diff --git a/examples/session-and-cookie/backend/.gitignore b/examples/session-and-cookie/backend/.gitignore
new file mode 100644
index 0000000..d84f0da
--- /dev/null
+++ b/examples/session-and-cookie/backend/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+dist
+.DS_STORE
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/.vscode/launch.json b/examples/session-and-cookie/backend/.vscode/launch.json
new file mode 100644
index 0000000..9ba4218
--- /dev/null
+++ b/examples/session-and-cookie/backend/.vscode/launch.json
@@ -0,0 +1,30 @@
+{
+    "configurations": [
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "mocha current file",
+            "program": "${workspaceFolder}/node_modules/mocha/bin/_mocha",
+            "args": [
+                "${file}"
+            ],
+            "internalConsoleOptions": "openOnSessionStart",
+            "cwd": "${workspaceFolder}"
+        },
+        {
+            "type": "node",
+            "request": "launch",
+            "name": "ts-node current file",
+            "protocol": "inspector",
+            "args": [
+                "${relativeFile}"
+            ],
+            "cwd": "${workspaceRoot}",
+            "runtimeArgs": [
+                "-r",
+                "ts-node/register"
+            ],
+            "internalConsoleOptions": "openOnSessionStart"
+        }
+    ]
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/.vscode/settings.json b/examples/session-and-cookie/backend/.vscode/settings.json
new file mode 100644
index 0000000..00ad71f
--- /dev/null
+++ b/examples/session-and-cookie/backend/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "typescript.tsdk": "node_modules\\typescript\\lib"
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/README.md b/examples/session-and-cookie/backend/README.md
new file mode 100644
index 0000000..7492c22
--- /dev/null
+++ b/examples/session-and-cookie/backend/README.md
@@ -0,0 +1,35 @@
+# TSRPC Server
+
+## Run
+### Local Dev Server
+```
+npm run dev
+```
+
+
+
+### Build
+```
+npm run build
+```
+
+---
+
+## Files
+### Generate ServiceProto
+```
+npm run proto
+```
+
+### Generate API templates
+```
+npm run api
+```
+
+### Sync shared code to client
+
+```
+npm run sync
+```
+
+> If you chose symlink when using `create-tsrpc-app`, it would re-create the symlink instead of copy files.
diff --git a/examples/session-and-cookie/backend/package.json b/examples/session-and-cookie/backend/package.json
new file mode 100644
index 0000000..bb12229
--- /dev/null
+++ b/examples/session-and-cookie/backend/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "session-and-cookie-backend",
+  "version": "0.1.0",
+  "main": "index.js",
+  "private": true,
+  "scripts": {
+    "proto": "tsrpc proto -i src/shared/protocols -o src/shared/protocols/serviceProto.ts",
+    "sync": "tsrpc sync --from src/shared --to ../frontend/src/shared",
+    "api": "tsrpc api -i src/shared/protocols/serviceProto.ts -o src/api",
+    "dev": "onchange \"src/**/*.ts\" -i -k -- ts-node \"src/index.ts\"",
+    "build": "tsrpc build"
+  },
+  "devDependencies": {
+    "@types/node": "^15.12.2",
+    "onchange": "^7.1.0",
+    "ts-node": "^9.1.1",
+    "tsrpc-cli": "^2.0.1-dev.11",
+    "typescript": "^4.3.2"
+  },
+  "dependencies": {
+    "tsrpc": "^3.0.0-dev.19"
+  }
+}
diff --git a/examples/session-and-cookie/backend/src/api/ApiClear.ts b/examples/session-and-cookie/backend/src/api/ApiClear.ts
new file mode 100644
index 0000000..d0b8e9d
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/api/ApiClear.ts
@@ -0,0 +1,9 @@
+import { ApiCall } from "tsrpc";
+import { ReqClear, ResClear } from "../shared/protocols/PtlClear";
+
+export async function ApiClear(call: ApiCall<ReqClear, ResClear>) {
+    call.succ({
+        __cookie: {},
+        __session: {}
+    })
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/api/ApiGetCookie.ts b/examples/session-and-cookie/backend/src/api/ApiGetCookie.ts
new file mode 100644
index 0000000..63f166a
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/api/ApiGetCookie.ts
@@ -0,0 +1,13 @@
+import { ApiCall } from "tsrpc";
+import { ReqGetCookie, ResGetCookie } from "../shared/protocols/PtlGetCookie";
+
+let times = 0;
+
+export async function ApiGetCookie(call: ApiCall<ReqGetCookie, ResGetCookie>) {
+    call.succ({
+        __cookie: {
+            ...call.req.__cookie,
+            testCookie: 'Cookie ' + (++times),
+        }
+    })
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/api/ApiGetSession.ts b/examples/session-and-cookie/backend/src/api/ApiGetSession.ts
