diff --git a/packages/backend/package.json b/packages/backend/package.json
index 6cac949ea..586b95f2e 100644
--- a/packages/backend/package.json
+++ b/packages/backend/package.json
@@ -63,7 +63,7 @@
 		"file-type": "18.2.0",
 		"fluent-ffmpeg": "2.1.2",
 		"form-data": "^4.0.0",
-		"got": "12.5.3",
+		"got": "^12.5.3",
 		"hpagent": "1.2.0",
 		"ioredis": "4.28.5",
 		"ip-cidr": "3.0.11",
@@ -119,7 +119,6 @@
 		"typeorm": "0.3.11",
 		"typescript": "4.9.4",
 		"ulid": "2.3.0",
-		"undici": "^5.16.0",
 		"unzipper": "0.10.11",
 		"uuid": "9.0.0",
 		"vary": "1.1.2",
diff --git a/packages/backend/src/core/CaptchaService.ts b/packages/backend/src/core/CaptchaService.ts
index 1e9891405..c8428a26b 100644
--- a/packages/backend/src/core/CaptchaService.ts
+++ b/packages/backend/src/core/CaptchaService.ts
@@ -21,18 +21,13 @@ export class CaptchaService {
 			response,
 		});
 	
-		const res = await this.httpRequestService.fetch(
-			url,
-			{
-				method: 'POST',
-				body: params,
+		const res = await this.httpRequestService.send(url, {
+			method: 'POST',
+			body: JSON.stringify(params),
+			headers: {
+				'Content-Type': 'application/json',
 			},
-			{
-				noOkError: true,
-			}
-		).catch(err => {
-			throw `${err.message ?? err}`;
-		});
+		}, { throwErrorWhenResponseNotOk: false });
 	
 		if (!res.ok) {
 			throw `${res.status}`;
diff --git a/packages/backend/src/core/DownloadService.ts b/packages/backend/src/core/DownloadService.ts
index c5b2bcaef..a971e06fd 100644
--- a/packages/backend/src/core/DownloadService.ts
+++ b/packages/backend/src/core/DownloadService.ts
@@ -5,10 +5,10 @@ import { Inject, Injectable } from '@nestjs/common';
 import IPCIDR from 'ip-cidr';
 import PrivateIp from 'private-ip';
 import chalk from 'chalk';
-import { buildConnector } from 'undici';
+import got, * as Got from 'got';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
-import { HttpRequestService, UndiciFetcher } from '@/core/HttpRequestService.js';
+import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { createTemp } from '@/misc/create-temp.js';
 import { StatusError } from '@/misc/status-error.js';
 import { LoggerService } from '@/core/LoggerService.js';
@@ -20,7 +20,6 @@ import { bindThis } from '@/decorators.js';
 @Injectable()
 export class DownloadService {
 	private logger: Logger;
-	private undiciFetcher: UndiciFetcher;
 
 	constructor(
 		@Inject(DI.config)
@@ -30,21 +29,6 @@ export class DownloadService {
 		private loggerService: LoggerService,
 	) {
 		this.logger = this.loggerService.getLogger('download');
-
-		this.undiciFetcher = this.httpRequestService.createFetcher({
-			connect: process.env.NODE_ENV === 'development' ?
-				this.httpRequestService.clientDefaults.connect
-				:
-				this.httpRequestService.getConnectorWithIpCheck(
-					buildConnector({
-						...this.httpRequestService.clientDefaults.connect,
-					}),
-					(ip) => !this.isPrivateIp(ip),
-				),
-			bodyTimeout: 30 * 1000,
-		}, {
-			connect: this.httpRequestService.clientDefaults.connect,
-		}, this.logger);
 	}
 
 	@bindThis
@@ -55,14 +39,60 @@ export class DownloadService {
 		const operationTimeout = 60 * 1000;
 		const maxSize = this.config.maxFileSize ?? 262144000;
 
-		const response = await this.undiciFetcher.fetch(url);
+		const req = got.stream(url, {
+			headers: {
+				'User-Agent': this.config.userAgent,
+			},
+			timeout: {
+				lookup: timeout,
+				connect: timeout,
+				secureConnect: timeout,
+				socket: timeout,	// read timeout
+				response: timeout,
+				send: timeout,
+				request: operationTimeout,	// whole operation timeout
+			},
+			agent: {
+				http: this.httpRequestService.httpAgent,
+				https: this.httpRequestService.httpsAgent,
+			},
+			http2: false,	// default
+			retry: {
+				limit: 0,
+			},
+		}).on('response', (res: Got.Response) => {
+			if ((process.env.NODE_ENV === 'production' || process.env.NODE_ENV === 'test') && !this.config.proxy && res.ip) {
+				if (this.isPrivateIp(res.ip)) {
+					this.logger.warn(`Blocked address: ${res.ip}`);
+					req.destroy();
+				}
+			}
 
