rewriteCookiePath option, to rewrite the "Path" from "Set-Cookie" response headers

README.md

@@ -184,6 +184,11 @@ proxies: [
 ]
 ```
 
+### options.rewriteCookiePath
+Type: `String`
+
+Rewrite the "Path" from "Set-Cookie" response headers, useful when the host server has a different context path than your app.
+
 #### options.timeout
 Type: `Number`
 

lib/utils.js

@@ -69,6 +69,20 @@ utils.matchContext = function(context, url) {
     return matched;
 };
 
+utils.interceptCookiePaths = function(res, rewritePath) {
+    var _setHeader = res.setHeader.bind(res);
+    res.setHeader = function(name, value) {
+        if (name && value && name.toLowerCase() === 'set-cookie') {
+            var fixedCookie = value.toString().replace(/Path=([^;]*)(;|$)/gi, function(match, path, end){
+                return 'Path=' + rewritePath + end;
+            });
+            return _setHeader('Set-Cookie', fixedCookie);
+        } else {
+            return _setHeader(name, value);
+        }
+    };
+};
+
 utils.proxyRequest = function (req, res, next) {
     var proxied = false;
 
@@ -77,6 +91,9 @@ utils.proxyRequest = function (req, res, next) {
             if (proxy.config.rules.length) {
                 proxy.config.rules.forEach(rewrite(req));
             }
+            if(proxy.config.rewriteCookiePath) {
+                utils.interceptCookiePaths(res, proxy.config.rewriteCookiePath);
+            }
             proxy.server.proxyRequest(req, res);
             // proxying twice would cause the writing to a response header that is already sent. Bad config!
             proxied = true;

tasks/connect_proxy.js

@@ -45,7 +45,8 @@ module.exports = function(grunt) {
             changeOrigin: false,
             xforward: false,
             rejectUnauthorized: false,
-            rules: []
+            rules: [],
+            rewriteCookiePath: null
         });
         if (validateProxyConfig(proxyOption)) {
             proxyOption.rules = utils.processRewrites(proxyOption.rewrite);