我也遇到过类似的问题，通过将代理代码移到其他节点中间件上解决了这个问题。
例如：

var httpProxy = require('http-proxy');
var apiProxy = httpProxy.createProxyServer();
app.use("/someroute", function(req, res) {
    apiProxy.web(req, res, { target: 'http://someurl.com'})
});
app.use(someMiddleware);

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不是这个：

app.use(someMiddleware);
var httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer();
app.use("/someroute", function(req, res) {
    proxy.web(req, res, { target: 'http://someurl.com'})
});

型
我的具体问题是在代理之上有BodyParser中间件。我没有做太多的挖掘，但它一定以某种方式修改了请求，当请求最终到达它时，它破坏了代理库。

为了完整起见，模块body-parser和http-proxy之间确实存在集成问题，如this线程中所述。
如果你不能改变中间件的顺序，你可以在拒绝请求之前restream解析的主体。

// restream parsed body before proxying
proxy.on('proxyReq', function(proxyReq, req, res, options) {
    if (req.body) {
        let bodyData = JSON.stringify(req.body);
        // incase if content-type is application/x-www-form-urlencoded -> we need to change to application/json
        proxyReq.setHeader('Content-Type','application/json');
        proxyReq.setHeader('Content-Length', Buffer.byteLength(bodyData));
        // stream the content
        proxyReq.write(bodyData);
    }
}

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我在这个问题上花了2天时间。希望它能帮上忙！

需要捕捉代理的错误：

var httpProxy = require('http-proxy');
var proxy = httpProxy.createProxyServer({ target: argv.proxy_url })
proxy.on('error', function(err, req, res) {
    res.end();
})

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在浪费了一天多的时间，并遵循了nodejitsu/node-http-proxy issues中的一些帖子之后，我能够让它工作，这要感谢riccardo.cardin。我决定发布完整的示例来保存你的时间。下面的示例使用服务器express，body-parser（请求。主体中间件），当然还有http-proxy来代理和转发请求到第三方服务器。

const webapitargetUrl = 'https://posttestserver.com/post.php'; 
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json()); // support json encoded bodies
var https = require('https');
  var stamproxy = httpProxy.createProxyServer({
      target: 'https://localhost:8888',
      changeOrigin: true,
      agent  : https.globalAgent, 
      toProxy : true,
      secure: false,
      headers: {
      'Content-Type': 'application/json'
      } 
    });
  stamproxy.on('proxyReq', function(proxyReq, req, res, options) {
      console.log("proxying for",req.url);
      if (req.body) {
        console.log("prxyReq req.body: ",req.body);
        // modify the request. Here i just by removed ip field from the request you can alter body as you want
        delete req.body.ip;
        let bodyData = JSON.stringify(req.body);
        // in case if content-type is application/x-www-form-urlencoded -> we need to change to application/json
        proxyReq.setHeader('Content-Type','application/json');
        proxyReq.setHeader('Content-Length', Buffer.byteLength(bodyData));
        // stream the content
        console.log("prxyReq bodyData: ",bodyData);
        proxyReq.write(bodyData);
      }
      console.log('proxy request forwarded succesfully');
  });
  stamproxy.on('proxyRes', function(proxyRes, req, res){    
    proxyRes.on('data' , function(dataBuffer){
        var data = dataBuffer.toString('utf8');
        console.log("This is the data from target server : "+ data);
    }); 
  });
app.use(compression());
app.use(favicon(path.join(__dirname, '..', 'static', 'favicon.ico')));
app.use(Express.static(path.join(__dirname, '..', 'static')));
var sessions = require("client-sessions");
app.use(sessions({
  secret: 'blargadeeblargblarg',
  cookieName: 'mysession'
}));
app.use('/server/setserverip', (req, res) => {
    console.log('------------ Server.js /server/setserverip  ---------------------------------');
    req.mysession.serverip += 1;
    console.log('session data:');
    console.log(req.mysession.serverip)
    console.log('req.body:');
    console.log(req.body);
    // Proxy forwarding   
    stamproxy.web(req, res, {target: webapitargetUrl});
    console.log('After calling proxy serverip');
});

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http-proxy似乎与body-parser中间件不兼容。您可能希望将http-proxy中间件移到body-parser之前或停止使用body-parser。
标签：Socket hangup while posting request to Node-http-proxy Node.js

我在 post，put 和 delete 时遇到了这个问题，但在从chimurai / http-proxy-middleware读取this issue后，我已经做到了。

1-添加onProxyReq：https://github.com/chimurai/http-proxy-middleware/issues/40#issuecomment-249430255
2-需要注意的是，在请求头中需要添加Content-Type：application/json
**3-**没有body解析器的更改顺序

http-proxy-middleware是一个使用http-proxy的类似软件包，它是专门为以下目标创建的：
轻松配置代理中间件，用于连接、快速、浏览器同步等。
这个包继承了body解析器的相同问题，但是，修复（fixRequestBody）包含在包中。这里是文档中的一个例子。

const { createProxyMiddleware, fixRequestBody } = require('http-proxy-middleware');
const proxy = createProxyMiddleware({
  /**
    * Fix bodyParser
  **/
 onProxyReq: fixRequestBody,
});

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对于Post请求，此错误可能是由bodyParser消耗的stream引起的。您需要重新创建流并将其传递给代理。

app.use(bodyParser.json({
  // verify function has access to buff that contains the stream
  // create a new readable stream and save it to streamBody
  verify: (req, res, buf, encoding) => {
  const readableStream = Readable.from(buf);
  req.streamBody = readableStream
 }
}));
 // Your stream was already consumed by bodyParser you must pass it 
 // again to the param "buffer"
proxy.web(req, res, {
 target: "target-here",
 buffer: req.streamBody
});

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