Recieving Cannot POST response #667

Garyfatt · 2021-09-12T21:02:18Z

Garyfatt
Sep 12, 2021

I am attempting to use the Modify POST - https://github.com/chimurai/http-proxy-middleware/blob/master/recipes/modify-post.md
I want to recieve a http POST and read from its json body AND then change the headers & json body & then send it an api.

I am receiving the response below when sending a http post with JSON body to port 8080

<!DOCTYPE html>
<html lang="en">

<head>
	<meta charset="utf-8">
	<title>Error</title>
</head>

<body>
	<pre>Cannot POST /</pre>
</body>

</html>

Here is my code:

'use strict';
console.log("hello")
const express = require('express');
const { createProxyMiddleware } = require('http-proxy-middleware');
// const router = express.Router();

const app = express();

var http = require('http')

const proxy_filter = function (path, req) {
  return path.match('^/docs') && (req.method === 'GET' || req.method === 'POST');
};

const proxy_options = {
  target: '<API_link>',
  pathRewrite: {
    '^/docs': '/java/rep/server1', // Host path & target path conversion
  },
  onError(err, req, res) {
    res.writeHead(500, {
      'Content-Type': 'text/plain',
    });
    res.end('Something went wrong. And we are reporting a custom error message.' + err);
  },
  onProxyReq(proxyReq, req, res) {
    if (req.method == 'POST' && req.body) {
      // Add req.body logic here if needed....
      let owner = req.body.owner
      let actor = req.body.actor
      let status= req.body.status
      // ....

      // Remove body-parser body object from the request
      if (req.body) delete req.body;

      // Make any needed POST parameter changes
      let body = new Object();

      body.var1 = "test";
      body.var2 = var2;
      body.var3 =  var3 + " is a variable

      // URI encode JSON object
      body = Object.keys(body)
        .map(function (key) {
          return encodeURIComponent(key) + '=' + encodeURIComponent(body[key]);
        })
        .join('&');

      // Update header
      proxyReq.setHeader('Header1', 'Head');
      proxyReq.setHeader('Header2', 'Head2');

      // Write out body changes to the proxyReq stream
      proxyReq.write(body);
      proxyReq.end();
    }
  },
};

// Proxy configuration
const proxy = createProxyMiddleware(proxy_filter, proxy_options);

/* GET home page. */
// router.get('/', function (req, res, next) {
//   res.render('index', { title: 'Node.js Express Proxy Test' });
// });

// router.all('/docs', proxy);

// module.exports = router;

app.all('/docs', proxy);
app.listen(8080, () => {
  console.log(`listening on port 8080`)
});

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Recieving Cannot POST response #667

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Recieving Cannot POST response #667

Garyfatt Sep 12, 2021

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Garyfatt
Sep 12, 2021