new file mode 100644
index 0000000..4e5c52f
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/api/ApiGetSession.ts
@@ -0,0 +1,13 @@
+import { ApiCall } from "tsrpc";
+import { ReqGetSession, ResGetSession } from "../shared/protocols/PtlGetSession";
+
+let times = 0;
+
+export async function ApiGetSession(call: ApiCall<ReqGetSession, ResGetSession>) {
+    call.succ({
+        __session: {
+            ...call.req.__session,
+            testSession: 'Session ' + (++times)
+        }
+    })
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/api/ApiTest.ts b/examples/session-and-cookie/backend/src/api/ApiTest.ts
new file mode 100644
index 0000000..4473445
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/api/ApiTest.ts
@@ -0,0 +1,6 @@
+import { ApiCall } from "tsrpc";
+import { ReqTest, ResTest } from "../shared/protocols/PtlTest";
+
+export async function ApiTest(call: ApiCall<ReqTest, ResTest>) {
+    call.succ({});
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/index.ts b/examples/session-and-cookie/backend/src/index.ts
new file mode 100644
index 0000000..5a4dbc9
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/index.ts
@@ -0,0 +1,38 @@
+import * as path from "path";
+import { HttpServer } from "tsrpc";
+import { BaseRequest, BaseResponse } from "./shared/protocols/base";
+import { serviceProto } from "./shared/protocols/serviceProto";
+
+// Create the Server
+const server = new HttpServer(serviceProto, {
+    port: 3000,
+    cors: '*'
+});
+
+// Return session and cookie as they are, except reset by res
+server.flows.preApiReturnFlow.push(v => {
+    if (v.return.isSucc) {
+        let req = v.call.req as BaseRequest;
+        let res = v.return.res as BaseResponse;
+        res.__session = res.__session ?? req.__session;
+        res.__cookie = res.__cookie ?? req.__cookie;
+    }
+    return v;
+});
+
+// Entry function
+async function main() {
+    // Auto implement APIs
+    await server.autoImplementApi(path.resolve(__dirname, 'api'));
+
+    // TODO
+    // Prepare something... (e.g. connect the db)
+
+    await server.start();
+};
+
+main().catch(e => {
+    // Exit if any error during the startup
+    server.logger.error(e);
+    process.exit(-1);
+});
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/PtlClear.ts b/examples/session-and-cookie/backend/src/shared/protocols/PtlClear.ts
new file mode 100644
index 0000000..bd4af9b
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/PtlClear.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base';
+
+export interface ReqClear extends BaseRequest {
+
+}
+
+export interface ResClear extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/PtlGetCookie.ts b/examples/session-and-cookie/backend/src/shared/protocols/PtlGetCookie.ts
new file mode 100644
index 0000000..e77630b
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/PtlGetCookie.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqGetCookie extends BaseRequest {
+    
+}
+
+export interface ResGetCookie extends BaseResponse {
+    
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/PtlGetSession.ts b/examples/session-and-cookie/backend/src/shared/protocols/PtlGetSession.ts
new file mode 100644
index 0000000..f00f4e6
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/PtlGetSession.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqGetSession extends BaseRequest {
+
+}
+
+export interface ResGetSession extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/PtlTest.ts b/examples/session-and-cookie/backend/src/shared/protocols/PtlTest.ts
new file mode 100644
index 0000000..d3e5367
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/PtlTest.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqTest extends BaseRequest {
+
+}
+
+export interface ResTest extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/base.ts b/examples/session-and-cookie/backend/src/shared/protocols/base.ts
new file mode 100644
index 0000000..12991a0
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/base.ts
@@ -0,0 +1,9 @@
+export interface BaseRequest {
+    __session?: { [key: string]: any };
+    __cookie?: { [key: string]: any };
+}
+
+export interface BaseResponse {
+    __session?: { [key: string]: any };
+    __cookie?: { [key: string]: any };
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/src/shared/protocols/serviceProto.ts b/examples/session-and-cookie/backend/src/shared/protocols/serviceProto.ts
new file mode 100644
index 0000000..c509617
--- /dev/null
