115 lines
2.6 KiB
Markdown
115 lines
2.6 KiB
Markdown
|
|
|
|
|
|
[](https://travis-ci.org/koajs/koa)
|
|
|
|
Expressive middleware for node.js using generators via [co](https://github.com/visionmedia/co)
|
|
to make writing web applications and REST APIs more enjoyable to write.
|
|
|
|
Only methods that are common to nearly all HTTP servers are integrated directly into Koa's small ~400 SLOC codebase. This
|
|
includes things like content-negotiation, normalization of node inconsistencies, redirection, and a few others.
|
|
|
|
No middleware are bundled with koa. If you prefer to only define a single dependency for common middleware, much like Connect, you may use
|
|
[koa-common](https://github.com/koajs/common).
|
|
|
|
## Installation
|
|
|
|
```
|
|
$ npm install koa
|
|
```
|
|
|
|
To use Koa you must be running __node 0.11.4__ or higher for generator support, and must run node(1)
|
|
with the `--harmony-generators` flag. If you don't like typing this, add an alias to your shell profile:
|
|
|
|
```
|
|
alias node='node --harmony-generators'
|
|
```
|
|
|
|
## Community
|
|
|
|
- [API](docs/api.md) documentation
|
|
- [Middleware](https://github.com/koajs/koa/wiki/Koa) list
|
|
- [Wiki](https://github.com/koajs/koa/wiki)
|
|
- [G+ Community](https://plus.google.com/communities/101845768320796750641)
|
|
- [Mailing list](https://groups.google.com/forum/#!forum/koajs)
|
|
- [Guide](docs/guide.md)
|
|
- [FAQ](docs/faq.md)
|
|
- __#koajs__ on freenode
|
|
|
|
## Example
|
|
|
|
```js
|
|
var koa = require('koa');
|
|
var app = koa();
|
|
|
|
// logger
|
|
|
|
app.use(function *(next){
|
|
var start = new Date;
|
|
yield next;
|
|
var ms = new Date - start;
|
|
console.log('%s %s - %s', this.method, this.url, ms);
|
|
});
|
|
|
|
// response
|
|
|
|
app.use(function *(){
|
|
this.body = 'Hello World';
|
|
});
|
|
|
|
app.listen(3000);
|
|
```
|
|
|
|
## Running tests
|
|
|
|
```
|
|
$ make test
|
|
```
|
|
|
|
## Benchmarks
|
|
|
|
Average latency with one middleware:
|
|
|
|
0.628ms
|
|
|
|
Average latency with __400__ noop middleware:
|
|
|
|
1.5ms
|
|
|
|
If you like silly benchmarks, here's the requests per second:
|
|
|
|
```
|
|
1 middleware
|
|
8083.45
|
|
|
|
5 middleware
|
|
7449.95
|
|
|
|
10 middleware
|
|
7166.66
|
|
|
|
15 middleware
|
|
6992.18
|
|
|
|
20 middleware
|
|
6650.28
|
|
|
|
30 middleware
|
|
6113.57
|
|
|
|
50 middleware
|
|
5117.46
|
|
```
|
|
|
|
With __50__ middleware (likely much more than you'll need), that's __307,020__ requests per minute, and __18,421,200__ per hour, __442 million__ per day, so unless you're a facebook and can't manage to spin up more
|
|
than one process to scale horizontally you'll be fine ;)
|
|
|
|
## Authors
|
|
|
|
- [TJ Holowaychuk](https://github.com/visionmedia)
|
|
- [Jonathan Ong](https://github.com/jonathanong)
|
|
- [Julian Gruber](https://github.com/juliangruber)
|
|
|
|
# License
|
|
|
|
MIT
|