Make sure your express application responds correctly when outgoing http requests are failing
When your express application is calling failing resources, mount this middleware to ensure it will respond with a proper 502 Bad Gateway response when needed.
$ npm install anubis --saveThis is a tiny express app that will do nothing but proxy another resource. In case the call fails with a 5xx error, anubis makes sure the correct 502 status code is returned.
var express = require('express');
var rp = require('request-promise');
var anubis = require('anubis');
var app = express();
app.get('/', function(req, res, next){
rp('http://my-unreliable-api.com')
.then(function(payload){
res.json({ok: true, payload: payload});
})
.catch(next);
});
// always make sure to mount anubis **after** all routes that call
// external resources
// pass a function that transforms the Error into a status code
app.use(anubis(function(err){
return err.statusCode;
}));
app.use(function(err, req, res, next){ //eslint-disable-line no-unused-vars
res.status(err.status);
res.json({ok: false});
});MIT © Frederik Ring