diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/common/ActivityPubStringResponse.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/common/ActivityPubStringResponse.kt
deleted file mode 100644
index 60b58404..00000000
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/common/ActivityPubStringResponse.kt
+++ /dev/null
@@ -1,68 +0,0 @@
-package dev.usbharu.hideout.activitypub.interfaces.api.common
-
-import dev.usbharu.hideout.activitypub.domain.model.JsonLd
-import dev.usbharu.hideout.util.HttpUtil.Activity
-import io.ktor.http.*
-
-sealed class ActivityPubResponse(
-    val httpStatusCode: HttpStatusCode,
-    val contentType: ContentType = ContentType.Application.Activity
-) {
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (other !is ActivityPubResponse) return false
-
-        if (httpStatusCode != other.httpStatusCode) return false
-        if (contentType != other.contentType) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int {
-        var result = httpStatusCode.hashCode()
-        result = 31 * result + contentType.hashCode()
-        return result
-    }
-
-    override fun toString(): String = "ActivityPubResponse(httpStatusCode=$httpStatusCode, contentType=$contentType)"
-}
-
-class ActivityPubStringResponse(
-    httpStatusCode: HttpStatusCode = HttpStatusCode.OK,
-    val message: String,
-    contentType: ContentType = ContentType.Application.Activity
-) : ActivityPubResponse(httpStatusCode, contentType) {
-
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (other !is ActivityPubStringResponse) return false
-
-        if (message != other.message) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int = message.hashCode()
-
-    override fun toString(): String = "ActivityPubStringResponse(message='$message') ${super.toString()}"
-}
-
-class ActivityPubObjectResponse(
-    httpStatusCode: HttpStatusCode = HttpStatusCode.OK,
-    val message: JsonLd,
-    contentType: ContentType = ContentType.Application.Activity
-) : ActivityPubResponse(httpStatusCode, contentType) {
-    override fun equals(other: Any?): Boolean {
-        if (this === other) return true
-        if (other !is ActivityPubObjectResponse) return false
-
-        if (message != other.message) return false
-
-        return true
-    }
-
-    override fun hashCode(): Int = message.hashCode()
-
-    override fun toString(): String = "ActivityPubObjectResponse(message=$message) ${super.toString()}"
-}
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptService.kt
index 72c3f8c3..2e845715 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptService.kt
@@ -3,18 +3,15 @@ package dev.usbharu.hideout.activitypub.service.activity.accept
 import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObjectException
 import dev.usbharu.hideout.activitypub.domain.model.Accept
 import dev.usbharu.hideout.activitypub.domain.model.Follow
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.query.FollowerQueryService
 import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.hideout.core.service.user.UserService
-import io.ktor.http.*
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Service
 
 interface APAcceptService {
-    suspend fun receiveAccept(accept: Accept): ActivityPubResponse
+    suspend fun receiveAccept(accept: Accept)
 }
 
 @Service
@@ -24,7 +21,7 @@ class APAcceptServiceImpl(
     private val followerQueryService: FollowerQueryService,
     private val transaction: Transaction
 ) : APAcceptService {
-    override suspend fun receiveAccept(accept: Accept): ActivityPubResponse {
+    override suspend fun receiveAccept(accept: Accept) {
         return transaction.transaction {
             LOGGER.debug("START Follow")
             LOGGER.trace("{}", accept)
@@ -43,11 +40,11 @@ class APAcceptServiceImpl(
 
             if (followerQueryService.alreadyFollow(user.id, follower.id)) {
                 LOGGER.debug("END User already follow from ${follower.url} to ${user.url}")
-                return@transaction ActivityPubStringResponse(HttpStatusCode.OK, "accepted")
+                return@transaction
             }
             userService.follow(user.id, follower.id)
             LOGGER.debug("SUCCESS Follow from ${follower.url} to ${user.url}.")
-            ActivityPubStringResponse(HttpStatusCode.OK, "accepted")
+
         }
     }
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateService.kt
index e0d179ea..afcf4881 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateService.kt
@@ -3,16 +3,13 @@ package dev.usbharu.hideout.activitypub.service.activity.create
 import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObjectException
 import dev.usbharu.hideout.activitypub.domain.model.Create
 import dev.usbharu.hideout.activitypub.domain.model.Note
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.objects.note.APNoteService
 import dev.usbharu.hideout.application.external.Transaction
-import io.ktor.http.*
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Service
 
 interface APCreateService {
-    suspend fun receiveCreate(create: Create): ActivityPubResponse
+    suspend fun receiveCreate(create: Create)
 }
 
