• factory function
• middleware
• http server

• what’s harp
• how to use it

• Meet the Connect Framework
• how to use connect to add a middleware

• Transfer-Encoding: chunked
• HTTP 303 status && Location Header
  • wiki link
  • in server-static: to modify pathname and redirect to it.

–save: Package will appear in your dependencies.

–save-dev: Package will appear in your devDependencies.

• npm install document

• !== vs ||

/* version !==:
  only b = flase then  a = flase, else a = true, so defalut is true;
  and the most important you only have choice of true or flase;
  it is very useful if you are setting a boolean value in options.
*/
var a = false !== b;
var a = true !== b; //defalut is false;
/* version ||
 flase:  b = undefined or 0 or null or false then a = flase  else a = b , defalut is false,
 this mothod can not solve defalut is true.
*/
var a = b || false;
var a = b || true; //are you kidding?

• support GET , HEAD
• require ‘url’
  • url.parse to get a url object?
  • and then you can use Object.pathname
  • url.format
• require ‘send’
• next, next()
  • next(err)
• exports.mime
  • provide MIME type : to deal with non ASIC2 docutment.
• escape()
  • to replace some words to other words…

1. fs.readFile里面的 data 无法传出去? **！回调会在你后面赋值之后才执行啊！
2. 不指名statuscode的话是如何返回状态码的?

• how it run?
• why not use it ?

• wiki
• mime type