diff --git a/examples/client-mock/backend/.gitignore b/examples/client-mock/backend/.gitignore
new file mode 100644
index 0000000..d84f0da
--- /dev/null
+++ b/examples/client-mock/backend/.gitignore
@@ -0,0 +1,3 @@
+node_modules
+dist
+.DS_STORE
\ No newline at end of file
diff --git a/examples/client-mock/backend/.vscode/launch.json b/examples/client-mock/backend/.vscode/launch.json
new file mode 100644
index 0000000..9ba4218
--- /dev/null
+++ b/examples/client-mock/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/client-mock/backend/.vscode/settings.json b/examples/client-mock/backend/.vscode/settings.json
new file mode 100644
index 0000000..00ad71f
--- /dev/null
+++ b/examples/client-mock/backend/.vscode/settings.json
@@ -0,0 +1,3 @@
+{
+    "typescript.tsdk": "node_modules\\typescript\\lib"
+}
\ No newline at end of file
diff --git a/examples/client-mock/backend/README.md b/examples/client-mock/backend/README.md
new file mode 100644
index 0000000..7492c22
--- /dev/null
+++ b/examples/client-mock/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/client-mock/backend/package.json b/examples/client-mock/backend/package.json
new file mode 100644
index 0000000..d9e35bd
--- /dev/null
+++ b/examples/client-mock/backend/package.json
@@ -0,0 +1,23 @@
+{
+  "name": "client-mock-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": "^15.12.5",
+    "onchange": "^7.1.0",
+    "ts-node": "^10.0.0",
+    "tsrpc-cli": "^2.0.3",
+    "typescript": "^4.3.4"
+  },
+  "dependencies": {
+    "tsrpc": "^3.0.4"
+  }
+}
diff --git a/examples/client-mock/backend/src/api/ApiAddData.ts b/examples/client-mock/backend/src/api/ApiAddData.ts
new file mode 100644
index 0000000..c064789
--- /dev/null
+++ b/examples/client-mock/backend/src/api/ApiAddData.ts
@@ -0,0 +1,26 @@
+import { ApiCall } from "tsrpc";
+import { ReqAddData, ResAddData } from "../shared/protocols/PtlAddData";
+import { AllData } from "./ApiGetData";
+
+// This is a demo code file
+// Feel free to delete it
+
+export async function ApiAddData(call: ApiCall<ReqAddData, ResAddData>) {
+    // Error
+    if (call.req.content === '') {
+        call.error('Content is empty');
+        return;
+    }
+
+    let time = new Date();
+    AllData.unshift({
+        content: call.req.content,
+        time: time
+    })
+    console.log('AllData', AllData)
+
+    // Success
+    call.succ({
+        time: time
+    });
+}
\ No newline at end of file
diff --git a/examples/client-mock/backend/src/api/ApiGetData.ts b/examples/client-mock/backend/src/api/ApiGetData.ts
new file mode 100644
index 0000000..2996ee4
--- /dev/null
+++ b/examples/client-mock/backend/src/api/ApiGetData.ts
@@ -0,0 +1,13 @@
+import { ApiCall } from "tsrpc";
+import { ReqGetData, ResGetData } from "../shared/protocols/PtlGetData";
+
+// This is a demo code file
+// Feel free to delete it
+
+export async function ApiGetData(call: ApiCall<ReqGetData, ResGetData>) {
+    call.succ({
+        data: AllData
+    })
+}
+
+export const AllData: { content: string, time: Date }[] = [];
\ No newline at end of file
diff --git a/examples/client-mock/backend/src/index.ts b/examples/client-mock/backend/src/index.ts
new file mode 100644
index 0000000..7dcc249
--- /dev/null
+++ b/examples/client-mock/backend/src/index.ts
@@ -0,0 +1,26 @@
+import * as path from "path";
+import { HttpServer } from "tsrpc";
+import { serviceProto } from "./shared/protocols/serviceProto";
+
+// Create the Server
+const server = new HttpServer(serviceProto, {
+    port: 3000,
+    cors: '*'
+});
+
+// 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/client-mock/backend/src/shared/protocols/PtlAddData.ts b/examples/client-mock/backend/src/shared/protocols/PtlAddData.ts
new file mode 100644
index 0000000..7f442ae
--- /dev/null
+++ b/examples/client-mock/backend/src/shared/protocols/PtlAddData.ts
