diff --git a/.gitignore b/.gitignore
index f661b91..6edd850 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,2 @@
 /node_modules
-/built
 npm-debug.log
diff --git a/built/general.d.ts b/built/general.d.ts
new file mode 100644
index 0000000..95fe685
--- /dev/null
+++ b/built/general.d.ts
@@ -0,0 +1,4 @@
+import * as URL from 'node:url';
+import Summary from './summary.js';
+declare const _default: (url: URL.Url, lang?: string | null) => Promise<Summary | null>;
+export default _default;
diff --git a/built/general.js b/built/general.js
new file mode 100644
index 0000000..ac1d711
--- /dev/null
+++ b/built/general.js
@@ -0,0 +1,98 @@
+import * as URL from 'node:url';
+import clip from './utils/clip.js';
+import cleanupTitle from './utils/cleanup-title.js';
+import { decode as decodeHtml } from 'html-entities';
+import { head, scpaping } from './utils/got.js';
+export default async (url, lang = null) => {
+    if (lang && !lang.match(/^[\w-]+(\s*,\s*[\w-]+)*$/))
+        lang = null;
+    const res = await scpaping(url.href, { lang: lang || undefined });
+    const $ = res.$;
+    const twitterCard = $('meta[property="twitter:card"]').attr('content');
+    let title = $('meta[property="og:title"]').attr('content') ||
+        $('meta[property="twitter:title"]').attr('content') ||
+        $('title').text();
+    if (title === undefined || title === null) {
+        return null;
+    }
+    title = clip(decodeHtml(title), 100);
+    let image = $('meta[property="og:image"]').attr('content') ||
+        $('meta[property="twitter:image"]').attr('content') ||
+        $('link[rel="image_src"]').attr('href') ||
+        $('link[rel="apple-touch-icon"]').attr('href') ||
+        $('link[rel="apple-touch-icon image_src"]').attr('href');
+    image = image ? URL.resolve(url.href, image) : null;
+    const playerUrl = (twitterCard !== 'summary_large_image' && $('meta[property="twitter:player"]').attr('content')) ||
+        (twitterCard !== 'summary_large_image' && $('meta[name="twitter:player"]').attr('content')) ||
+        $('meta[property="og:video"]').attr('content') ||
+        $('meta[property="og:video:secure_url"]').attr('content') ||
+        $('meta[property="og:video:url"]').attr('content');
+    const playerWidth = parseInt($('meta[property="twitter:player:width"]').attr('content') ||
+        $('meta[name="twitter:player:width"]').attr('content') ||
+        $('meta[property="og:video:width"]').attr('content') ||
+        '');
+    const playerHeight = parseInt($('meta[property="twitter:player:height"]').attr('content') ||
+        $('meta[name="twitter:player:height"]').attr('content') ||
+        $('meta[property="og:video:height"]').attr('content') ||
+        '');
+    let description = $('meta[property="og:description"]').attr('content') ||
+        $('meta[property="twitter:description"]').attr('content') ||
+        $('meta[name="description"]').attr('content');
+    description = description
+        ? clip(decodeHtml(description), 300)
+        : null;
+    if (title === description) {
+        description = null;
+    }
+    let siteName = $('meta[property="og:site_name"]').attr('content') ||
+        $('meta[name="application-name"]').attr('content') ||
+        url.hostname;
+    siteName = siteName ? decodeHtml(siteName) : null;
+    const favicon = $('link[rel="shortcut icon"]').attr('href') ||
+        $('link[rel="icon"]').attr('href') ||
+        '/favicon.ico';
+    const sensitive = $('.tweet').attr('data-possibly-sensitive') === 'true';
+    const find = async (path) => {
+        const target = URL.resolve(url.href, path);
+        try {
+            await head(target);
+            return target;
+        }
+        catch (e) {
+            return null;
