Log an express request if the response has a bad status code.

var errorLog = require('request-error-log-middleware');
var logger = new require('winston').Logger();

var app = express();

app.configure('production', function () {
  app.use(errorLog(logger));
});

Return a request error logger middleware with custom statuses:

{
    404: logger.warn, // warn if its a 404
    '*': logger.error // error if its anything else
}

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