Angularjs ui-router in html5 enabled mode not working

Angularjs version 1.3.14, ui-router version 0.2.15, html5mode enabled. When I try http://localhost/firsttime it redirects to http://localhost as fallback

Here is app.js

'use strict';

// Declare app level module which depends on views, and components
angular.module('tt', [
  'ngRoute',
  'tt.home',
  'tt.firsttime',
  'ui.router'
])

.config(['$routeProvider', '$locationProvider', function($routeProvider, $locationProvider) {
    // Routes
    $routeProvider.otherwise({
        redirectTo: '/'
    });

    // set HTML5 history API
    $locationProvider.html5Mode(true);
}]);

Here is firsttime.js

// create our angular app and inject ngAnimate and ui-router 
// =============================================================================
angular.module('tt.firsttime', ['ui.router'])

// configuring our routes 
// =============================================================================
.config(['$stateProvider', '$urlRouterProvider', '$routeProvider', function($stateProvider, $urlRouterProvider, $routeProvider) {
    // catch all route
    // send users to the form page 
    $urlRouterProvider.otherwise('/firsttime');

    $stateProvider
        // route to show our basic form (/firsttime)
        .state('firsttime', {
            url: '/firsttime',
            templateUrl: 'firsttime/form.html',
            //controller: 'formController'
        })
}])

// our controller for the form
// =============================================================================
.controller('formController', ['$scope', function($scope) {
    console.log('FORM controller');
}]);

And here is form.html

<div class="row">
<div class="col-sm-8 col-sm-offset-2">

  <div id="form-container">

      <div class="page-header text-center">
          <h2>Let's Be Friends</h2>

          <!-- the links to our nested states using relative paths -->
          <!-- add the active class if the state matches our ui-sref -->
          <div id="status-buttons" class="text-center">
              <a ui-sref-active="active" ui-sref="firsttime.profile"><span>1</span> Profile</a>
              <a ui-sref-active="active" ui-sref="firsttime.interests"><span>2</span> Interests</a>
              <a ui-sref-active="active" ui-sref="firsttime.payment"><span>3</span> Payment</a>
          </div>
      </div>

      <!-- use ng-submit to catch the form submission and use our Angular function -->
      <form id="signup-form" ng-submit="processForm()">
          <!-- our nested state views will be injected here -->
          <div id="form-views" ui-view></div>
      </form>

  </div>



</div>
</div>

Update Here is the nginx routing block

    location / {
        root   html/app;
        index  index.html;
        try_files $uri /index.html;
    }