+        }
+    };
+    // 相対的なURL (ex. test) を絶対的 (ex. /test) に変換
+    const toAbsolute = (relativeURLString) => {
+        const relativeURL = URL.parse(relativeURLString);
+        const isAbsolute = relativeURL.slashes || relativeURL.path !== null && relativeURL.path[0] === '/';
+        // 既に絶対的なら、即座に値を返却
+        if (isAbsolute) {
+            return relativeURLString;
+        }
+        // スラッシュを付けて返却
+        return '/' + relativeURLString;
+    };
+    const icon = await find(favicon) ||
+        // 相対指定を絶対指定に変換し再試行
+        await find(toAbsolute(favicon)) ||
+        null;
+    // Clean up the title
+    title = cleanupTitle(title, siteName);
+    if (title === '') {
+        title = siteName;
+    }
+    return {
+        title: title || null,
+        icon: icon || null,
+        description: description || null,
+        thumbnail: image || null,
+        player: {
+            url: playerUrl || null,
+            width: Number.isNaN(playerWidth) ? null : playerWidth,
+            height: Number.isNaN(playerHeight) ? null : playerHeight
+        },
+        sitename: siteName || null,
+        sensitive,
+    };
+};
diff --git a/built/index.d.ts b/built/index.d.ts
new file mode 100644
index 0000000..f3e2f03
--- /dev/null
+++ b/built/index.d.ts
@@ -0,0 +1,39 @@
+/**
+ * summaly
+ * https://github.com/syuilo/summaly
+ */
+import Summary from './summary.js';
+import type { IPlugin as _IPlugin } from './iplugin.js';
+export declare type IPlugin = _IPlugin;
+import * as Got from 'got';
+import type { FastifyInstance } from 'fastify';
+declare type Options = {
+    /**
+     * Accept-Language for the request
+     */
+    lang?: string | null;
+    /**
+     * Whether follow redirects
+     */
+    followRedirects?: boolean;
+    /**
+     * Custom Plugins
+     */
+    plugins?: IPlugin[];
+    /**
+     * Custom HTTP agent
+     */
+    agent?: Got.Agents;
+};
+declare type Result = Summary & {
+    /**
+     * The actual url of that web page
+     */
+    url: string;
+};
+/**
+ * Summarize an web page
+ */
+export declare const summaly: (url: string, options?: Options | undefined) => Promise<Result>;
+export default function (fastify: FastifyInstance, options: Options, done: (err?: Error) => void): void;
+export {};
diff --git a/built/index.js b/built/index.js
new file mode 100644
index 0000000..8a6524f
--- /dev/null
+++ b/built/index.js
@@ -0,0 +1,68 @@
+/**
+ * summaly
+ * https://github.com/syuilo/summaly
+ */
+import * as URL from 'node:url';
+import tracer from 'trace-redirect';
+import general from './general.js';
+import { setAgent } from './utils/got.js';
+import { plugins as builtinPlugins } from './plugins/index.js';
+const defaultOptions = {
+    lang: null,
+    followRedirects: true,
+    plugins: [],
+};
+/**
+ * Summarize an web page
+ */
+export const summaly = async (url, options) => {
+    if (options?.agent)
+        setAgent(options.agent);
+    const opts = Object.assign(defaultOptions, options);
+    const plugins = builtinPlugins.concat(opts.plugins || []);
+    let actualUrl = url;
+    if (opts.followRedirects) {
+        // .catch(() => url)にすればいいけど、jestにtrace-redirectを食わせるのが面倒なのでtry-catch
+        try {
+            actualUrl = await tracer(url);
+        }
+        catch (e) {
+            actualUrl = url;
+        }
+    }
+    const _url = URL.parse(actualUrl, true);
+    // Find matching plugin
+    const match = plugins.filter(plugin => plugin.test(_url))[0];
+    // Get summary
+    const summary = await (match ? match.summarize : general)(_url, opts.lang || undefined);
+    if (summary == null) {
+        throw 'failed summarize';
+    }
+    return Object.assign(summary, {
+        url: actualUrl
+    });
+};
