POST request body is not proxied to the servers

I have in my backend defined:

var proxy = proxyMiddleware('/api', {
        target: 'http://somehost.zero',
        proxyTable: {
            '/api/one': 'http://somehost.one',
            '/api/two': 'http://somehost.two',
        }
    });
app.use(proxy);

and when I’m proxing POST request (lets say to the ‘/api/one’: ‘http://somehost.one’ ) I don’t know why but server http://somehost.one get request without body.

Did you had similar problem?

[chimurai]

Did a little test and I am able to receive POST data at the target server.

I noticed you are using the body-parser middleware: https://github.com/dejewi/proxy-bug/blob/master/app.js#L16

You might want to change to order of the middlwares you are using. Try moving the http-proxy-middleware above the body-parser

source: http://stackoverflow.com/a/25651651/3841188

Hope this solves the issue.

[chimurai]

If you can’t change the order of the middleware; You can restream the parsed body before proxying the request. This should fix the POST request:

// restream parsed body before proxying
var restream = 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);
    }
}

var apiProxy = proxyMiddleware('/api', {
    target: 'https://xxx.xxx.xxx.xxx',
    onProxyReq: restream
});


var app = express();

app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(apiProxy);                // with restreaming

source: node-http-proxy/examples/middleware/bodyDecoder-middleware.js. (https://github.com/nodejitsu/node-http-proxy/pull/1027)