logProvider Issue: No logging from winston when a call is given

[Spenstar]

Behavior without logProvider override

[HPM] Rewriting path from "/some_path/request" to "/api/request"
[HPM] GET /some_path/api/request ~> http://some_url.com:port

Expected behavior

TIME_LOGGED - info: [HPM] Rewriting path from "/some_path/request" to "/api/request"
TIME_LOGGED - info: [HPM] GET /some_path/api/request ~> http://some_url.com:port

Actual behavior

No output to console

Setup

• http-proxy-middleware: 0.17.4
• server: express 4.14.0
• logger: winston 2.3.1

proxy middleware configuration / Server Mounting

var http_proxy = require('http-proxy-middleware');
var express = require('express');
var router = express.Router();

var requestTime = function (req, res, next) {
  req._startTime = new Date().getTime();
  next();
};

router.use('/some_path', requestTime, proxy('http://some_url.com', '/api'));

function onProxyRequest(path) {
  return function (proxyReq, req) {
    var values = serviceCallerId(req);
    proxyReq.setHeader('User-Agent', values.userAgent);
    proxyReq.setHeader('X-Orig-Base', '/some/api' + path);
    if (!req.headers.accept) {
      proxyReq.setHeader('accept', 'application/json');
    }
    return proxyReq;
  };
}

function proxy(url, path) {
  var pathRewrite = {};
  pathRewrite['^' + path + '/'] = '/';
  var options = {
    logLevel: 'debug',
    logProvider: function (provider) {
      var winston = require('winston');
      return new (winston.Logger)({
        transports: [
          new (winston.transports.Console)(
              {'timestamp':true})
        ]
      });
    },
    target: url,
    changeOrigin: true,
    pathRewrite: pathRewrite,
    onProxyReq: onProxyRequest(path)
  };
  return http_proxy(options);
}

[alexduros]

I faced the same issue.
You have to setup your winston logger instance with the same logLevel that you setup in HPM side.
Actually, for debug logLevel, HPM use logger.debug method and winston default logLevel is info so you have to add logLevel: 'debug' option to your winston instance.

[chimurai]

fixed in 3.0.0-beta

https://github.com/chimurai/http-proxy-middleware/blob/master/recipes/logger.md