 @Service
@@ -20,7 +17,7 @@ class APCreateServiceImpl(
     private val apNoteService: APNoteService,
     private val transaction: Transaction
 ) : APCreateService {
-    override suspend fun receiveCreate(create: Create): ActivityPubResponse {
+    override suspend fun receiveCreate(create: Create) {
         LOGGER.debug("START Create new remote note.")
         LOGGER.trace("{}", create)
 
@@ -34,7 +31,6 @@ class APCreateServiceImpl(
             val note = value as Note
             apNoteService.fetchNote(note)
             LOGGER.debug("SUCCESS Create new remote note. ${note.id} by ${note.attributedTo}")
-            ActivityPubStringResponse(HttpStatusCode.OK, "Created")
         }
     }
 
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteService.kt
index 9d047605..68505f22 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteService.kt
@@ -1,8 +1,7 @@
 package dev.usbharu.hideout.activitypub.service.activity.delete
 
 import dev.usbharu.hideout.activitypub.domain.model.Delete
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
 
 interface APReceiveDeleteService {
-    suspend fun receiveDelete(delete: Delete): ActivityPubResponse
+    suspend fun receiveDelete(delete: Delete)
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteServiceImpl.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteServiceImpl.kt
index c00aeda6..e75fa90c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteServiceImpl.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/delete/APReceiveDeleteServiceImpl.kt
@@ -2,13 +2,10 @@ package dev.usbharu.hideout.activitypub.service.activity.delete
 
 import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObjectException
 import dev.usbharu.hideout.activitypub.domain.model.Delete
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
 import dev.usbharu.hideout.core.domain.model.post.PostRepository
 import dev.usbharu.hideout.core.query.PostQueryService
-import io.ktor.http.*
 import org.springframework.stereotype.Service
 
 @Service
@@ -17,15 +14,15 @@ class APReceiveDeleteServiceImpl(
     private val postRepository: PostRepository,
     private val transaction: Transaction
 ) : APReceiveDeleteService {
-    override suspend fun receiveDelete(delete: Delete): ActivityPubResponse = transaction.transaction {
+    override suspend fun receiveDelete(delete: Delete) = transaction.transaction {
         val deleteId = delete.`object`?.id ?: throw IllegalActivityPubObjectException("object.id is null")
 
         val post = try {
             postQueryService.findByApId(deleteId)
         } catch (_: FailedToGetResourcesException) {
-            return@transaction ActivityPubStringResponse(HttpStatusCode.OK, "Resource not found or already deleted")
+            return@transaction
         }
         postRepository.delete(post.id)
-        return@transaction ActivityPubStringResponse(HttpStatusCode.OK, "Resource was deleted.")
+        return@transaction
     }
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APReceiveFollowService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APReceiveFollowService.kt
index 95b47ad1..2011fce1 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APReceiveFollowService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/follow/APReceiveFollowService.kt
@@ -2,17 +2,14 @@ package dev.usbharu.hideout.activitypub.service.activity.follow
 
 import com.fasterxml.jackson.databind.ObjectMapper
 import dev.usbharu.hideout.activitypub.domain.model.Follow
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.core.external.job.ReceiveFollowJob
 import dev.usbharu.hideout.core.service.job.JobQueueParentService
-import io.ktor.http.*
 import org.slf4j.LoggerFactory
 import org.springframework.beans.factory.annotation.Qualifier
 import org.springframework.stereotype.Service
 
 interface APReceiveFollowService {
-    suspend fun receiveFollow(follow: Follow): ActivityPubResponse
+    suspend fun receiveFollow(follow: Follow)
 }
 