-		if (response.body === null) {
-			throw new StatusError('No body', 400, 'No body');
+			const contentLength = res.headers['content-length'];
+			if (contentLength != null) {
+				const size = Number(contentLength);
+				if (size > maxSize) {
+					this.logger.warn(`maxSize exceeded (${size} > ${maxSize}) on response`);
+					req.destroy();
+				}
+			}
+		}).on('downloadProgress', (progress: Got.Progress) => {
+			if (progress.transferred > maxSize) {
+				this.logger.warn(`maxSize exceeded (${progress.transferred} > ${maxSize}) on downloadProgress`);
+				req.destroy();
+			}
+		});
+
+		try {
+			await pipeline(req, fs.createWriteStream(path));
+		} catch (e) {
+			if (e instanceof Got.HTTPError) {
+				throw new StatusError(`${e.response.statusCode} ${e.response.statusMessage}`, e.response.statusCode, e.response.statusMessage);
+			} else {
+				throw e;
+			}
 		}
 
-		await pipeline(stream.Readable.fromWeb(response.body), fs.createWriteStream(path));
-
 		this.logger.succ(`Download finished: ${chalk.cyan(url)}`);
 	}
 
diff --git a/packages/backend/src/core/FetchInstanceMetadataService.ts b/packages/backend/src/core/FetchInstanceMetadataService.ts
index cb9d099a2..35f30deeb 100644
--- a/packages/backend/src/core/FetchInstanceMetadataService.ts
+++ b/packages/backend/src/core/FetchInstanceMetadataService.ts
@@ -2,6 +2,7 @@ import { URL } from 'node:url';
 import { Inject, Injectable } from '@nestjs/common';
 import { JSDOM } from 'jsdom';
 import tinycolor from 'tinycolor2';
+import fetch from 'node-fetch';
 import type { Instance } from '@/models/entities/Instance.js';
 import type { InstancesRepository } from '@/models/index.js';
 import { AppLockService } from '@/core/AppLockService.js';
@@ -190,7 +191,9 @@ export class FetchInstanceMetadataService {
 	
 		const faviconUrl = url + '/favicon.ico';
 	
-		const favicon = await this.httpRequestService.fetch(faviconUrl, {}, { noOkError: true });
+		const favicon = await this.httpRequestService.send(faviconUrl, {
+			method: 'HEAD',
+		}, { throwErrorWhenResponseNotOk: false });
 	
