diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index a3263bf6aa..b155e4403b 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -185,7 +185,7 @@ TODO
 ## Environment Variable
 
 - `MISSKEY_CONFIG_YML`: Specify the file path of config.yml instead of default.yml (e.g. `2nd.yml`).
-- `MISSKEY_WEBFINGER_USE_HTTP`: If it's set true, WebFinger requests will be http instead of https, useful for testing federation between servers in localhost. NEVER USE IN PRODUCTION.
+- `MISSKEY_USE_HTTP`: If it's set true, federation requests (like nodeinfo and webfinger) will be http instead of https, useful for testing federation between servers in localhost. NEVER USE IN PRODUCTION. (was `MISSKEY_WEBFINGER_USE_HTTP`)
 
 ## Continuous integration
 Misskey uses GitHub Actions for executing automated tests.
diff --git a/packages/backend/src/core/FetchInstanceMetadataService.ts b/packages/backend/src/core/FetchInstanceMetadataService.ts
index 21e84a7454..fc4f335d54 100644
--- a/packages/backend/src/core/FetchInstanceMetadataService.ts
+++ b/packages/backend/src/core/FetchInstanceMetadataService.ts
@@ -50,7 +50,7 @@ export class FetchInstanceMetadataService {
 		private redisClient: Redis.Redis,
 	) {
 		this.logger = this.loggerService.getLogger('metadata', 'cyan');
-		this.httpColon = 'http://';
+		this.httpColon = process.env.MISSKEY_USE_HTTP?.toLowerCase() === 'true' ? 'http://' : 'https://';
 	}
 
 	@bindThis
diff --git a/packages/backend/src/core/WebfingerService.ts b/packages/backend/src/core/WebfingerService.ts
index 374536a741..aa1144778c 100644
--- a/packages/backend/src/core/WebfingerService.ts
+++ b/packages/backend/src/core/WebfingerService.ts
@@ -46,7 +46,7 @@ export class WebfingerService {
 		const m = query.match(mRegex);
 		if (m) {
 			const hostname = m[2];
-			const useHttp = process.env.MISSKEY_WEBFINGER_USE_HTTP && process.env.MISSKEY_WEBFINGER_USE_HTTP.toLowerCase() === 'true';
+			const useHttp = process.env.MISSKEY_USE_HTTP && process.env.MISSKEY_USE_HTTP.toLowerCase() === 'true';
 			return `http${useHttp ? '' : 's'}://${hostname}/.well-known/webfinger?${urlQuery({ resource: `acct:${query}` })}`;
 		}
 
diff --git a/packages/backend/src/core/activitypub/models/ApPersonService.ts b/packages/backend/src/core/activitypub/models/ApPersonService.ts
index da4a42f73e..000d1d4144 100644
--- a/packages/backend/src/core/activitypub/models/ApPersonService.ts
+++ b/packages/backend/src/core/activitypub/models/ApPersonService.ts
@@ -256,9 +256,11 @@ export class ApPersonService implements OnModuleInit {
 		// ついでにリモートユーザーの情報が古かったら更新しておく
 		if (this.userEntityService.isRemoteUser(exist)) {
 			if (exist.lastFetchedAt == null || Date.now() - exist.lastFetchedAt.getTime() > 1000 * 60 * 60 * 3) {
+				this.logger.debug('fetchPersonWithRenewal: renew', { uri, lastFetchedAt: exist.lastFetchedAt });
 				await this.updatePerson(exist.uri);
 				return await this.fetchPerson(uri);
 			}
+			this.logger.debug('fetchPersonWithRenewal: use cache', { uri, lastFetchedAt: exist.lastFetchedAt });
 		}
 
 		return exist;