@@ -0,0 +1,10 @@
+// This is a demo code file
+// Feel free to delete it
+
+export interface ReqAddData {
+    content: string;
+}
+
+export interface ResAddData {
+    time: Date
+}
\ No newline at end of file
diff --git a/examples/client-mock/backend/src/shared/protocols/PtlGetData.ts b/examples/client-mock/backend/src/shared/protocols/PtlGetData.ts
new file mode 100644
index 0000000..8ac35a7
--- /dev/null
+++ b/examples/client-mock/backend/src/shared/protocols/PtlGetData.ts
@@ -0,0 +1,13 @@
+// This is a demo code file
+// Feel free to delete it
+
+export interface ReqGetData {
+    
+}
+
+export interface ResGetData {
+    data: {
+        content: string,
+        time: Date
+    }[]
+}
\ No newline at end of file
diff --git a/examples/client-mock/backend/src/shared/protocols/serviceProto.ts b/examples/client-mock/backend/src/shared/protocols/serviceProto.ts
new file mode 100644
index 0000000..e7207a9
--- /dev/null
+++ b/examples/client-mock/backend/src/shared/protocols/serviceProto.ts
@@ -0,0 +1,98 @@
+import { ServiceProto } from 'tsrpc-proto';
+import { ReqAddData, ResAddData } from './PtlAddData';
+import { ReqGetData, ResGetData } from './PtlGetData';
+
+// This is a demo service proto file (auto generated)
+// Feel free to delete it
+
+export interface ServiceType {
+    api: {
+        "AddData": {
+            req: ReqAddData,
+            res: ResAddData
+        },
+        "GetData": {
+            req: ReqGetData,
+            res: ResGetData
+        }
+    },
+    msg: {
+
+    }
+}
+
+export const serviceProto: ServiceProto<ServiceType> = {
+    "version": 1,
+    "services": [
+        {
+            "id": 0,
+            "name": "AddData",
+            "type": "api"
+        },
+        {
+            "id": 1,
+            "name": "GetData",
+            "type": "api"
+        }
+    ],
+    "types": {
+        "PtlAddData/ReqAddData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "content",
+                    "type": {
+                        "type": "String"
+                    }
+                }
+            ]
+        },
+        "PtlAddData/ResAddData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "time",
+                    "type": {
+                        "type": "Date"
+                    }
+                }
+            ]
+        },
+        "PtlGetData/ReqGetData": {
+            "type": "Interface"
+        },
+        "PtlGetData/ResGetData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "data",
+                    "type": {
+                        "type": "Array",
+                        "elementType": {
+                            "type": "Interface",
+                            "properties": [
+                                {
+                                    "id": 0,
+                                    "name": "content",
+                                    "type": {
+                                        "type": "String"
+                                    }
+                                },
+                                {
+                                    "id": 1,
+                                    "name": "time",
+                                    "type": {
+                                        "type": "Date"
+                                    }
+                                }
+                            ]
+                        }
+                    }
+                }
+            ]
+        }
+    }
+};
\ No newline at end of file
diff --git a/examples/client-mock/backend/tsconfig.json b/examples/client-mock/backend/tsconfig.json
new file mode 100644
index 0000000..d18498f
--- /dev/null
+++ b/examples/client-mock/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/client-mock/frontend/.gitignore b/examples/client-mock/frontend/.gitignore