 		if (favicon.ok) {
 			return faviconUrl;
diff --git a/packages/backend/src/core/HttpRequestService.ts b/packages/backend/src/core/HttpRequestService.ts
index cd859d002..baf74acfa 100644
--- a/packages/backend/src/core/HttpRequestService.ts
+++ b/packages/backend/src/core/HttpRequestService.ts
@@ -1,284 +1,67 @@
 import * as http from 'node:http';
 import * as https from 'node:https';
-import { LookupFunction } from 'node:net';
 import CacheableLookup from 'cacheable-lookup';
+import fetch from 'node-fetch';
 import { HttpProxyAgent, HttpsProxyAgent } from 'hpagent';
 import { Inject, Injectable } from '@nestjs/common';
-import * as undici from 'undici';
 import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import { StatusError } from '@/misc/status-error.js';
 import { bindThis } from '@/decorators.js';
-import { LoggerService } from '@/core/LoggerService.js';
-import type Logger from '@/logger.js';
-
-// true to allow, false to deny
-export type IpChecker = (ip: string) => boolean;
-
-/* 
- *  Child class to create and save Agent for fetch.
- *  You should construct this when you want
- *  to change timeout, size limit, socket connect function, etc.
- */
-export class UndiciFetcher {
-	/**
-	 * Get http non-proxy agent (undici)
-	 */
-	public nonProxiedAgent: undici.Agent;
-
-	/**
-	 * Get http proxy or non-proxy agent (undici)
-	 */
-	public agent: undici.ProxyAgent | undici.Agent;
-
-	private proxyBypassHosts: string[];
-	private userAgent: string | undefined;
-
-	private logger: Logger | undefined;
-
-	constructor(
-		args: {
-			agentOptions: undici.Agent.Options;
-			proxy?: {
-				uri: string;
-				options?: undici.Agent.Options; // Override of agentOptions
-			},
-			proxyBypassHosts?: string[];
-			userAgent?: string;
-		},
-		logger?: Logger,
-	) {
-		this.logger = logger;
-		this.logger?.debug('UndiciFetcher constructor', args);
-
-		this.proxyBypassHosts = args.proxyBypassHosts ?? [];
-		this.userAgent = args.userAgent;
-
-		this.nonProxiedAgent = new undici.Agent({
-			...args.agentOptions,
-			connect: (process.env.NODE_ENV !== 'production' && typeof args.agentOptions.connect !== 'function')
-				? (options, cb) => {
-					// Custom connector for debug
-					undici.buildConnector(args.agentOptions.connect as undici.buildConnector.BuildOptions)(options, (err, socket) => {
-						this.logger?.debug('Socket connector called', socket);
-						if (err) {
-							this.logger?.debug('Socket error', err);
-							cb(new Error(`Error while socket connecting\n${err}`), null);
-							return;
-						}
-						this.logger?.debug(`Socket connected: port ${socket.localPort} => remote ${socket.remoteAddress}`);
-						cb(null, socket);
-					});
-				} : args.agentOptions.connect,
-		});
-
-		this.agent = args.proxy
-			? new undici.ProxyAgent({
-				...args.agentOptions,
-				...args.proxy.options,
-
-				uri: args.proxy.uri,
-
-				connect: (process.env.NODE_ENV !== 'production' && typeof (args.proxy.options?.connect ?? args.agentOptions.connect) !== 'function')
-					? (options, cb) => {
-						// Custom connector for debug
-						undici.buildConnector((args.proxy?.options?.connect ?? args.agentOptions.connect) as undici.buildConnector.BuildOptions)(options, (err, socket) => {
-							this.logger?.debug('Socket connector called (secure)', socket);
-							if (err) {
-								this.logger?.debug('Socket error', err);
-								cb(new Error(`Error while socket connecting\n${err}`), null);
-								return;
-							}
-							this.logger?.debug(`Socket connected (secure): port ${socket.localPort} => remote ${socket.remoteAddress}`);
-							cb(null, socket);
-						});
-					} : (args.proxy.options?.connect ?? args.agentOptions.connect),
-			})
-			: this.nonProxiedAgent;
-	}
-
-	/**
-	 * Get agent by URL
-	 * @param url URL
-	 * @param bypassProxy Allways bypass proxy
-	 */
-	@bindThis
-	public getAgentByUrl(url: URL, bypassProxy = false): undici.Agent | undici.ProxyAgent {
-		if (bypassProxy || this.proxyBypassHosts.includes(url.hostname)) {
-			return this.nonProxiedAgent;
-		} else {
-			return this.agent;
-		}
-	}
-
-	@bindThis
-	public async fetch(
-		url: string | URL,
-		options: undici.RequestInit = {},
-		privateOptions: { noOkError?: boolean; bypassProxy?: boolean; } = { noOkError: false, bypassProxy: false },
-	): Promise<undici.Response> {
-		const res = await undici.fetch(url, {
-			dispatcher: this.getAgentByUrl(new URL(url), privateOptions.bypassProxy),
-			...options,
-			headers: {
-				'User-Agent': this.userAgent ?? '',
-				...(options.headers ?? {}),
-			},
-		}).catch((err) => {
-			this.logger?.error(`fetch error to ${typeof url === 'string' ? url : url.href}`, err);
-			throw new StatusError('Resource Unreachable', 500, 'Resource Unreachable');
-		});
-		if (!res.ok && !privateOptions.noOkError) {
-			throw new StatusError(`${res.status} ${res.statusText}`, res.status, res.statusText);
-		}
-		return res;
-	}
-
-	@bindThis
-	public async request(
-		url: string | URL,
-		options: { dispatcher?: undici.Dispatcher } & Omit<undici.Dispatcher.RequestOptions, 'origin' | 'path' | 'method'> & Partial<Pick<undici.Dispatcher.RequestOptions, 'method'>> = {},
-		privateOptions: { noOkError?: boolean; bypassProxy?: boolean; } = { noOkError: false, bypassProxy: false },
-	): Promise<undici.Dispatcher.ResponseData> {
-		const res = await undici.request(url, {
-			dispatcher: this.getAgentByUrl(new URL(url), privateOptions.bypassProxy),
-			...options,
-			headers: {
-				'user-agent': this.userAgent ?? '',
-				...(options.headers ?? {}),
-			},
-		}).catch((err) => {
-			this.logger?.error(`fetch error to ${typeof url === 'string' ? url : url.href}`, err);
-			throw new StatusError('Resource Unreachable', 500, 'Resource Unreachable');
-		});
-
-		if (res.statusCode >= 400) {
-			throw new StatusError(`${res.statusCode}`, res.statusCode, '');
-		}
-
-		return res;
-	}
-
-	@bindThis
-	public async getJson<T extends unknown>(url: string, accept = 'application/json, */*', headers?: Record<string, string>): Promise<T> {
-		const { body } = await this.request( 
-			url,
-			{
-				headers: Object.assign({
-					Accept: accept,
-				}, headers ?? {}),
-			},
-		);
-
-		return await body.json() as T;
-	}
-
-	@bindThis
-	public async getHtml(url: string, accept = 'text/html, */*', headers?: Record<string, string>): Promise<string> {
-		const { body } = await this.request(
-			url,
-			{
-				headers: Object.assign({
-					Accept: accept,
-				}, headers ?? {}),
-			},
-		);
-
-		return await body.text();
-	}
-}
+import type { Response } from 'node-fetch';
+import type { URL } from 'node:url';
 
