npm install koa-corskoa-cors
========
CORS middleware for Koa
Inspired by the great node-cors module.
``bash`
$ npm install koa-cors
`javascript
var koa = require('koa');
var route = require('koa-route');
var cors = require('koa-cors');
var app = koa();
app.use(cors());
app.use(route.get('/', function() {
this.body = { msg: 'Hello World!' };
}));
app.listen(3000);
`
Configures the Access-Control-Allow-Origin CORS header. Expects a string
(ex: http://example.com). Set to true to reflect thereq.header('Origin')
request origin, as defined
by . Set to false to disable CORS. Can also be set to a
function, which takes the request as the first parameter.
Configures the Access-Control-Expose-Headers CORS header. Expects a
comma-delimited string (ex: 'WWW-Authenticate,Server-Authorization') or an array
(ex: ['WWW-Authenticate', 'Server-Authorization]). Set this to pass the
header, otherwise it is omitted.
Configures the Access-Control-Max-Age CORS header. Set to an integer to pass
the header, otherwise it is omitted.
Configures the Access-Control-Allow-Credentials CORS header. Set to true
to pass the header, otherwise it is omitted.
Configures the Access-Control-Allow-Methods CORS header. Expects a
comma-delimited string (ex: 'GET,PUT,POST') or an array (ex: ['GET', 'PUT',
'POST']).
For details on the effect of each CORS header,
read this article on HTML5 Rocks.