new file mode 100644
index 0000000..ae16b5a
--- /dev/null
+++ b/examples/client-mock/frontend/.gitignore
@@ -0,0 +1,3 @@
+.DS_STORE
+node_modules
+dist
\ No newline at end of file
diff --git a/examples/client-mock/frontend/package.json b/examples/client-mock/frontend/package.json
new file mode 100644
index 0000000..e44937d
--- /dev/null
+++ b/examples/client-mock/frontend/package.json
@@ -0,0 +1,24 @@
+{
+  "name": "client-mock-frontend",
+  "version": "0.1.0",
+  "private": true,
+  "scripts": {
+    "dev": "webpack serve --mode=development --open",
+    "build": "webpack --mode=production"
+  },
+  "devDependencies": {
+    "copy-webpack-plugin": "^9.0.1",
+    "html-webpack-plugin": "^5.3.2",
+    "ts-loader": "^9.2.3",
+    "typescript": "^4.3.4",
+    "webpack": "^5.41.1",
+    "webpack-cli": "^4.7.2",
+    "webpack-dev-server": "^3.11.2"
+  },
+  "dependencies": {
+    "tsrpc-browser": "^3.0.4"
+  },
+  "browserslist": [
+    "defaults"
+  ]
+}
diff --git a/examples/client-mock/frontend/public/favicon.ico b/examples/client-mock/frontend/public/favicon.ico
new file mode 100644
index 0000000..361535c
Binary files /dev/null and b/examples/client-mock/frontend/public/favicon.ico differ
diff --git a/examples/client-mock/frontend/public/index.css b/examples/client-mock/frontend/public/index.css
new file mode 100644
index 0000000..bdef476
--- /dev/null
+++ b/examples/client-mock/frontend/public/index.css
@@ -0,0 +1,83 @@
+* {
+    margin: 0;
+    padding: 0;
+    box-sizing: border-box;
+}
+
+body {
+    text-align: center;
+}
+
+body>* {
+    margin: 20px auto;
+}
+
+.send,
+.list {
+    width: 370px;
+}
+
+.send>* {
+    display: block;
+    width: 100%;
+    margin: 10px auto;
+    padding: 10px;
+    border-radius: 5px;
+    font-size: 16px;
+    border: none;
+    outline: none;
+}
+
+.send>textarea {
+    height: 80px;
+    background: #f7f7f7;
+    border: #eeeeee 1px solid;
+}
+
+.send>textarea:focus {
+    background: #fff;
+    border-color: #ccc;
+}
+
+.send>button {
+    background: #215fa4;
+    color: white;
+    cursor: pointer;
+}
+
+.send>button:hover {
+    background: #4b80bb;
+}
+
+.list {
+    list-style: none;
+    border-radius: 5px;
+    padding: 10px;
+    background: #f2f2f2;
+}
+
+.list>li {
+    margin-bottom: 10px;
+    padding: 10px;
+    background: #fff;
+    line-height: 1.5em;
+    border-radius: 5px;
+}
+
+.list>li>.content {
+    font-size: 14px;
+    text-align: left;
+    white-space: pre-wrap;
+    word-wrap: break-word;
+}
+
+.list>li>.time {
+    font-size: 12px;
+    color: #4b80bb;
+    text-align: right;
+}
+
+.list>li:last-child {
+    border-bottom: none;
+    margin-bottom: 0;
+}
\ No newline at end of file
diff --git a/examples/client-mock/frontend/public/index.html b/examples/client-mock/frontend/public/index.html
new file mode 100644
index 0000000..8ac22f5
--- /dev/null
+++ b/examples/client-mock/frontend/public/index.html
@@ -0,0 +1,28 @@
+<!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 Browser</title>
+    <link rel="stylesheet" href="index.css" />
+</head>
+
+<body>
+    <h1>TSRPC Guestbook</h1>
+
+    <div class="send">
+        <textarea placeholder="Say something..."></textarea>
+        <button>Send</button>
+    </div>
+
+    <ul class="list">
+        <!-- <li>
+            <div class="content">Hello, World</div>
+            <div class="time">11:23:23</div>
+        </li> -->
+    </ul>
+</body>
+
+</html>
\ No newline at end of file
diff --git a/examples/client-mock/frontend/src/index.ts b/examples/client-mock/frontend/src/index.ts
new file mode 100644
index 0000000..6174ab3
--- /dev/null
+++ b/examples/client-mock/frontend/src/index.ts
@@ -0,0 +1,100 @@
+import { HttpClient, TsrpcError } from 'tsrpc-browser';