 @Injectable()
 export class HttpRequestService {
-	public defaultFetcher: UndiciFetcher;
-	public fetch: UndiciFetcher['fetch'];
-	public request: UndiciFetcher['request'];
-	public getHtml: UndiciFetcher['getHtml'];
-	public defaultJsonFetcher: UndiciFetcher;
-	public getJson: UndiciFetcher['getJson'];
-
-	//#region for old http/https, only used in S3Service
-	// http non-proxy agent
+	/**
+	 * Get http non-proxy agent
+	 */
 	private http: http.Agent;
 
-	// https non-proxy agent
+	/**
+	 * Get https non-proxy agent
+	 */
 	private https: https.Agent;
 
-	// http proxy or non-proxy agent
+	/**
+	 * Get http proxy or non-proxy agent
+	 */
 	public httpAgent: http.Agent;
 
-	// https proxy or non-proxy agent
+	/**
+	 * Get https proxy or non-proxy agent
+	 */
 	public httpsAgent: https.Agent;
-	//#endregion
-
-	public readonly dnsCache: CacheableLookup;
-	public readonly clientDefaults: undici.Agent.Options;
-	private maxSockets: number;
-
-	private logger: Logger;
 
 	constructor(
 		@Inject(DI.config)
 		private config: Config,
-		private loggerService: LoggerService,
 	) {
-		this.logger = this.loggerService.getLogger('http-request');
-
-		this.dnsCache = new CacheableLookup({
+		const cache = new CacheableLookup({
 			maxTtl: 3600,	// 1hours
 			errorTtl: 30,	// 30secs
 			lookup: false,	// nativeのdns.lookupにfallbackしない
 		});
-
-		this.clientDefaults = {
-			keepAliveTimeout: 30 * 1000,
-			keepAliveMaxTimeout: 10 * 60 * 1000,
-			keepAliveTimeoutThreshold: 1 * 1000,
-			strictContentLength: true,
-			headersTimeout: 10 * 1000,
-			bodyTimeout: 10 * 1000,
-			maxHeaderSize: 16364, // default
-			maxResponseSize: 10 * 1024 * 1024,
-			maxRedirections: 3,
-			connect: {
-				timeout: 10 * 1000, // コネクションが確立するまでのタイムアウト
-				maxCachedSessions: 300, // TLSセッションのキャッシュ数 https://github.com/nodejs/undici/blob/v5.14.0/lib/core/connect.js#L80
-				lookup: this.dnsCache.lookup as LookupFunction, // https://github.com/nodejs/undici/blob/v5.14.0/lib/core/connect.js#L98
-			},
-		};
-
-		this.maxSockets = Math.max(64, ((this.config.deliverJobConcurrency ?? 128) / (this.config.clusterLimit ?? 1)));
-
-		this.defaultFetcher = this.createFetcher({}, {}, this.logger);
-
-		this.fetch = this.defaultFetcher.fetch;
-		this.request = this.defaultFetcher.request;
-		this.getHtml = this.defaultFetcher.getHtml;
-
-		this.defaultJsonFetcher = this.createFetcher({
-			maxResponseSize: 1024 * 256,
-		}, {}, this.logger);
-
-		this.getJson = this.defaultJsonFetcher.getJson;
-
-		//#region for old http/https, only used in S3Service
+		
 		this.http = new http.Agent({
 			keepAlive: true,
 			keepAliveMsecs: 30 * 1000,
-			lookup: this.dnsCache.lookup,
+			lookup: cache.lookup,
 		} as http.AgentOptions);
 		
