diff --git a/package.json b/package.json
index 49c96e7..f07f3aa 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "build": "webpack --mode production && yarn templates",
     "build-prod": "yarn build && node bin/update-config.js && mkdir -p build/ && cp -R config.json index.html favicon.ico lib style dist img fonts misc build/ && ./debug-build.sh",
     "build-watch": "webpack --watch --mode development",
-    "dev-server": "yarn templates && webpack-dev-server -d --http --port 28443",
+    "dev-server": "yarn templates && webpack-dev-server -d --https --port 28443",
     "start": "yarn dev-server",
     "test": "yarn jest && yarn tslint && yarn test:bundle",
     "test:ci": "yarn coverage && yarn coveralls",
diff --git a/src/service.ts b/src/service.ts
index c6ef7ac..b5d82e6 100644
--- a/src/service.ts
+++ b/src/service.ts
@@ -321,15 +321,21 @@ export class Service {
   }
 
   static async sendJson(method: string, url: string, json: object): Promise<any> {
+    const savedCookiesJson = window.localStorage.getItem('fiddle-cookies');
+    const cookies = savedCookiesJson ? JSON.parse(savedCookiesJson) : {};
+    const headers = new Headers({ "Content-Type": "application/json; charset=utf-8", ...cookies });
     const response = await fetch(url, {
-      credentials: "include",
       method: method,
       body: JSON.stringify(json),
-      headers: new Headers({ "Content-type": "application/json; charset=utf-8" })
+      headers
     });
     if (!response.ok) {
       throw new Error(`${response.status}: ${await response.text()}`);
     }
+    const setCookies = response.headers.get('Set-Cookie');
+    if (setCookies) {
+      window.localStorage.setItem('fiddle-cookies', JSON.stringify(setCookies));
+    }
     if (response.status === 204) {
       // No Content
       return null;
@@ -348,7 +354,7 @@ export class Service {
   static async getJson(url: string): Promise<any> {
     const response = await fetch(url, {
       credentials: "include",
-      headers: new Headers({ "Content-type": "application/json; charset=utf-8" })
+      headers: new Headers({ "Content-Type": "application/json; charset=utf-8" })
     });
     if (!response.ok) {
       throw new Error(`${response.status}: ${await response.text()}`);