接字挂起

Question

我正在尝试在 docker-compose 中运行的容器之一中运行expressJS；当我不断按 CMD+R 刷新登陆页面时（大概 3~4 秒），它显示“错误：套接字挂起”并损坏。 这是错误

saml-enabled-reverse-proxy_1  | /node_modules/http-proxy/lib/http-proxy/index.js:120
saml-enabled-reverse-proxy_1  |     throw err;
saml-enabled-reverse-proxy_1  |     ^
saml-enabled-reverse-proxy_1  | 
saml-enabled-reverse-proxy_1  | Error: socket hang up
saml-enabled-reverse-proxy_1  |     at connResetException (internal/errors.js:561:14)
saml-enabled-reverse-proxy_1  |     at Socket.socketCloseListener (_http_client.js:380:25)
saml-enabled-reverse-proxy_1  |     at Socket.emit (events.js:214:15)
saml-enabled-reverse-proxy_1  |     at TCP.<anonymous> (net.js:658:12) {
saml-enabled-reverse-proxy_1  |   code: 'ECONNRESET'
saml-enabled-reverse-proxy_1  | }

我已经花了30多个小时在这上面，但仍然没有任何线索可能有什么问题......？？？

这是源代码

var express = require("express");
var session = require('express-session');
var cookieParser = require('cookie-parser');
var httpProxy = require('http-proxy');
var fs = require('fs');
var saml = require('passport-saml');
var passport = require('passport');

// ServiceProvider will be the load balancer.
let serviceProvider = 'http://opengrok_docker:8080';
let entryPoint = null;
let hackMode = false;
if (process.env.MODE=='TEST') {
  entryPoint = 'http://localhost:8080/x'
} else if (process.env.MODE=='STAGE') {
  entryPoint = 'xxx'
} else if (process.env.MODE=='PROD') {
  entryPoint = 'xxx'
}

// SAML config options here
var samlStrategy = new saml.Strategy({
    entryPoint: entryPoint,
    issuer: 'urn:opengrok',
    identifierFormat: null,
    decryptionPvk: privateKey, //.key version
    validateInResponseTo: false,
    disableRequestedAuthnContext: false,
}, function(profile, done) {
    return done(null, profile);
});

// Passport Middleware Block
passport.serializeUser(function(user, done) {
    done(null, user);
});

passport.deserializeUser(function(user, done) {
    done(null, user);
});
passport.use('samlStrategy', samlStrategy);

let app = express();
let apiProxy = httpProxy.createProxyServer();
app.get('/', <<<<<----- REFRESHING THIS PAGE over seconds got me error;
    function(req, res) {
        apiProxy.web(req, res, {target: serviceProvider});
    }
);

app.use(session({secret: 'secret', resave: false, saveUninitialized: true}));
app.use(passport.initialize());
app.use(passport.session());
// Static blocks
app.use('/img', express.static(__dirname + '/img'));
app.use('/fonts', express.static(__dirname + '/fonts'));
app.use('/js', express.static(__dirname + '/js'));
app.use('/css', express.static(__dirname + '/css'));
app.use('/font-awesome', express.static(__dirname + '/font-awesome'));
app.use('/source/default/img', express.static(__dirname + '/source/default/img'));
app.use('/source/default', express.static(__dirname + '/source/default'));
app.use('/source/js', express.static(__dirname + '/source/js'));
app.use('/source/api/v1/suggest/config', express.static(__dirname + '/source/config'))

// Serve the app on port 443
var server = app.listen(443, function () {
    console.log('Listening on port %d', server.address().port)
});

Dockerfilie

FROM node:12.10.0

COPY package.json .

RUN npm install

COPY . .
CMD [ "node", "--max-old-space-size=8192", "--trace_gc", "src/index.js" ]

package.json

{
  "name": "aop-sp",
  "version": "1.0.0",
  "description": "Art of Possible Service Provider",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": "xxx",
  "license": "ISC",
  "dependencies": {
    "body-parser": "^1.19.0",
    "connect-ensure-login": "^0.1.1",
    "cookie-parser": "^1.4.4",
    "express": "^4.17.1",
    "express-session": "^1.16.2",
    "http-proxy": "^1.0.0",
    "passport": "^0.4.0",
    "passport-saml": "^1.1.0"
  },
  "devDependencies": {
    "http-proxy-middleware": "^0.20.0"
  }
}

Answer 1

我在您的代码中看到的一个问题是，对

/

的请求将被代理，但整个中间件链仍将针对该请求执行。这可能不是您想要的，并且可能是在代理请求完成处理之前结束 tcp 连接的原因。

我建议在使用express时使用

http-proxy-middleware

而不是

http-proxy

，因为它可以轻松集成为express中间件：

 const {createProxyMiddleware} = require('http-proxy-middleware');
 ...
 app.get('/', createProxyMiddleware({ target: serviceProvider}));
 ...

Answer 2

a biblioteca httpProxy.createProxyServer({}) tem uma função chamada '.on' onde vc pode pegar o erro e tratar o erro, exemplo :

APIProxy.web(req, res, { target: url , ignorePath: true});

APIProxy.on('error', (err, req, res) => {
  if (err.code === 'ECONNRESET' || err.code === 'ECONNREFUSED') {
    console.error('Erro no proxy: Conexão perdida ou recusada pelo servidor de destino.');
   
  } else {
    console.error('Erro no proxy:', err);
    
  }
});