 		this.https = new https.Agent({
 			keepAlive: true,
 			keepAliveMsecs: 30 * 1000,
-			lookup: this.dnsCache.lookup,
+			lookup: cache.lookup,
 		} as https.AgentOptions);
-
+		
+		const maxSockets = Math.max(256, config.deliverJobConcurrency ?? 128);
+		
 		this.httpAgent = config.proxy
 			? new HttpProxyAgent({
 				keepAlive: true,
 				keepAliveMsecs: 30 * 1000,
-				maxSockets: this.maxSockets,
+				maxSockets,
 				maxFreeSockets: 256,
 				scheduling: 'lifo',
 				proxy: config.proxy,
@@ -289,47 +72,21 @@ export class HttpRequestService {
 			? new HttpsProxyAgent({
 				keepAlive: true,
 				keepAliveMsecs: 30 * 1000,
-				maxSockets: this.maxSockets,
+				maxSockets,
 				maxFreeSockets: 256,
 				scheduling: 'lifo',
 				proxy: config.proxy,
 			})
 			: this.https;
-		//#endregion
-	}
-
-	@bindThis
-	private getStandardUndiciFetcherOption(opts: undici.Agent.Options = {}, proxyOpts: undici.Agent.Options = {}) {
-		return {
-			agentOptions: {
-				...this.clientDefaults,
-				...opts,
-			},
-			...(this.config.proxy ? {
-				proxy: {
-					uri: this.config.proxy,
-					options: {
-						connections: this.maxSockets,
-						...proxyOpts,
-					},
-				},
-			} : {}),
-			userAgent: this.config.userAgent,
-		};
-	}
-
-	@bindThis
-	public createFetcher(opts: undici.Agent.Options = {}, proxyOpts: undici.Agent.Options = {}, logger: Logger) {
-		return new UndiciFetcher(this.getStandardUndiciFetcherOption(opts, proxyOpts), logger);
 	}
 
 	/**
-	 * Get http agent by URL
+	 * Get agent by URL
 	 * @param url URL
 	 * @param bypassProxy Allways bypass proxy
 	 */
 	@bindThis
-	public getHttpAgentByUrl(url: URL, bypassProxy = false): http.Agent | https.Agent {
+	public getAgentByUrl(url: URL, bypassProxy = false): http.Agent | https.Agent {
 		if (bypassProxy || (this.config.proxyBypassHosts || []).includes(url.hostname)) {
 			return url.protocol === 'http:' ? this.http : this.https;
 		} else {
@@ -337,37 +94,67 @@ export class HttpRequestService {
 		}
 	}
 
-	/**
-	 * check ip
-	 */
 	@bindThis
-	public getConnectorWithIpCheck(connector: undici.buildConnector.connector, checkIp: IpChecker): undici.buildConnector.connectorAsync {
-		return (options, cb) => {
-			connector(options, (err, socket) => {
-				this.logger.debug('Socket connector (with ip checker) called', socket);
-				if (err) {
-					this.logger.error('Socket error', err);
-					cb(new Error(`Error while socket connecting\n${err}`), null);
-					return;
-				}
+	public async getJson(url: string, accept = 'application/json, */*', headers?: Record<string, string>): Promise<unknown> {
+		const res = await this.send(url, {
+			method: 'GET',
+			headers: Object.assign({
+				'User-Agent': this.config.userAgent,
+				Accept: accept,
+			}, headers ?? {}),
+			timeout: 5000,
+			size: 1024 * 256,
+		});
 
-				if (socket.remoteAddress == undefined) {
-					this.logger.error('Socket error: remoteAddress is undefined');
-					cb(new Error('remoteAddress is undefined (maybe socket destroyed)'), null);
-					return;
-				}
+		return await res.json();
+	}
 
-				// allow
-				if (checkIp(socket.remoteAddress)) {
-					this.logger.debug(`Socket connected (ip ok): ${socket.localPort} => ${socket.remoteAddress}`);
-					cb(null, socket);
-					return;
-				}
+	@bindThis
+	public async getHtml(url: string, accept = 'text/html, */*', headers?: Record<string, string>): Promise<string> {
+		const res = await this.send(url, {
+			method: 'GET',
+			headers: Object.assign({
+				'User-Agent': this.config.userAgent,
+				Accept: accept,
+			}, headers ?? {}),
+			timeout: 5000,
+		});
 