+export default function (fastify, options, done) {
+    fastify.get('/url', async (req, reply) => {
+        const url = req.query.url;
+        if (url == null) {
+            return reply.status(400).send({
+                error: 'url is required'
+            });
+        }
+        try {
+            const summary = await summaly(url, {
+                lang: req.query.lang,
+                followRedirects: false,
+                ...options,
+            });
+            return summary;
+        }
+        catch (e) {
+            return reply.status(500).send({
+                error: e
+            });
+        }
+    });
+    done();
+}
diff --git a/built/iplugin.d.ts b/built/iplugin.d.ts
new file mode 100644
index 0000000..ba5028b
--- /dev/null
+++ b/built/iplugin.d.ts
@@ -0,0 +1,7 @@
+/// <reference types="node" />
+import * as URL from 'node:url';
+import Summary from './summary.js';
+export interface IPlugin {
+    test: (url: URL.Url) => boolean;
+    summarize: (url: URL.Url, lang?: string) => Promise<Summary>;
+}
diff --git a/built/iplugin.js b/built/iplugin.js
new file mode 100644
index 0000000..cb0ff5c
--- /dev/null
+++ b/built/iplugin.js
@@ -0,0 +1 @@
+export {};
diff --git a/built/plugins/amazon.d.ts b/built/plugins/amazon.d.ts
new file mode 100644
index 0000000..04a2d3d
--- /dev/null
+++ b/built/plugins/amazon.d.ts
@@ -0,0 +1,5 @@
+/// <reference types="node" />
+import * as URL from 'node:url';
+import summary from '../summary.js';
+export declare function test(url: URL.Url): boolean;
+export declare function summarize(url: URL.Url): Promise<summary>;
diff --git a/built/plugins/amazon.js b/built/plugins/amazon.js
new file mode 100644
index 0000000..3d329d9
--- /dev/null
+++ b/built/plugins/amazon.js
@@ -0,0 +1,43 @@
+import { scpaping } from '../utils/got.js';
+export function test(url) {
+    return url.hostname === 'www.amazon.com' ||
+        url.hostname === 'www.amazon.co.jp' ||
+        url.hostname === 'www.amazon.ca' ||
+        url.hostname === 'www.amazon.com.br' ||
+        url.hostname === 'www.amazon.com.mx' ||
+        url.hostname === 'www.amazon.co.uk' ||
+        url.hostname === 'www.amazon.de' ||
+        url.hostname === 'www.amazon.fr' ||
+        url.hostname === 'www.amazon.it' ||
+        url.hostname === 'www.amazon.es' ||
+        url.hostname === 'www.amazon.nl' ||
+        url.hostname === 'www.amazon.cn' ||
+        url.hostname === 'www.amazon.in' ||
+        url.hostname === 'www.amazon.au';
+}
+export async function summarize(url) {
+    const res = await scpaping(url.href);
+    const $ = res.$;
+    const title = $('#title').text();
+    const description = $('#productDescription').text() ||
+        $('meta[name="description"]').attr('content');
+    const thumbnail = $('#landingImage').attr('src');
+    const playerUrl = $('meta[property="twitter:player"]').attr('content') ||
+        $('meta[name="twitter:player"]').attr('content');
+    const playerWidth = $('meta[property="twitter:player:width"]').attr('content') ||
+        $('meta[name="twitter:player:width"]').attr('content');
+    const playerHeight = $('meta[property="twitter:player:height"]').attr('content') ||
+        $('meta[name="twitter:player:height"]').attr('content');
+    return {
+        title: title ? title.trim() : null,
+        icon: 'https://www.amazon.com/favicon.ico',
+        description: description ? description.trim() : null,
+        thumbnail: thumbnail ? thumbnail.trim() : null,
+        player: {
+            url: playerUrl || null,
+            width: playerWidth ? parseInt(playerWidth) : null,
+            height: playerHeight ? parseInt(playerHeight) : null
+        },
+        sitename: 'Amazon'
+    };
+}
