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koa1-cors

v1.0.0

Published

CORS middleware for Koa

Downloads

3

Readme

koa-cors

CORS middleware for Koa pinned at koa@1

Inspired by the great node-cors module.

Installation (via npm)

$ npm install koa-cors

Usage

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);

Options

origin

Configures the Access-Control-Allow-Origin CORS header. Expects a string (ex: http://example.com). Set to true to reflect the request origin, as defined by req.header('Origin'). Set to false to disable CORS. Can also be set to a function, which takes the request as the first parameter.

expose

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.

maxAge

Configures the Access-Control-Max-Age CORS header. Set to an integer to pass the header, otherwise it is omitted.

credentials

Configures the Access-Control-Allow-Credentials CORS header. Set to true to pass the header, otherwise it is omitted.

methods

Configures the Access-Control-Allow-Methods CORS header. Expects a comma-delimited string (ex: 'GET,PUT,POST') or an array (ex: ['GET', 'PUT', 'POST']).

headers

Configures the Access-Control-Allow-Headers CORS header. Expects a comma-delimited string (ex: 'Content-Type,Authorization') or an array (ex: ['Content-Type', 'Authorization']). If not specified, defaults to reflecting the headers specified in the request's Access-Control-Request-Headers header.

For details on the effect of each CORS header, read this article on HTML5 Rocks.

License

MIT License