 @Service
@@ -20,14 +17,14 @@ class APReceiveFollowServiceImpl(
     private val jobQueueParentService: JobQueueParentService,
     @Qualifier("activitypub") private val objectMapper: ObjectMapper
 ) : APReceiveFollowService {
-    override suspend fun receiveFollow(follow: Follow): ActivityPubResponse {
+    override suspend fun receiveFollow(follow: Follow) {
         logger.info("FOLLOW from: {} to: {}", follow.actor, follow.`object`)
         jobQueueParentService.schedule(ReceiveFollowJob) {
             props[ReceiveFollowJob.actor] = follow.actor
             props[ReceiveFollowJob.follow] = objectMapper.writeValueAsString(follow)
             props[ReceiveFollowJob.targetActor] = follow.`object`
         }
-        return ActivityPubStringResponse(HttpStatusCode.OK, "{}", ContentType.Application.Json)
+        return
     }
 
     companion object {
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeService.kt
index c37af164..5b59550e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeService.kt
@@ -3,19 +3,16 @@ package dev.usbharu.hideout.activitypub.service.activity.like
 import dev.usbharu.hideout.activitypub.domain.exception.FailedToGetActivityPubResourceException
 import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObjectException
 import dev.usbharu.hideout.activitypub.domain.model.Like
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.objects.note.APNoteService
 import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.query.PostQueryService
 import dev.usbharu.hideout.core.service.reaction.ReactionService
-import io.ktor.http.*
 import org.slf4j.LoggerFactory
 import org.springframework.stereotype.Service
 
 interface APLikeService {
-    suspend fun receiveLike(like: Like): ActivityPubResponse
+    suspend fun receiveLike(like: Like)
 }
 
 @Service
@@ -26,7 +23,7 @@ class APLikeServiceImpl(
     private val postQueryService: PostQueryService,
     private val transaction: Transaction
 ) : APLikeService {
-    override suspend fun receiveLike(like: Like): ActivityPubResponse {
+    override suspend fun receiveLike(like: Like) {
         LOGGER.debug("START Add Like")
         LOGGER.trace("{}", like)
 
@@ -57,7 +54,7 @@ class APLikeServiceImpl(
             )
             LOGGER.debug("SUCCESS Add Like($content) from ${person.second.url} to ${post.url}")
         }
-        return ActivityPubStringResponse(HttpStatusCode.OK, "")
+        return
     }
 
     companion object {
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoService.kt
index 372ff33c..e0348b6c 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoService.kt
@@ -2,17 +2,14 @@ package dev.usbharu.hideout.activitypub.service.activity.undo
 
 import dev.usbharu.hideout.activitypub.domain.model.Follow
 import dev.usbharu.hideout.activitypub.domain.model.Undo
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
 import dev.usbharu.hideout.application.external.Transaction
 import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.hideout.core.service.user.UserService
-import io.ktor.http.*
 import org.springframework.stereotype.Service
 
 interface APUndoService {
-    suspend fun receiveUndo(undo: Undo): ActivityPubResponse
+    suspend fun receiveUndo(undo: Undo)
 }
 
 @Service
@@ -23,22 +20,22 @@ class APUndoServiceImpl(
     private val userQueryService: UserQueryService,
     private val transaction: Transaction
 ) : APUndoService {
-    override suspend fun receiveUndo(undo: Undo): ActivityPubResponse {
+    override suspend fun receiveUndo(undo: Undo) {
         if (undo.actor == null) {
-            return ActivityPubStringResponse(HttpStatusCode.BadRequest, "actor is null")
+            return
         }
 
         val type =
             undo.`object`?.type.orEmpty()
                 .firstOrNull { it == "Block" || it == "Follow" || it == "Like" || it == "Announce" || it == "Accept" }
-                ?: return ActivityPubStringResponse(HttpStatusCode.BadRequest, "unknown type ${undo.`object`?.type}")
+                ?: return
 
         when (type) {
             "Follow" -> {
                 val follow = undo.`object` as Follow
 
                 if (follow.`object` == null) {
-                    return ActivityPubStringResponse(HttpStatusCode.BadRequest, "object.object is null")
+                    return
                 }
                 transaction.transaction {
                     apUserService.fetchPerson(undo.actor!!, follow.`object`)
@@ -46,7 +43,7 @@ class APUndoServiceImpl(
                     val target = userQueryService.findByUrl(follow.`object`!!)
                     userService.unfollow(target.id, follower.id)
                 }
-                return ActivityPubStringResponse(HttpStatusCode.OK, "Accept")
+                return
             }
 