diff --git a/built/plugins/index.d.ts b/built/plugins/index.d.ts
new file mode 100644
index 0000000..780a2ad
--- /dev/null
+++ b/built/plugins/index.d.ts
@@ -0,0 +1,2 @@
+import { IPlugin } from '@/iplugin.js';
+export declare const plugins: IPlugin[];
diff --git a/built/plugins/index.js b/built/plugins/index.js
new file mode 100644
index 0000000..13de039
--- /dev/null
+++ b/built/plugins/index.js
@@ -0,0 +1,6 @@
+import * as amazon from './amazon.js';
+import * as wikipedia from './wikipedia.js';
+export const plugins = [
+    amazon,
+    wikipedia,
+];
diff --git a/built/plugins/wikipedia.d.ts b/built/plugins/wikipedia.d.ts
new file mode 100644
index 0000000..04a2d3d
--- /dev/null
+++ b/built/plugins/wikipedia.d.ts
@@ -0,0 +1,5 @@
+/// <reference types="node" />
+import * as URL from 'node:url';
+import summary from '../summary.js';
+export declare function test(url: URL.Url): boolean;
+export declare function summarize(url: URL.Url): Promise<summary>;
diff --git a/built/plugins/wikipedia.js b/built/plugins/wikipedia.js
new file mode 100644
index 0000000..bb38703
--- /dev/null
+++ b/built/plugins/wikipedia.js
@@ -0,0 +1,36 @@
+import { get } from '../utils/got.js';
+import debug from 'debug';
+import clip from './../utils/clip.js';
+const log = debug('summaly:plugins:wikipedia');
+export function test(url) {
+    if (!url.hostname)
+        return false;
+    return /\.wikipedia\.org$/.test(url.hostname);
+}
+export async function summarize(url) {
+    const lang = url.host ? url.host.split('.')[0] : null;
+    const title = url.pathname ? url.pathname.split('/')[2] : null;
+    const endpoint = `https://${lang}.wikipedia.org/w/api.php?format=json&action=query&prop=extracts&exintro=&explaintext=&titles=${title}`;
+    log(`lang is ${lang}`);
+    log(`title is ${title}`);
+    log(`endpoint is ${endpoint}`);
+    let body = await get(endpoint);
+    body = JSON.parse(body);
+    log(body);
+    if (!('query' in body) || !('pages' in body.query)) {
+        throw 'fetch failed';
+    }
+    const info = body.query.pages[Object.keys(body.query.pages)[0]];
+    return {
+        title: info.title,
+        icon: 'https://wikipedia.org/static/favicon/wikipedia.ico',
+        description: clip(info.extract, 300),
+        thumbnail: `https://wikipedia.org/static/images/project-logos/${lang}wiki.png`,
+        player: {
+            url: null,
+            width: null,
+            height: null
+        },
+        sitename: 'Wikipedia'
+    };
+}
diff --git a/built/server/index.d.ts b/built/server/index.d.ts
new file mode 100644
index 0000000..cb0ff5c
--- /dev/null
+++ b/built/server/index.d.ts
@@ -0,0 +1 @@
+export {};
diff --git a/built/server/index.js b/built/server/index.js
new file mode 100644
index 0000000..e32567a
--- /dev/null
+++ b/built/server/index.js
@@ -0,0 +1,22 @@
+import * as http from 'http';
+import * as Koa from 'koa';
+import summaly from '../';
+const app = new Koa();
+app.use(async (ctx) => {
+    if (!ctx.query.url) {
+        ctx.status = 400;
+        return;
+    }
+    try {
+        const summary = await summaly(ctx.query.url, {
+            lang: ctx.query.lang,
+            followRedirects: false
+        });
+        ctx.body = summary;
+    }
+    catch (e) {
+        ctx.status = 500;
+    }
+});
+const server = http.createServer(app.callback());
+server.listen(process.env.PORT || 80);
diff --git a/built/summary.d.ts b/built/summary.d.ts
new file mode 100644
index 0000000..e343f80
--- /dev/null
+++ b/built/summary.d.ts
@@ -0,0 +1,45 @@
+declare type Summary = {
+    /**
+     * The description of that web page
+     */
+    description: string | null;
+    /**
+     * The url of the icon of that web page
+     */
+    icon: string | null;
+    /**
+     * The name of site of that web page