-				this.logger.error('IP is not allowed', socket);
-				cb(new StatusError('IP is not allowed', 403, 'IP is not allowed'), null);
-				socket.destroy();
-			});
-		};
+		return await res.text();
+	}
+
+	@bindThis
+	public async send(url: string, args: {
+		method?: string,
+		body?: string,
+		headers?: Record<string, string>,
+		timeout?: number,
+		size?: number,
+	} = {}, extra: {
+		throwErrorWhenResponseNotOk: boolean;
+	} = {
+		throwErrorWhenResponseNotOk: true,
+	}): Promise<Response> {
+		const timeout = args.timeout ?? 5000;
+
+		const controller = new AbortController();
+		setTimeout(() => {
+			controller.abort();
+		}, timeout);
+
+		const res = await fetch(url, {
+			method: args.method ?? 'GET',
+			headers: args.headers,
+			body: args.body,
+			size: args.size ?? 10 * 1024 * 1024,
+			agent: (url) => this.getAgentByUrl(url),
+			signal: controller.signal,
+		});
+
+		if (!res.ok && extra.throwErrorWhenResponseNotOk) {
+			throw new StatusError(`${res.status} ${res.statusText}`, res.status, res.statusText);
+		}
+
+		return res;
 	}
 }
diff --git a/packages/backend/src/core/S3Service.ts b/packages/backend/src/core/S3Service.ts
index 930188ce6..0ce69aaa7 100644
--- a/packages/backend/src/core/S3Service.ts
+++ b/packages/backend/src/core/S3Service.ts
@@ -33,7 +33,7 @@ export class S3Service {
 				? false
 				: meta.objectStorageS3ForcePathStyle,
 			httpOptions: {
-				agent: this.httpRequestService.getHttpAgentByUrl(new URL(u), !meta.objectStorageUseProxy),
+				agent: this.httpRequestService.getAgentByUrl(new URL(u), !meta.objectStorageUseProxy),
 			},
 		});
 	}
diff --git a/packages/backend/src/core/activitypub/ApRequestService.ts b/packages/backend/src/core/activitypub/ApRequestService.ts
index db87475c4..b949f3484 100644
--- a/packages/backend/src/core/activitypub/ApRequestService.ts
+++ b/packages/backend/src/core/activitypub/ApRequestService.ts
@@ -5,16 +5,14 @@ import { DI } from '@/di-symbols.js';
 import type { Config } from '@/config.js';
 import type { User } from '@/models/entities/User.js';
 import { UserKeypairStoreService } from '@/core/UserKeypairStoreService.js';
-import { HttpRequestService, UndiciFetcher } from '@/core/HttpRequestService.js';
+import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { LoggerService } from '@/core/LoggerService.js';
 import { bindThis } from '@/decorators.js';
 import type Logger from '@/logger.js';
-import type { Dispatcher } from 'undici';
-import { DevNull } from '@/misc/dev-null.js';
 
 type Request = {
 	url: string;
-	method: Dispatcher.HttpMethod;
+	method: string;
 	headers: Record<string, string>;
 };
 
@@ -32,7 +30,6 @@ type PrivateKey = {
 
 @Injectable()
 export class ApRequestService {
-	private undiciFetcher: UndiciFetcher;
 	private logger: Logger;
 
 	constructor(
@@ -44,9 +41,6 @@ export class ApRequestService {
 		private loggerService: LoggerService,
 	) {
 		this.logger = this.loggerService.getLogger('ap-request'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
-		this.undiciFetcher = this.httpRequestService.createFetcher({
-			maxRedirections: 0,
-		}, {}, this.logger);
 	}
 
 	@bindThis
@@ -165,15 +159,11 @@ export class ApRequestService {
 			},
 		});
 
-		const response = await this.undiciFetcher.request(
-			url,
-			{
-				method: req.request.method,
-				headers: req.request.headers,
-				body,
-			},
-		);
-		response.body.pipe(new DevNull());
+		await this.httpRequestService.send(url, {
+			method: req.request.method,
+			headers: req.request.headers,
+			body,
+		});
 	}
 
 	/**
@@ -195,13 +185,10 @@ export class ApRequestService {
 			},
 		});
 
-		const res = await this.httpRequestService.fetch(
-			url,
-			{
-				method: req.request.method,
-				headers: req.request.headers,
-			},
-		);
+		const res = await this.httpRequestService.send(url, {
+			method: req.request.method,
+			headers: req.request.headers,
+		});
 
