diff --git a/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/data/StateCode.kt b/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/data/StateCode.kt
index 51766c1cb..9777d5144 100644
--- a/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/data/StateCode.kt
+++ b/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/data/StateCode.kt
@@ -1,9 +1,10 @@
 package net.mamoe.mirai.api.http.data
 
 import kotlinx.serialization.Serializable
+import net.mamoe.mirai.api.http.data.common.DTO
 
 @Serializable
-open class StateCode(val code: Int, var msg: String) {
+open class StateCode(val code: Int, var msg: String) : DTO {
     object Success : StateCode(0, "success") // 成功
     object NoBot : StateCode(2, "指定Bot不存在")
     object IllegalSession : StateCode(3, "Session失效或不存在")
diff --git a/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/route/MessageRouteModule.kt b/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/route/MessageRouteModule.kt
index 8c0c69472..8e3fa1647 100644
--- a/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/route/MessageRouteModule.kt
+++ b/mirai-api-http/src/main/kotlin/net/mamoe/mirai/api/http/route/MessageRouteModule.kt
@@ -11,9 +11,11 @@ package net.mamoe.mirai.api.http.route
 
 import io.ktor.application.Application
 import io.ktor.application.call
+import io.ktor.http.HttpStatusCode
 import io.ktor.http.content.readAllParts
 import io.ktor.http.content.streamProvider
 import io.ktor.request.receiveMultipart
+import io.ktor.response.respond
 import io.ktor.response.respondText
 import io.ktor.routing.post
 import io.ktor.routing.routing
@@ -45,14 +47,12 @@ fun Application.messageModule() {
             it.session.bot.getFriend(it.target).apply {
                 sendMessage(it.messageChain.toMessageChain(this)) // this aka QQ
             }
-            call.respondStateCode(StateCode.Success)
         }
 
         miraiVerify<SendDTO>("/sendGroupMessage") {
             it.session.bot.getGroup(it.target).apply {
                 sendMessage(it.messageChain.toMessageChain(this)) // this aka Group
             }
-            call.respondStateCode(StateCode.Success)
         }
 
         miraiVerify<SendDTO>("/quoteMessage") {
@@ -100,6 +100,11 @@ fun Application.messageModule() {
                 } ?: throw IllegalAccessException("图片上传错误")
             } ?: throw IllegalAccessException("未知错误")
         }
+
+        miraiVerify<RecallDTO>("recall") {
+            // TODO
+            call.respond(HttpStatusCode.NotFound, "未完成")
+        }
     }
 }
 
@@ -121,6 +126,13 @@ private data class SendImageDTO(
 
 @Serializable
 private class SendRetDTO(
-    @Transient val stateCode: StateCode = StateCode.Success,
-    val messageId: Long
+    val messageId: Long,
+    @Transient val stateCode: StateCode = Success
 ) : StateCode(stateCode.code, stateCode.msg)
+
+@Serializable
+private data class RecallDTO(
+    override val sessionKey: String,
+    val target: Long,
+    val sender: Long
+) : VerifyDTO()