depends on the API

// create and setup filters
this.fs = sinon.fakeServer.create();

this.fs.xhr.useFilters = true;
this.fs.xhr.addFilter(
  function(method, url, async, username, password) {
    return !(new RegExp(this.urlRoot)).test(url);
});

// configure model list resource
this.fs.respondWith("GET", this.urlRoot + '/todo',
  [200, { "Content-Type": "application/json" },
    JSON.stringify(inMemoryData) ]);

// configure single model item resource
this.fs.respondWith("POST", this.urlRoot + '/todo',
  function (xhr) {
    var todo,
      obj = JSON.parse(xhr.requestBody);
    if (obj.order === null) { // new object
      delete obj.order;
      inMemoryData.push(obj);
    } else if (obj.oldTitle) { // "title" attribute changed
      todo = _.find(inMemoryData, function(item){
        return item.title == obj.oldTitle; });
      todo.title = obj.title;
    } else { // "completed" attribute changed
      todo = _.find(inMemoryData, function(item){
        return item.title == obj.title; });
      todo.completed = obj.completed;
    }
    console.log(inMemoryData);
    xhr.respond(200, { "Content-Type": "application/json" });
  });

// define standard BB models and collections
var Book = Backbone.Model.extend({
    defaults: {
        title: "Unknown title",
        author: "Unknown author"
    }
});
var Books = Backbone.Collection.extend({
    model: Book,
    url: "library-app/books"
});

fauxServer.addRoute("createBook", "library-app/books", "POST",
  function (context) {
    // Every handler receives a 'context' parameter.
    // Use context.data (a hash of Book attributes)
    // to create the Book entry in your persistence layer:
    context.data.id = newId(); // assign an id to the new book
    books.push(context.data);  // save to persistence layer
    return context.data;
});

fauxServer.addRoutes({
    createBook: {
        urlExp: "library-app/books",
        httpMethod: "POST",
        handler: function (context) {
            // Create book using context.data
            // Save to persistence layer
            // Return attributes of newly created book
        }
    },
    readBook: {
        urlExp: "library-app/books/:id",
        httpMethod: "GET",
        handler: function (context, bookId) {
          // Return attributes of book with id 'bookId'
        }
    },
    // ...

    //...
    updateBook: {
        urlExp: "library-app/books/:id",
        httpMethod: "PUT",
        handler: function (context, bookId) {
          // Update stored book with id 'bookId'
          // using attributes in context.data
          // Return updated attributes
        }
    },
    deleteBook: {
        urlExp: "library-app/books/:id",
        httpMethod: "DELETE",
        handler: function (context, bookId) {
          // Delete stored book of id 'bookId'
        }
    }
}