+++ b/examples/session-and-cookie/backend/src/shared/protocols/serviceProto.ts
@@ -0,0 +1,219 @@
+import { ServiceProto } from 'tsrpc-proto';
+import { ReqClear, ResClear } from './PtlClear';
+import { ReqGetCookie, ResGetCookie } from './PtlGetCookie';
+import { ReqGetSession, ResGetSession } from './PtlGetSession';
+import { ReqTest, ResTest } from './PtlTest';
+
+export interface ServiceType {
+    api: {
+        "Clear": {
+            req: ReqClear,
+            res: ResClear
+        },
+        "GetCookie": {
+            req: ReqGetCookie,
+            res: ResGetCookie
+        },
+        "GetSession": {
+            req: ReqGetSession,
+            res: ResGetSession
+        },
+        "Test": {
+            req: ReqTest,
+            res: ResTest
+        }
+    },
+    msg: {
+
+    }
+}
+
+export const serviceProto: ServiceProto<ServiceType> = {
+    "version": 3,
+    "services": [
+        {
+            "id": 3,
+            "name": "Clear",
+            "type": "api"
+        },
+        {
+            "id": 0,
+            "name": "GetCookie",
+            "type": "api"
+        },
+        {
+            "id": 1,
+            "name": "GetSession",
+            "type": "api"
+        },
+        {
+            "id": 2,
+            "name": "Test",
+            "type": "api"
+        }
+    ],
+    "types": {
+        "PtlClear/ReqClear": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "base/BaseRequest": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "__session",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                },
+                {
+                    "id": 1,
+                    "name": "__cookie",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                }
+            ]
+        },
+        "PtlClear/ResClear": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "base/BaseResponse": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "__session",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                },
+                {
+                    "id": 1,
+                    "name": "__cookie",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                }
+            ]
+        },
+        "PtlGetCookie/ReqGetCookie": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlGetCookie/ResGetCookie": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "PtlGetSession/ReqGetSession": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlGetSession/ResGetSession": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "PtlTest/ReqTest": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlTest/ResTest": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        }
+    }
+};
\ No newline at end of file
diff --git a/examples/session-and-cookie/backend/tsconfig.json b/examples/session-and-cookie/backend/tsconfig.json
new file mode 100644
index 0000000..d18498f
--- /dev/null
+++ b/examples/session-and-cookie/backend/tsconfig.json
@@ -0,0 +1,18 @@
+{
+  "compilerOptions": {
+    "lib": [
+      "es2018"
+    ],
+    "module": "commonjs",
+    "target": "es2018",
+    "outDir": "dist",
+    "strict": true,
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+    "forceConsistentCasingInFileNames": true,
+    "moduleResolution": "node"
+  },
+  "include": [
+    "src"
+  ]
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/.gitignore b/examples/session-and-cookie/frontend/.gitignore
new file mode 100644
index 0000000..ae16b5a
--- /dev/null
+++ b/examples/session-and-cookie/frontend/.gitignore
@@ -0,0 +1,3 @@
+.DS_STORE
+node_modules
+dist
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/package.json b/examples/session-and-cookie/frontend/package.json
new file mode 100644
index 0000000..7c9a0d3
--- /dev/null
+++ b/examples/session-and-cookie/frontend/package.json
@@ -0,0 +1,21 @@
+{
+  "name": "session-and-cookie-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "webpack serve --mode=development --open",
+    "build": "webpack --mode=production"
+  },
+  "devDependencies": {
+    "copy-webpack-plugin": "^9.0.0",
+    "html-webpack-plugin": "^5.3.1",
+    "ts-loader": "^9.2.3",
+    "typescript": "^4.3.2",
+    "webpack": "^5.38.1",
+    "webpack-cli": "^4.7.2",
+    "webpack-dev-server": "^3.11.2"
+  },
+  "dependencies": {
+    "tsrpc-browser": "^3.0.0-dev.15"
+  }
+}
diff --git a/examples/session-and-cookie/frontend/public/favicon.ico b/examples/session-and-cookie/frontend/public/favicon.ico
new file mode 100644
index 0000000..e69de29
diff --git a/examples/session-and-cookie/frontend/public/index.css b/examples/session-and-cookie/frontend/public/index.css