 		return await res.json();
 	}
diff --git a/packages/backend/src/core/activitypub/ApResolverService.ts b/packages/backend/src/core/activitypub/ApResolverService.ts
index ca7760af8..8ead29a5f 100644
--- a/packages/backend/src/core/activitypub/ApResolverService.ts
+++ b/packages/backend/src/core/activitypub/ApResolverService.ts
@@ -4,7 +4,7 @@ import { InstanceActorService } from '@/core/InstanceActorService.js';
 import type { NotesRepository, PollsRepository, NoteReactionsRepository, UsersRepository } from '@/models/index.js';
 import type { Config } from '@/config.js';
 import { MetaService } from '@/core/MetaService.js';
-import { HttpRequestService, UndiciFetcher } from '@/core/HttpRequestService.js';
+import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { DI } from '@/di-symbols.js';
 import { UtilityService } from '@/core/UtilityService.js';
 import { bindThis } from '@/decorators.js';
@@ -19,7 +19,6 @@ import type { IObject, ICollection, IOrderedCollection } from './type.js';
 export class Resolver {
 	private history: Set<string>;
 	private user?: ILocalUser;
-	private undiciFetcher: UndiciFetcher;
 	private logger: Logger;
 
 	constructor(
@@ -39,10 +38,7 @@ export class Resolver {
 		private recursionLimit = 100,
 	) {
 		this.history = new Set();
-		this.logger = this.loggerService?.getLogger('ap-resolve'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
-		this.undiciFetcher = this.httpRequestService.createFetcher({
-			maxRedirections: 0,
-		}, {}, this.logger);
+		this.logger = this.loggerService.getLogger('ap-resolve'); // なぜか TypeError: Cannot read properties of undefined (reading 'getLogger') と言われる
 	}
 
 	@bindThis
@@ -106,7 +102,7 @@ export class Resolver {
 
 		const object = (this.user
 			? await this.apRequestService.signedGet(value, this.user) as IObject
-			: await this.undiciFetcher.getJson<IObject>(value, 'application/activity+json, application/ld+json'));
+			: await this.httpRequestService.getJson(value, 'application/activity+json, application/ld+json')) as IObject;
 
 		if (object == null || (
 			Array.isArray(object['@context']) ?
diff --git a/packages/backend/src/core/activitypub/LdSignatureService.ts b/packages/backend/src/core/activitypub/LdSignatureService.ts
index 4e4b7dce2..5a1e01574 100644
--- a/packages/backend/src/core/activitypub/LdSignatureService.ts
+++ b/packages/backend/src/core/activitypub/LdSignatureService.ts
@@ -9,7 +9,7 @@ import { CONTEXTS } from './misc/contexts.js';
 class LdSignature {
 	public debug = false;
 	public preLoad = true;
-	public loderTimeout = 10 * 1000;
+	public loderTimeout = 5000;
 
 	constructor(
 		private httpRequestService: HttpRequestService,
@@ -115,19 +115,12 @@ class LdSignature {
 
 	@bindThis
 	private async fetchDocument(url: string) {
-		const json = await this.httpRequestService.fetch(
-			url,
-			{
-				headers: {
-					Accept: 'application/ld+json, application/json',
-				},
-				// TODO
-				//timeout: this.loderTimeout,
+		const json = await this.httpRequestService.send(url, {
+			headers: {
+				Accept: 'application/ld+json, application/json',
 			},
-			{
-				noOkError: true,
-			}
-		).then(res => {
+			timeout: this.loderTimeout,
+		}, { throwErrorWhenResponseNotOk: false }).then(res => {
 			if (!res.ok) {
 				throw `${res.status} ${res.statusText}`;
 			} else {
diff --git a/packages/backend/src/queue/processors/WebhookDeliverProcessorService.ts b/packages/backend/src/queue/processors/WebhookDeliverProcessorService.ts
index f0543a5ed..57210b25d 100644
--- a/packages/backend/src/queue/processors/WebhookDeliverProcessorService.ts
+++ b/packages/backend/src/queue/processors/WebhookDeliverProcessorService.ts
@@ -6,10 +6,10 @@ import type { Config } from '@/config.js';
 import type Logger from '@/logger.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
 import { StatusError } from '@/misc/status-error.js';
+import { bindThis } from '@/decorators.js';
 import { QueueLoggerService } from '../QueueLoggerService.js';
 import type Bull from 'bull';
 import type { WebhookDeliverJobData } from '../types.js';
-import { bindThis } from '@/decorators.js';
 
 @Injectable()
 export class WebhookDeliverProcessorService {
@@ -33,26 +33,23 @@ export class WebhookDeliverProcessorService {
 		try {
 			this.logger.debug(`delivering ${job.data.webhookId}`);
 	