+import { serviceProto } from './shared/protocols/serviceProto';
+
+// This is a demo code file
+// Feel free to modify or clear it
+
+// Create Client
+let client = new HttpClient(serviceProto, {
+    server: 'http://127.0.0.1:3000',
+    logger: console
+});
+
+// Mock 后端逻辑临时存储数据
+let data: {
+    content: string,
+    time: Date
+}[] = [];
+
+// Client Mock
+client.flows.preCallApiFlow.push(v => {
+    // 模拟网络错误：20% 网络错误概率
+    if (Math.random() < 0.2) {
+        // 模拟返回
+        v.return = {
+            isSucc: false,
+            err: new TsrpcError('模拟网络错误: ' + v.apiName, {
+                type: TsrpcError.Type.NetworkError
+            })
+        }
+        return v;
+    }
+
+    // 模拟后端逻辑， Mock 返回结果，实际不请求后端
+    client.logger?.log('[MockReq]', v.apiName, v.req);
+    if (v.apiName === 'AddData') {
+        let time = new Date();
+        data.unshift({ content: v.req.content, time: time })
+        v.return = {
+            isSucc: true,
+            res: { time: time }
+        }
+    }
+    else if (v.apiName === 'GetData') {
+        v.return = {
+            isSucc: true,
+            res: {
+                data: data
+            }
+        }
+    }
+    client.logger?.log('[MockRes]', v.apiName, v.return);
+
+    return v;
+})
+
+// Reload message list
+async function loadList() {
+    let ret = await client.callApi('GetData', {});
+
+    // Error
+    if (!ret.isSucc) {
+        alert(ret.err.message);
+        return;
+    }
+
+    // Success
+    const list = document.querySelector('.list')!;
+    list.innerHTML = '';
+    ret.res.data.forEach(v => {
+        let li = document.createElement('li');
+        li.innerHTML = `<div class="content"></div><div class="time"></div>`;
+        (li.querySelector('.content') as HTMLDivElement).innerText = v.content;
+        (li.querySelector('.time') as HTMLDivElement).innerText = v.time.toLocaleTimeString();
+        list.appendChild(li);
+    })
+}
+
+// Send Message
+async function send() {
+    const textarea = document.querySelector('.send>textarea') as HTMLTextAreaElement;
+    let ret = await client.callApi('AddData', {
+        content: textarea.value
+    });
+
+    // Error
+    if (!ret.isSucc) {
+        alert(ret.err.message);
+        return;
+    }
+
+    // Success
+    textarea.value = '';
+    loadList();
+}
+
+// Bind Events
+(document.querySelector('.send>button') as HTMLButtonElement).onclick = send;
+
+// Load list after page load
+loadList();
\ No newline at end of file
diff --git a/examples/client-mock/frontend/src/shared/protocols/PtlAddData.ts b/examples/client-mock/frontend/src/shared/protocols/PtlAddData.ts
new file mode 100644
index 0000000..7f442ae
--- /dev/null
+++ b/examples/client-mock/frontend/src/shared/protocols/PtlAddData.ts
@@ -0,0 +1,10 @@
+// This is a demo code file
+// Feel free to delete it
+
+export interface ReqAddData {
+    content: string;
+}
+
+export interface ResAddData {
+    time: Date
+}
\ No newline at end of file
diff --git a/examples/client-mock/frontend/src/shared/protocols/PtlGetData.ts b/examples/client-mock/frontend/src/shared/protocols/PtlGetData.ts
new file mode 100644
index 0000000..8ac35a7
--- /dev/null
+++ b/examples/client-mock/frontend/src/shared/protocols/PtlGetData.ts
@@ -0,0 +1,13 @@
+// This is a demo code file
+// Feel free to delete it
+
+export interface ReqGetData {
+    
+}
+
+export interface ResGetData {
+    data: {
+        content: string,
+        time: Date
+    }[]
+}
\ No newline at end of file
diff --git a/examples/client-mock/frontend/src/shared/protocols/serviceProto.ts b/examples/client-mock/frontend/src/shared/protocols/serviceProto.ts
new file mode 100644
index 0000000..e7207a9
--- /dev/null
+++ b/examples/client-mock/frontend/src/shared/protocols/serviceProto.ts
@@ -0,0 +1,98 @@
+import { ServiceProto } from 'tsrpc-proto';