new file mode 100644
index 0000000..7b8b068
--- /dev/null
+++ b/examples/session-and-cookie/frontend/public/index.css
@@ -0,0 +1,46 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    text-align: center;
+}
+
+body>* {
+    margin: 20px auto;
+}
+
+.buttons {
+    width: 450px;
+    font-size: 0px;
+}
+
+.buttons>button {
+    display: inline-block;
+    font-size: 16px;
+    margin: 10px;
+    padding: 20px;
+    width: calc(50% - 20px);
+    background: #3178c6;
+    color: #fff;
+    cursor: pointer;
+    border-radius: 4px;
+    border: none;
+}
+
+.buttons>button:hover {
+    background: #5ea8e9;
+}
+
+pre {
+    background: #333;
+    width: 450px;
+    padding: 20px;
+    min-height: 100px;
+    font-size: 14px;
+    color: #fff;
+    text-align: left;
+    border-radius: 4px;
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/public/index.html b/examples/session-and-cookie/frontend/public/index.html
new file mode 100644
index 0000000..24ee9f8
--- /dev/null
+++ b/examples/session-and-cookie/frontend/public/index.html
@@ -0,0 +1,29 @@
+<!DOCTYPE html>
+<html>
+
+<head>
+    <meta charset="UTF-8">
+    <meta http-equiv="X-UA-Compatible" content="IE=edge">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>TSRPC Example</title>
+    <link rel="stylesheet" href="index.css" />
+</head>
+
+<body>
+    <h1>Session and Cookie</h1>
+
+    <div class="buttons">
+        <button id="btnTest">Test</button>
+        <button id="btnClear">Clear</button>
+        <button id="btnGetSession">Get Session</button>
+        <button id="btnGetCookie">Get Cookie</button>
+    </div>
+
+    <h2>API Request</h2>
+    <pre class="apiReq"></pre>
+
+    <h2>API Return</h2>
+    <pre class="apiReturn"></pre>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/index.ts b/examples/session-and-cookie/frontend/src/index.ts
new file mode 100644
index 0000000..5179ae1
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/index.ts
@@ -0,0 +1,31 @@
+import { HttpClient } from 'tsrpc-browser';
+import { enableSessionAndCookie } from './models/enableSessionAndCookie';
+import { showReqAndRes } from './models/showReqAndRes';
+import { serviceProto } from './shared/protocols/serviceProto';
+
+// Create Client
+let client = new HttpClient(serviceProto, {
+    server: 'http://127.0.0.1:3000',
+    logger: console
+});
+
+// Session and Cookie
+enableSessionAndCookie(client);
+
+// Show Req and Return to View
+showReqAndRes(client);
+
+// Bind Events
+const $ = document.querySelector.bind(document) as (v: string) => HTMLElement;
+$('#btnTest').onclick = () => {
+    client.callApi('Test', {});
+};
+$('#btnClear').onclick = () => {
+    client.callApi('Clear', {});
+};
+$('#btnGetCookie').onclick = () => {
+    client.callApi('GetCookie', {});
+};
+$('#btnGetSession').onclick = () => {
+    client.callApi('GetSession', {});
+};
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/models/enableSessionAndCookie.ts b/examples/session-and-cookie/frontend/src/models/enableSessionAndCookie.ts
new file mode 100644
index 0000000..0ed7f5c
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/models/enableSessionAndCookie.ts
@@ -0,0 +1,35 @@
+import { HttpClient } from "tsrpc-browser";
+
+const CookieStorageKey = '__MY_COOKIE__';
+const SessionStorageKey = '__MY_SESSION__';
+
+export function enableSessionAndCookie(client: HttpClient<any>) {
+    // Send
+    client.flows.preCallApiFlow.push(v => {
+        // Auto get __cookie from localStorage
+        let cookieStr = localStorage.getItem(CookieStorageKey);
+        v.req.__cookie = cookieStr ? JSON.parse(cookieStr) : undefined;
+
+        // Auto get __session from sessionStorage
+        let sessionStr = sessionStorage.getItem(SessionStorageKey);
+        v.req.__session = sessionStr ? JSON.parse(sessionStr) : undefined;
+
+        return v;
+    })
+
+    // Return
+    client.flows.preApiReturnFlow.push(v => {
+        if (v.return.isSucc) {
+            // Auto set __cookie to localStorage
+            if (v.return.res.__cookie) {
+                localStorage.setItem(CookieStorageKey, JSON.stringify(v.return.res.__cookie))
+            }
+            // Auto set __session to sessionStorage
+            if (v.return.res.__session) {
+                sessionStorage.setItem(SessionStorageKey, JSON.stringify(v.return.res.__session))
+            }
+        }
+
+        return v;
+    })
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/models/showReqAndRes.ts b/examples/session-and-cookie/frontend/src/models/showReqAndRes.ts