+     */
+    sitename: string | null;
+    /**
+     * The url of the thumbnail of that web page
+     */
+    thumbnail: string | null;
+    /**
+     * The player of that web page
+     */
+    player: Player;
+    /**
+     * The title of that web page
+     */
+    title: string | null;
+    /**
+     * Possibly sensitive
+     */
+    sensitive?: boolean;
+};
+export default Summary;
+export declare type Player = {
+    /**
+     * The url of the player
+     */
+    url: string | null;
+    /**
+     * The width of the player
+     */
+    width: number | null;
+    /**
+     * The height of the player
+     */
+    height: number | null;
+};
diff --git a/built/summary.js b/built/summary.js
new file mode 100644
index 0000000..cb0ff5c
--- /dev/null
+++ b/built/summary.js
@@ -0,0 +1 @@
+export {};
diff --git a/built/utils/cleanup-title.d.ts b/built/utils/cleanup-title.d.ts
new file mode 100644
index 0000000..a45a0d4
--- /dev/null
+++ b/built/utils/cleanup-title.d.ts
@@ -0,0 +1 @@
+export default function (title: string, siteName?: string | null): string;
diff --git a/built/utils/cleanup-title.js b/built/utils/cleanup-title.js
new file mode 100644
index 0000000..3855410
--- /dev/null
+++ b/built/utils/cleanup-title.js
@@ -0,0 +1,19 @@
+import escapeRegExp from 'escape-regexp';
+export default function (title, siteName) {
+    title = title.trim();
+    if (siteName) {
+        siteName = siteName.trim();
+        const x = escapeRegExp(siteName);
+        const patterns = [
+            `^(.+?)\\s?[\\-\\|:・]\\s?${x}$`
+        ];
+        for (let i = 0; i < patterns.length; i++) {
+            const pattern = new RegExp(patterns[i]);
+            const [, match] = pattern.exec(title) || [null, null];
+            if (match) {
+                return match;
+            }
+        }
+    }
+    return title;
+}
diff --git a/built/utils/clip.d.ts b/built/utils/clip.d.ts
new file mode 100644
index 0000000..ba0a174
--- /dev/null
+++ b/built/utils/clip.d.ts
@@ -0,0 +1 @@
+export default function (s: string, max: number): string;
diff --git a/built/utils/clip.js b/built/utils/clip.js
new file mode 100644
index 0000000..1e614ce
--- /dev/null
+++ b/built/utils/clip.js
@@ -0,0 +1,13 @@
+import nullOrEmpty from './null-or-empty.js';
+export default function (s, max) {
+    if (nullOrEmpty(s)) {
+        return s;
+    }
+    s = s.trim();
+    if (s.length > max) {
+        return s.substr(0, max) + '...';
+    }
+    else {
+        return s;
+    }
+}
diff --git a/built/utils/encoding.d.ts b/built/utils/encoding.d.ts
new file mode 100644
index 0000000..e9c4617
--- /dev/null
+++ b/built/utils/encoding.d.ts
@@ -0,0 +1,8 @@
+/// <reference types="node" />
+/**
+ * Detect HTML encoding
+ * @param body Body in Buffer
+ * @returns encoding
+ */
+export declare function detectEncoding(body: Buffer): string;
+export declare function toUtf8(body: Buffer, encoding: string): string;
diff --git a/built/utils/encoding.js b/built/utils/encoding.js
new file mode 100644
index 0000000..a8ee858
--- /dev/null
+++ b/built/utils/encoding.js
@@ -0,0 +1,40 @@
+import iconv from 'iconv-lite';
+import jschardet from 'jschardet';
+const regCharset = new RegExp(/charset\s*=\s*["']?([\w-]+)/, 'i');
+/**
+ * Detect HTML encoding
+ * @param body Body in Buffer
+ * @returns encoding
+ */
+export function detectEncoding(body) {
+    // By detection
+    const detected = jschardet.detect(body, { minimumThreshold: 0.99 });
+    if (detected) {
+        const candicate = detected.encoding;
+        const encoding = toEncoding(candicate);
+        if (encoding != null)
+            return encoding;
+    }
+    // From meta
+    const matchMeta = body.toString('ascii').match(regCharset);