-			const res = await this.httpRequestService.fetch(
-				job.data.to,
-				{
-					method: 'POST',
-					headers: {
-						'User-Agent': 'Misskey-Hooks',
-						'X-Misskey-Host': this.config.host,
-						'X-Misskey-Hook-Id': job.data.webhookId,
-						'X-Misskey-Hook-Secret': job.data.secret,
-					},
-					body: JSON.stringify({
-						hookId: job.data.webhookId,
-						userId: job.data.userId,
-						eventId: job.data.eventId,
-						createdAt: job.data.createdAt,
-						type: job.data.type,
-						body: job.data.content,
-					}),
-				}
-			);
+			const res = await this.httpRequestService.send(job.data.to, {
+				method: 'POST',
+				headers: {
+					'User-Agent': 'Misskey-Hooks',
+					'X-Misskey-Host': this.config.host,
+					'X-Misskey-Hook-Id': job.data.webhookId,
+					'X-Misskey-Hook-Secret': job.data.secret,
+				},
+				body: JSON.stringify({
+					hookId: job.data.webhookId,
+					userId: job.data.userId,
+					eventId: job.data.eventId,
+					createdAt: job.data.createdAt,
+					type: job.data.type,
+					body: job.data.content,
+				}),
+			});
 	
 			this.webhooksRepository.update({ id: job.data.webhookId }, {
 				latestSentAt: new Date(),
diff --git a/packages/backend/src/server/api/endpoints/fetch-rss.ts b/packages/backend/src/server/api/endpoints/fetch-rss.ts
index ae6a87513..5849d3111 100644
--- a/packages/backend/src/server/api/endpoints/fetch-rss.ts
+++ b/packages/backend/src/server/api/endpoints/fetch-rss.ts
@@ -33,16 +33,13 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 		private httpRequestService: HttpRequestService,
 	) {
 		super(meta, paramDef, async (ps, me) => {
-			const res = await this.httpRequestService.fetch(
-				ps.url,
-				{
-					method: 'GET',
-					headers: {
-						Accept: 'application/rss+xml, */*',
-					},
-					// timeout: 5000,
-				}
-			);
+			const res = await this.httpRequestService.send(ps.url, {
+				method: 'GET',
+				headers: {
+					Accept: 'application/rss+xml, */*',
+				},
+				timeout: 5000,
+			});
 
 			const text = await res.text();
 
diff --git a/packages/backend/src/server/api/endpoints/notes/translate.ts b/packages/backend/src/server/api/endpoints/notes/translate.ts
index ab1977167..66655234a 100644
--- a/packages/backend/src/server/api/endpoints/notes/translate.ts
+++ b/packages/backend/src/server/api/endpoints/notes/translate.ts
@@ -7,8 +7,8 @@ import { DI } from '@/di-symbols.js';
 import { NoteEntityService } from '@/core/entities/NoteEntityService.js';
 import { MetaService } from '@/core/MetaService.js';
 import { HttpRequestService } from '@/core/HttpRequestService.js';
-import { ApiError } from '../../error.js';
 import { GetterService } from '@/server/api/GetterService.js';
+import { ApiError } from '../../error.js';
 
 export const meta = {
 	tags: ['notes'],
@@ -83,20 +83,14 @@ export default class extends Endpoint<typeof meta, typeof paramDef> {
 
 			const endpoint = instance.deeplIsPro ? 'https://api.deepl.com/v2/translate' : 'https://api-free.deepl.com/v2/translate';
 
-			const res = await this.httpRequestService.fetch(
-				endpoint,
-				{
-					method: 'POST',
-					headers: {
-						'Content-Type': 'application/x-www-form-urlencoded',
-						Accept: 'application/json, */*',
-					},
-					body: params.toString(),
+			const res = await this.httpRequestService.send(endpoint, {
+				method: 'POST',
+				headers: {
+					'Content-Type': 'application/x-www-form-urlencoded',
+					Accept: 'application/json, */*',
 				},
-				{
-					noOkError: false,
-				}
-			);
+				body: params.toString(),
+			});
 
 			const json = (await res.json()) as {
 				translations: {
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index 3fdaf1449..bfe98f9a8 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -142,7 +142,7 @@ importers:
       file-type: 18.2.0
       fluent-ffmpeg: 2.1.2
       form-data: ^4.0.0
-      got: 12.5.3
+      got: ^12.5.3
       hpagent: 1.2.0
       ioredis: 4.28.5
       ip-cidr: 3.0.11
@@ -201,7 +201,6 @@ importers:
       typeorm: 0.3.11
       typescript: 4.9.4
       ulid: 2.3.0
-      undici: ^5.16.0
       unzipper: 0.10.11
       uuid: 9.0.0
       vary: 1.1.2
@@ -306,7 +305,6 @@ importers:
       typeorm: 0.3.11_ioredis@4.28.5+pg@8.8.0
       typescript: 4.9.4
       ulid: 2.3.0
-      undici: 5.16.0
       unzipper: 0.10.11
       uuid: 9.0.0
       vary: 1.1.2