new file mode 100644
index 0000000..f670996
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/models/showReqAndRes.ts
@@ -0,0 +1,10 @@
+import { HttpClient } from "tsrpc-browser";
+
+export function showReqAndRes(client: HttpClient<any>) {
+    // Send
+    client.flows.postApiReturnFlow.push(v => {
+        (document.querySelector('.apiReq') as HTMLElement).innerText = 'callApi: ' + v.apiName + '\n\n' + JSON.stringify(v.req, null, 2);
+        (document.querySelector('.apiReturn') as HTMLElement).innerText = JSON.stringify(v.return, null, 2);
+        return v;
+    });
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/PtlClear.ts b/examples/session-and-cookie/frontend/src/shared/protocols/PtlClear.ts
new file mode 100644
index 0000000..bd4af9b
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/PtlClear.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base';
+
+export interface ReqClear extends BaseRequest {
+
+}
+
+export interface ResClear extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetCookie.ts b/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetCookie.ts
new file mode 100644
index 0000000..e77630b
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetCookie.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqGetCookie extends BaseRequest {
+    
+}
+
+export interface ResGetCookie extends BaseResponse {
+    
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetSession.ts b/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetSession.ts
new file mode 100644
index 0000000..f00f4e6
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/PtlGetSession.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqGetSession extends BaseRequest {
+
+}
+
+export interface ResGetSession extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/PtlTest.ts b/examples/session-and-cookie/frontend/src/shared/protocols/PtlTest.ts
new file mode 100644
index 0000000..d3e5367
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/PtlTest.ts
@@ -0,0 +1,9 @@
+import { BaseRequest, BaseResponse } from './base'
+
+export interface ReqTest extends BaseRequest {
+
+}
+
+export interface ResTest extends BaseResponse {
+
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/base.ts b/examples/session-and-cookie/frontend/src/shared/protocols/base.ts
new file mode 100644
index 0000000..12991a0
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/base.ts
@@ -0,0 +1,9 @@
+export interface BaseRequest {
+    __session?: { [key: string]: any };
+    __cookie?: { [key: string]: any };
+}
+
+export interface BaseResponse {
+    __session?: { [key: string]: any };
+    __cookie?: { [key: string]: any };
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/src/shared/protocols/serviceProto.ts b/examples/session-and-cookie/frontend/src/shared/protocols/serviceProto.ts
new file mode 100644
index 0000000..c509617
--- /dev/null
+++ b/examples/session-and-cookie/frontend/src/shared/protocols/serviceProto.ts
@@ -0,0 +1,219 @@
+import { ServiceProto } from 'tsrpc-proto';
+import { ReqClear, ResClear } from './PtlClear';
+import { ReqGetCookie, ResGetCookie } from './PtlGetCookie';
+import { ReqGetSession, ResGetSession } from './PtlGetSession';
+import { ReqTest, ResTest } from './PtlTest';
+
+export interface ServiceType {
+    api: {
+        "Clear": {
+            req: ReqClear,
+            res: ResClear
+        },
+        "GetCookie": {
+            req: ReqGetCookie,
+            res: ResGetCookie
+        },
+        "GetSession": {
+            req: ReqGetSession,
+            res: ResGetSession
+        },
+        "Test": {
+            req: ReqTest,
+            res: ResTest
+        }
+    },
+    msg: {
+
+    }
+}
+
+export const serviceProto: ServiceProto<ServiceType> = {
+    "version": 3,
+    "services": [
+        {
+            "id": 3,
+            "name": "Clear",
+            "type": "api"
+        },
+        {
+            "id": 0,
+            "name": "GetCookie",
+            "type": "api"
+        },
+        {
+            "id": 1,
+            "name": "GetSession",
+            "type": "api"
+        },
+        {
+            "id": 2,
+            "name": "Test",
+            "type": "api"
+        }
+    ],
+    "types": {
+        "PtlClear/ReqClear": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "base/BaseRequest": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "__session",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                },
+                {
+                    "id": 1,
