Book Image

Opa Application Development

By : Li Wenbo
Book Image

Opa Application Development

By: Li Wenbo

Overview of this book

Opa is a full-stack Open Source web development framework for JavaScript that lets you write secure and scalable web applications. It generates standard Node.js/MongoDB applications, natively supports HTML5 and CSS and automates many aspects of modern web application programming. It handles all aspects of web programming written in one consistent language and compiled to web standards.Opa Application Development is a practical,hands-on guide that provides you with a number of step-by-step exercises. It covers almost all aspects of developing a web application with Opa, which will help you take advantage of the real power of Opa, as well as building a secure, powerful web application rapidly.Opa Application Development dives into all concepts and components required to build a web application with Opa. The first half of this book shows you all of the basic building blocks that you will need to develop an Opa application, including the syntax of Opa, web development aspects, client and server communication and slicing, plugin, database, and so on. By the end of the book you will have yourself created a complete web application along with a game: Pacman!
Table of Contents (18 chapters)
Opa Application Development
About the Author
About the Reviewers

Dispatching requests

We have gone through the first two cases of Server.handler. They are both simple and accept all requests. But in real web applications, requests and responses are much more complicated, and the web server should respond differently according to different requests. This section we will cover the remaining cases of Server.handler and will show how to handle different types of requests.

The resource handler

A resource handler is often used to serve static resources such as images and sounds. The case {stringmap(resource) resources} performs on a non-decoded URI (Uniform Resource Identifier), and returns a resource that the URI matches with the resource's stringmap. To make it clear, let's suppose there are three images in the directory res: opa1.png, opa2.png, and opa3.png.

If we create the resources stringmap manually, it should look like this:

"res/opa1.png" -> a resource of opa1.png
"res/opa2.png" -> a resource of opa2.png
"res/opa3.png" -> a resource of opa3.png...