+    if (matchMeta) {
+        const candicate = matchMeta[1];
+        const encoding = toEncoding(candicate);
+        if (encoding != null)
+            return encoding;
+    }
+    return 'utf-8';
+}
+export function toUtf8(body, encoding) {
+    return iconv.decode(body, encoding);
+}
+function toEncoding(candicate) {
+    if (iconv.encodingExists(candicate)) {
+        if (['shift_jis', 'shift-jis', 'windows-31j', 'x-sjis'].includes(candicate.toLowerCase()))
+            return 'cp932';
+        return candicate;
+    }
+    else {
+        return null;
+    }
+}
diff --git a/built/utils/got.d.ts b/built/utils/got.d.ts
new file mode 100644
index 0000000..9b70686
--- /dev/null
+++ b/built/utils/got.d.ts
@@ -0,0 +1,20 @@
+import * as Got from 'got';
+import * as cheerio from 'cheerio';
+export declare let agent: Got.Agents;
+export declare function setAgent(_agent: Got.Agents): void;
+export declare type GotOptions = {
+    url: string;
+    method: 'GET' | 'POST' | 'HEAD';
+    body?: string;
+    headers: Record<string, string | undefined>;
+    typeFilter?: RegExp;
+};
+export declare function scpaping(url: string, opts?: {
+    lang?: string;
+}): Promise<{
+    body: string;
+    $: cheerio.CheerioAPI;
+    response: Got.Response<string>;
+}>;
+export declare function get(url: string): Promise<string>;
+export declare function head(url: string): Promise<Got.Response<string>>;
diff --git a/built/utils/got.js b/built/utils/got.js
new file mode 100644
index 0000000..f2f73bc
--- /dev/null
+++ b/built/utils/got.js
@@ -0,0 +1,123 @@
+import got, * as Got from 'got';
+import { StatusError } from './status-error.js';
+import { detectEncoding, toUtf8 } from './encoding.js';
+import * as cheerio from 'cheerio';
+import PrivateIp from 'private-ip';
+import { dirname } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { readFileSync } from 'node:fs';
+const _filename = fileURLToPath(import.meta.url);
+const _dirname = dirname(_filename);
+export let agent = {};
+export function setAgent(_agent) {
+    agent = _agent || {};
+}
+const repo = JSON.parse(readFileSync(`${_dirname}/../../package.json`, 'utf8'));
+const RESPONSE_TIMEOUT = 20 * 1000;
+const OPERATION_TIMEOUT = 60 * 1000;
+const MAX_RESPONSE_SIZE = 10 * 1024 * 1024;
+const BOT_UA = `SummalyBot/${repo.version}`;
+export async function scpaping(url, opts) {
+    const response = await getResponse({
+        url,
+        method: 'GET',
+        headers: {
+            'accept': 'text/html,application/xhtml+xml',
+            'user-agent': BOT_UA,
+            'accept-language': opts?.lang
+        },
+        typeFilter: /^(text\/html|application\/xhtml\+xml)/,
+    });
+    // テスト用
+    const allowPrivateIp = process.env.SUMMALY_ALLOW_PRIVATE_IP === 'true';
+    if (!allowPrivateIp && response.ip && PrivateIp(response.ip)) {
+        throw new StatusError(`Private IP rejected ${response.ip}`, 400, 'Private IP Rejected');
+    }
+    const encoding = detectEncoding(response.rawBody);
+    const body = toUtf8(response.rawBody, encoding);
+    const $ = cheerio.load(body);
+    return {
+        body,
+        $,
+        response,
+    };
+}
+export async function get(url) {
+    const res = await getResponse({
+        url,
+        method: 'GET',
+        headers: {
+            'accept': '*/*',
+        },
+    });
+    return await res.body;
+}
+export async function head(url) {
+    const res = await getResponse({
+        url,
+        method: 'HEAD',
+        headers: {
+            'accept': '*/*',
+        },
+    });
+    return await res;
+}
+async function getResponse(args) {
+    const timeout = RESPONSE_TIMEOUT;
+    const operationTimeout = OPERATION_TIMEOUT;
+    const req = got(args.url, {
+        method: args.method,
