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This is my first attempt at http-proxy. I am getting the error:

Error: Must provide a proper URL as target

Code:

httpProxy = require('http-proxy');
httpProxy.createServer(function(req, res) {
  proxy.web(req, res, { target: 'http://127.0.0.1:10002' });
}).listen(3001);
I know from curl my website is running on port 10002. 
What does a properly URL look like? Or is this error actually mean something completely different? Port 10002 is not accessible outside of the box, I am testing this over the Internet.
You need to create the server with the http module, not http-server.
Replace httpProxy.createServer with require('http').createServer :
const httpProxy = require('http-proxy')
const proxy = httpProxy.createProxyServer({}) // I added this line to make this full snippet working
require('http').createServer(function (req, res) {
  proxy.web(req, res, { target: 'http://127.0.0.1:10002' })
}).listen(3001)
        
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