+import { ReqAddData, ResAddData } from './PtlAddData';
+import { ReqGetData, ResGetData } from './PtlGetData';
+
+// This is a demo service proto file (auto generated)
+// Feel free to delete it
+
+export interface ServiceType {
+    api: {
+        "AddData": {
+            req: ReqAddData,
+            res: ResAddData
+        },
+        "GetData": {
+            req: ReqGetData,
+            res: ResGetData
+        }
+    },
+    msg: {
+
+    }
+}
+
+export const serviceProto: ServiceProto<ServiceType> = {
+    "version": 1,
+    "services": [
+        {
+            "id": 0,
+            "name": "AddData",
+            "type": "api"
+        },
+        {
+            "id": 1,
+            "name": "GetData",
+            "type": "api"
+        }
+    ],
+    "types": {
+        "PtlAddData/ReqAddData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "content",
+                    "type": {
+                        "type": "String"
+                    }
+                }
+            ]
+        },
+        "PtlAddData/ResAddData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "time",
+                    "type": {
+                        "type": "Date"
+                    }
+                }
+            ]
+        },
+        "PtlGetData/ReqGetData": {
+            "type": "Interface"
+        },
+        "PtlGetData/ResGetData": {
+            "type": "Interface",
+            "properties": [
+                {
+                    "id": 0,
+                    "name": "data",
+                    "type": {
+                        "type": "Array",
+                        "elementType": {
+                            "type": "Interface",
+                            "properties": [
+                                {
+                                    "id": 0,
+                                    "name": "content",
+                                    "type": {
+                                        "type": "String"
+                                    }
+                                },
+                                {
+                                    "id": 1,
+                                    "name": "time",
+                                    "type": {
+                                        "type": "Date"
+                                    }
+                                }
+                            ]
+                        }
+                    }
+                }
+            ]
+        }
+    }
+};
\ No newline at end of file
diff --git a/examples/client-mock/frontend/tsconfig.json b/examples/client-mock/frontend/tsconfig.json
new file mode 100644
index 0000000..f7f1d7c
--- /dev/null
+++ b/examples/client-mock/frontend/tsconfig.json
@@ -0,0 +1,23 @@
+{
+  "compilerOptions": {
+    "lib": [
+      "dom",
+      "es2015"
+    ],
+    "module": "esnext",
+    "target": "es5",
+    "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/client-mock/frontend/webpack.config.js b/examples/client-mock/frontend/webpack.config.js
new file mode 100644
index 0000000..b0d3703
--- /dev/null
+++ b/examples/client-mock/frontend/webpack.config.js
@@ -0,0 +1,56 @@
+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', '.mjs', '.cjs']
+    },
+    module: {
+        rules: [
+            {
+                test: /\.tsx?$/,
+                use: [{
+                    loader: 'ts-loader',
+                    options: {
+                        // Compile to ES5 in production mode for better compatibility
+                        // Compile to ES2018 in development for better debugging (like async/await)
+                        compilerOptions: !isProduction ? {
+                            "target": "es2018",
+                        } : 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