+        headers: args.headers,
+        body: args.body,
+        timeout: {
+            lookup: timeout,
+            connect: timeout,
+            secureConnect: timeout,
+            socket: timeout,
+            response: timeout,
+            send: timeout,
+            request: operationTimeout, // whole operation timeout
+        },
+        agent,
+        http2: false,
+        retry: {
+            limit: 0,
+        },
+    });
+    return await receiveResponce({ req, typeFilter: args.typeFilter });
+}
+async function receiveResponce(args) {
+    const req = args.req;
+    const maxSize = MAX_RESPONSE_SIZE;
+    req.on('response', (res) => {
+        // Check html
+        if (args.typeFilter && !res.headers['content-type']?.match(args.typeFilter)) {
+            req.cancel(`Rejected by type filter ${res.headers['content-type']}`);
+            return;
+        }
+        // 応答ヘッダでサイズチェック
+        const contentLength = res.headers['content-length'];
+        if (contentLength != null) {
+            const size = Number(contentLength);
+            if (size > maxSize) {
+                req.cancel(`maxSize exceeded (${size} > ${maxSize}) on response`);
+            }
+        }
+    });
+    // 受信中のデータでサイズチェック
+    req.on('downloadProgress', (progress) => {
+        if (progress.transferred > maxSize && progress.percent !== 1) {
+            req.cancel(`maxSize exceeded (${progress.transferred} > ${maxSize}) on response`);
+        }
+    });
+    // 応答取得 with ステータスコードエラーの整形
+    const res = await req.catch(e => {
+        if (e instanceof Got.HTTPError) {
+            throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`, e.response.statusCode, e.response.statusMessage);
+        }
+        else {
+            throw e;
+        }
+    });
+    return res;
+}
diff --git a/built/utils/null-or-empty.d.ts b/built/utils/null-or-empty.d.ts
new file mode 100644
index 0000000..d19ff5c
--- /dev/null
+++ b/built/utils/null-or-empty.d.ts
@@ -0,0 +1 @@
+export default function (val: string): boolean;
diff --git a/built/utils/null-or-empty.js b/built/utils/null-or-empty.js
new file mode 100644
index 0000000..078e6a3
--- /dev/null
+++ b/built/utils/null-or-empty.js
@@ -0,0 +1,14 @@
+export default function (val) {
+    if (val === undefined) {
+        return true;
+    }
+    else if (val === null) {
+        return true;
+    }
+    else if (val.trim() === '') {
+        return true;
+    }
+    else {
+        return false;
+    }
+}
diff --git a/built/utils/status-error.d.ts b/built/utils/status-error.d.ts
new file mode 100644
index 0000000..fe06108
--- /dev/null
+++ b/built/utils/status-error.d.ts
@@ -0,0 +1,6 @@
+export declare class StatusError extends Error {
+    statusCode: number;
+    statusMessage?: string;
+    isPermanentError: boolean;
+    constructor(message: string, statusCode: number, statusMessage?: string);
+}
diff --git a/built/utils/status-error.js b/built/utils/status-error.js
new file mode 100644
index 0000000..d394e0c
--- /dev/null
+++ b/built/utils/status-error.js
@@ -0,0 +1,9 @@
+export class StatusError extends Error {
+    constructor(message, statusCode, statusMessage) {
+        super(message);
+        this.name = 'StatusError';
+        this.statusCode = statusCode;
+        this.statusMessage = statusMessage;
+        this.isPermanentError = typeof this.statusCode === 'number' && this.statusCode >= 400 && this.statusCode < 500;
+    }
+}
diff --git a/package.json b/package.json
index 53c4125..5a278bc 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "summaly",
-  "version": "3.0.0-alpha.1",
+  "version": "3.0.1",
   "description": "Get web page's summary",
   "author": "syuilo <syuilotan@yahoo.co.jp>",
   "license": "MIT",