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enable CORS #30

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enable CORS #30

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cfe8cb5
enable CORS
Oct 3, 2016
88bb02b
enable CORS
Oct 27, 2016
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20 changes: 16 additions & 4 deletions lib/proxy.js
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Original file line number Diff line number Diff line change
Expand Up @@ -10,7 +10,7 @@ var routers = {},
config,
useGateway;

exports.initialize = function initialize(options){
exports.initialize = function initialize(options) {
logger = options.logger || require('./logger');
config = configParser(options).proxy;
useGateway = (config.gateway !== null && typeof(config.gateway) === 'object' && typeof(config.gateway.host) === 'string');
Expand Down Expand Up @@ -105,6 +105,18 @@ function createRouter(target) {

router = httpProxy.createProxyServer(options);

router.on('proxyRes', function(proxyRes, req, res) {
// valid CORS request *always* contains an Origin header
// in some cases it's present also for same-origin requests
// but it's sufficient to set CORS response headers for all such requests
if (req.headers.origin) {
res.setHeader('Access-Control-Allow-Origin', req.headers.origin);
// TODO provide option to allow custom request headers (like SOAPAction, for example)
res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
res.setHeader('Access-Control-Allow-Methods', 'HEAD,OPTIONS,GET,POST,PUT,DELETE');
}
});

routers[key] = router;
}

Expand All @@ -124,7 +136,7 @@ function injectAuthHeader(req) {

// inject any custom header values into a proxy request
// along with the x-forwarded-for, x-forwarded-port, and via headers
function injectProxyHeaders(req, rule){
function injectProxyHeaders(req, rule) {
// the HTTP host header is often needed by the target webserver config
req.headers['host'] = rule.target.host + (rule.target.originalPort ? util.format(':%d', rule.target.originalPort) : '');
// document that this request was proxied
Expand All @@ -135,11 +147,11 @@ function injectProxyHeaders(req, rule){
var value = header.value,
name = header.name;

if(typeof(value) === 'function') {
if (typeof(value) === 'function') {
value = value.call(undefined, req);
}

if(typeof(value) !== 'string') {
if (typeof(value) !== 'string') {
value = '';
}

Expand Down