node.js - Getting 404 with AngularJS and mongoose -

i getting 404 response after sending following request. have tried different api names still getting same error.

backend: node+express+mongoose frontend: angularjs

frontend code (angularjs)

$http.post('http://0.0.0.0:8000/users/supervisors', function(response) {     console.log(response); }); 

backend code (mongoose+mongodb)

// express import var express = require('express');  // mongoose import var mongoose = require('mongoose');  // mongoose connection mongodb (database: dummydatabase readonly) mongoose.connect('mongodb://0.0.0.0/dummydatabase', function (error) {     if (error) {         console.log(error);     } });  // mongoose schema definition var schema = mongoose.schema; var userschema = new schema({     name: string,     location: string,     parentid: number });  // mongoose model definition var user = mongoose.model('users', userschema);  // bootstrap express var app = express();  // add headers app.use(function (req, res, next) {      // website wish allow connect     res.setheader('access-control-allow-origin', '*');      // request methods wish allow     res.setheader('access-control-allow-methods', 'get, post, options, put, delete');      // request headers wish allow     res.setheader('access-control-allow-headers', 'x-requested-with,content-type');      // set true if need website include cookies in requests sent     // api (e.g. in case use sessions)     res.setheader('access-control-allow-credentials', true);      // pass next layer of middleware     next(); });  app.get('/users/supervisors', function (req, res, next) {     user.find({}, function (err, docs) {         res.send(docs);     }); });