+                    "name": "__cookie",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                }
+            ]
+        },
+        "PtlClear/ResClear": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "base/BaseResponse": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "__session",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                },
+                {
+                    "id": 1,
+                    "name": "__cookie",
+                    "type": {
+                        "type": "Interface",
+                        "indexSignature": {
+                            "keyType": "String",
+                            "type": {
+                                "type": "Any"
+                            }
+                        }
+                    },
+                    "optional": true
+                }
+            ]
+        },
+        "PtlGetCookie/ReqGetCookie": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlGetCookie/ResGetCookie": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "PtlGetSession/ReqGetSession": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlGetSession/ResGetSession": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        },
+        "PtlTest/ReqTest": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseRequest"
+                    }
+                }
+            ]
+        },
+        "PtlTest/ResTest": {
+            "type": "Interface",
+            "extends": [
+                {
+                    "id": 0,
+                    "type": {
+                        "type": "Reference",
+                        "target": "base/BaseResponse"
+                    }
+                }
+            ]
+        }
+    }
+};
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/tsconfig.json b/examples/session-and-cookie/frontend/tsconfig.json
new file mode 100644
index 0000000..7517bf5
--- /dev/null
+++ b/examples/session-and-cookie/frontend/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "lib": [
+      "dom",
+      "es2018"
+    ],
+    "module": "esnext",
+    "target": "es2018",
+    "allowSyntheticDefaultImports": true,
+    "esModuleInterop": true,
+    "forceConsistentCasingInFileNames": true,
+    "moduleResolution": "node",
+    "outDir": "dist",
+    "skipLibCheck": true,
+    "strict": true,
+    "jsx": "react-jsx",
+    "sourceMap": true,
+    "isolatedModules": true
+  },
+  "include": [
+    "src"
+  ]
+}
\ No newline at end of file
diff --git a/examples/session-and-cookie/frontend/webpack.config.js b/examples/session-and-cookie/frontend/webpack.config.js
new file mode 100644
index 0000000..062d1a4
--- /dev/null
+++ b/examples/session-and-cookie/frontend/webpack.config.js
@@ -0,0 +1,58 @@
+const webpack = require('webpack');
+const path = require('path');
+const HtmlWebpackPlugin = require('html-webpack-plugin');
+const CopyWebpackPlugin = require('copy-webpack-plugin');
+
+const isProduction = process.argv.indexOf('--mode=production') > -1;
+
+module.exports = {
+    entry: './src/index.ts',
+    output: {
+        filename: 'bundle.[contenthash].js',
+        path: path.resolve(__dirname, 'dist'),
+        clean: true
+    },
+    resolve: {
+        extensions: ['.ts', '.tsx', '.js']
+    },
+    module: {
+        rules: [
+            {
+                test: /\.tsx?$/,
+                use: [{
+                    loader: 'ts-loader',
+                    options: {
+                        compilerOptions: isProduction ? {
+                            "lib": [
+                                "dom",
+                                "es2015.promise"
+                            ],
+                            "target": "es5",
+                        } : undefined
+                    }
+                }],
+                exclude: /node_modules/
+            },
+        ]
+    },
+    plugins: [
+        // Copy "public" to "dist"
+        new CopyWebpackPlugin({
+            patterns: [{
+                from: 'public',
+                to: '.',
+                toType: 'dir',
+                globOptions: {
+                    gitignore: true,
+                    ignore: [path.resolve(__dirname, 'public/index.html').replace(/\\/g, '/')]
+                },
+                noErrorOnMissing: true
+            }]
+        }),
+        // Auto add <script> to "index.html"
+        new HtmlWebpackPlugin({
+            template: 'public/index.html'
+        }),
+    ],
+    devtool: isProduction ? false : 'inline-source-map'
+}
\ No newline at end of file