diff --git a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
index 0dfb5c30..e2b83d5e 100644
--- a/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/plugins/ActivityPub.kt
@@ -6,8 +6,10 @@ import dev.usbharu.hideout.repository.IUserAuthRepository
 import dev.usbharu.hideout.service.IUserAuthService
 import dev.usbharu.hideout.service.UserAuthService
 import dev.usbharu.hideout.util.HttpUtil.Activity
+import io.ktor.client.*
 import io.ktor.client.plugins.api.*
 import io.ktor.client.request.*
+import io.ktor.client.statement.*
 import io.ktor.http.*
 import io.ktor.server.application.*
 import io.ktor.server.response.*
@@ -38,6 +40,16 @@ suspend fun <T : JsonLd> ApplicationCall.respondAp(message: T, status: HttpStatu
     respondText(activityJson, ContentType.Application.Activity, status)
 }
 
+suspend fun HttpClient.postAp(urlString: String,username:String,jsonLd: JsonLd): HttpResponse {
+    return this.post(urlString){
+        header("Accept", ContentType.Application.Activity)
+        header("Content-Type", ContentType.Application.Activity)
+        header("Signature","keyId=\"$username\",algorithm=\"rsa-sha256\",headers=\"(request-target) digest date\"")
+        val text = Config.configData.objectMapper.writeValueAsString(jsonLd)
+        setBody(text)
+    }
+}
+
 class HttpSignaturePluginConfig {
     lateinit var keyMap: KeyMap
 }
diff --git a/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt b/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
index 30af9e41..672f59aa 100644
--- a/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
+++ b/src/main/kotlin/dev/usbharu/hideout/service/ActivityPubUserService.kt
@@ -2,45 +2,41 @@ package dev.usbharu.hideout.service
 
 import dev.usbharu.hideout.ap.*
 import dev.usbharu.hideout.config.Config
-import dev.usbharu.hideout.util.HttpUtil.Activity
+import dev.usbharu.hideout.plugins.postAp
 import io.ktor.client.*
-import io.ktor.client.call.*
-import io.ktor.client.plugins.*
-import io.ktor.client.request.*
-import io.ktor.http.*
 
 class ActivityPubUserService(
-        private val httpClient: HttpClient,
-        private val userService: UserService,
-        private val userAuthService: IUserAuthService,
-        private val webFingerService: IWebFingerService
+    private val httpClient: HttpClient,
+    private val userService: UserService,
+    private val userAuthService: IUserAuthService,
+    private val webFingerService: IWebFingerService
 ) {
     suspend fun generateUserModel(name: String): Person {
         val userEntity = userService.findByName(name)
         val userAuthEntity = userAuthService.findByUserId(userEntity.id)
         val userUrl = "${Config.configData.url}/users/$name"
         return Person(
+            type = emptyList(),
+            name = userEntity.name,
+            id = userUrl,
+            preferredUsername = name,
+            summary = userEntity.description,
+            inbox = "$userUrl/inbox",
+            outbox = "$userUrl/outbox",
+            url = userUrl,
+            icon = Image(
                 type = emptyList(),
-                name = userEntity.name,
-                id = userUrl,
-                preferredUsername = name,
-                summary = userEntity.description,
-                inbox = "$userUrl/inbox",
-                outbox = "$userUrl/outbox",
-                url = userUrl,
-                icon = Image(
-                        type = emptyList(),
-                        name = "$userUrl/icon.png",
-                        mediaType = "image/png",
-                        url = "$userUrl/icon.png"
-                ),
-                publicKey = Key(
-                        type = emptyList(),
-                        name = "Public Key",
-                        id = "$userUrl/pubkey",
-                        owner = userUrl,
-                        publicKeyPem = userAuthEntity.publicKey
-                )
+                name = "$userUrl/icon.png",
+                mediaType = "image/png",
+                url = "$userUrl/icon.png"
+            ),
+            publicKey = Key(
+                type = emptyList(),
+                name = "Public Key",
+                id = "$userUrl/pubkey",
+                owner = userUrl,
+                publicKeyPem = userAuthEntity.publicKey
+            )
         )
     }
 
@@ -48,14 +44,12 @@ class ActivityPubUserService(
         val actor = follow.actor ?: throw IllegalArgumentException("actor is null")
         val person = webFingerService.fetchUserModel(actor) ?: throw IllegalArgumentException("actor is not found")
         val inboxUrl = person.inbox ?: throw IllegalArgumentException("inbox is not found")
-        httpClient.post(inboxUrl) {
-            contentType(ContentType.Application.Activity)
-            header("Signature","keyId=\"${person.preferredUsername}\",algorithm=\"rsa-sha256\",headers=\"(request-target) digest date\"")
-            setBody(Accept(
-                    name = "Follow",
-                    `object` = follow,
-                    actor = follow.`object`.orEmpty()
-            ))
-        }
+        httpClient.postAp(
+            inboxUrl, person.preferredUsername!!, Accept(
+                name = "Follow",
+                `object` = follow,
+                actor = follow.`object`.orEmpty()
+            )
+        )
     }
 }