             else -> {}
diff --git a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APService.kt b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APService.kt
index e6e10495..e23ed018 100644
--- a/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/activitypub/service/common/APService.kt
@@ -3,8 +3,6 @@ package dev.usbharu.hideout.activitypub.service.common
 import com.fasterxml.jackson.databind.JsonNode
 import com.fasterxml.jackson.databind.ObjectMapper
 import dev.usbharu.hideout.activitypub.domain.exception.JsonParseException
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubResponse
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.core.external.job.InboxJob
 import dev.usbharu.hideout.core.service.job.JobQueueParentService
 import dev.usbharu.httpsignature.common.HttpRequest
@@ -21,7 +19,7 @@ interface APService {
         type: ActivityType,
         httpRequest: HttpRequest,
         map: Map<String, List<String>>
-    ): ActivityPubResponse?
+    )
 }
 
 enum class ActivityType {
@@ -226,7 +224,7 @@ class APServiceImpl(
         type: ActivityType,
         httpRequest: HttpRequest,
         map: Map<String, List<String>>
-    ): ActivityPubResponse {
+    ) {
         logger.debug("process activity: {}", type)
         jobQueueParentService.schedule(InboxJob) {
             props[it.json] = json
@@ -236,6 +234,6 @@ class APServiceImpl(
             props[it.httpRequest] = writeValueAsString
             props[it.headers] = objectMapper.writeValueAsString(map)
         }
-        return ActivityPubStringResponse(message = "")
+        return
     }
 }
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/inbox/InboxControllerImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/inbox/InboxControllerImplTest.kt
index a91e5b7f..1f2ee0a0 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/inbox/InboxControllerImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/interfaces/api/inbox/InboxControllerImplTest.kt
@@ -1,7 +1,6 @@
 package dev.usbharu.hideout.activitypub.interfaces.api.inbox
 
 import dev.usbharu.hideout.activitypub.domain.exception.JsonParseException
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.common.APService
 import dev.usbharu.hideout.activitypub.service.common.ActivityType
 import dev.usbharu.hideout.core.domain.exception.FailedToGetResourcesException
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptServiceImplTest.kt
index 77b3f74d..8f5ab942 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/accept/APAcceptServiceImplTest.kt
@@ -4,7 +4,6 @@ import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObject
 import dev.usbharu.hideout.activitypub.domain.model.Accept
 import dev.usbharu.hideout.activitypub.domain.model.Follow
 import dev.usbharu.hideout.activitypub.domain.model.Like
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.core.query.FollowerQueryService
 import dev.usbharu.hideout.core.query.UserQueryService
 import dev.usbharu.hideout.core.service.user.UserService
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateServiceImplTest.kt
index 87e66044..5eaff691 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/create/APCreateServiceImplTest.kt
@@ -4,7 +4,6 @@ import dev.usbharu.hideout.activitypub.domain.exception.IllegalActivityPubObject
 import dev.usbharu.hideout.activitypub.domain.model.Create
 import dev.usbharu.hideout.activitypub.domain.model.Like
 import dev.usbharu.hideout.activitypub.domain.model.Note
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.objects.note.APNoteService
 import io.ktor.http.*
 import kotlinx.coroutines.test.runTest
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeServiceImplTest.kt
index 3b37fffc..0cb421f5 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/like/APLikeServiceImplTest.kt
@@ -4,7 +4,6 @@ import dev.usbharu.hideout.activitypub.domain.exception.FailedToGetActivityPubRe
 import dev.usbharu.hideout.activitypub.domain.model.Like
 import dev.usbharu.hideout.activitypub.domain.model.Note
 import dev.usbharu.hideout.activitypub.domain.model.Person
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.activitypub.service.objects.note.APNoteService
 import dev.usbharu.hideout.activitypub.service.objects.user.APUserService
 import dev.usbharu.hideout.core.query.PostQueryService
diff --git a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoServiceImplTest.kt b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoServiceImplTest.kt
index fb187aec..e465944e 100644
--- a/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoServiceImplTest.kt
+++ b/src/test/kotlin/dev/usbharu/hideout/activitypub/service/activity/undo/APUndoServiceImplTest.kt
@@ -2,7 +2,6 @@ package dev.usbharu.hideout.activitypub.service.activity.undo
 
 import dev.usbharu.hideout.activitypub.domain.model.Follow
 import dev.usbharu.hideout.activitypub.domain.model.Undo
-import dev.usbharu.hideout.activitypub.interfaces.api.common.ActivityPubStringResponse
 import dev.usbharu.hideout.core.query.UserQueryService
 import io.ktor.http.*
 import kotlinx.coroutines.test.runTest