diff --git a/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/ChatRouting.kt b/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/ChatRouting.kt
index 7f4a908..ba65c8e 100644
--- a/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/ChatRouting.kt
+++ b/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/ChatRouting.kt
@@ -2,17 +2,16 @@ package ru.shadowsparky.gigawear.backend.presentation
 
 import io.ktor.server.request.receive
 import io.ktor.server.response.respond
-import io.ktor.server.routing.Routing
+import io.ktor.server.routing.Route
 import io.ktor.server.routing.post
 import ru.shadowsparky.chat.backend.domain.ProcessUserMessageUseCase
 import ru.shadowsparky.chat.domain.Message
 
 private const val MOCK_USER_ID = -1L
 
-fun Routing.setupChat(useCase: ProcessUserMessageUseCase) {
+fun Route.setupChat(useCase: ProcessUserMessageUseCase) {
     post("chat") {
         val message = call.receive<Message>().copy(timestamp = System.currentTimeMillis())
         call.respond(useCase.execute(message, MOCK_USER_ID))
     }
-
 }
diff --git a/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/UpdateRouting.kt b/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/UpdateRouting.kt
new file mode 100644
index 0000000..43b0561
--- /dev/null
+++ b/apps/giga-wear/backend/src/main/kotlin/ru/shadowsparky/gigawear/backend/presentation/UpdateRouting.kt
@@ -0,0 +1,17 @@
+package ru.shadowsparky.gigawear.backend.presentation
+
+import io.ktor.server.request.receive
+import io.ktor.server.response.respond
+import io.ktor.server.routing.Route
+import io.ktor.server.routing.Routing
+import io.ktor.server.routing.post
+import ru.shadowsparky.chat.backend.domain.ProcessUserMessageUseCase
+import ru.shadowsparky.chat.domain.Message
+
+fun Route.setupUpdate(useCase: ProcessUserMessageUseCase) {
+    post("chat") {
+        val message = call.receive<Message>().copy(timestamp = System.currentTimeMillis())
+        call.respond(useCase.execute(message, MOCK_USER_ID))
+    }
+}
+
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
index 1a46b38..4d78bae 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/Main.kt
@@ -2,17 +2,19 @@ package ru.shadowsparky.vbox.backend
 
 import io.ktor.server.application.Application
 import io.ktor.server.application.ApplicationStopping
+import io.ktor.server.routing.routing
 import kotlinx.coroutines.runBlocking
 import org.koin.core.annotation.KoinApplication
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.get
 import org.koin.plugin.module.dsl.startKoin
+import ru.shadowsparky.backend.presentation.installStatusPages
 import ru.shadowsparky.koin
 import ru.shadowsparky.vbox.backend.domain.CacheStorage
 import ru.shadowsparky.vbox.backend.presentation.configureJwt
-import ru.shadowsparky.vbox.backend.presentation.configureRouting
 import ru.shadowsparky.vbox.backend.presentation.configureSerialization
 import ru.shadowsparky.vbox.backend.presentation.configureWebSocket
+import ru.shadowsparky.vbox.backend.presentation.routing.setupAuthMethods
 
 @KoinApplication(modules = [BackendModule::class])
 object VBoxBackend
@@ -30,5 +32,6 @@ fun Application.module() {
     configureSerialization(koin.get())
     configureJwt(koin.get())
     configureWebSocket(koin.get())
-    configureRouting(koin.get(), koin.get())
+    installStatusPages()
+    routing { setupAuthMethods(koin.get(), koin.get()) }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendSearchRepository.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendSearchRepository.kt
index b1caec9..91a6cea 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendSearchRepository.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendSearchRepository.kt
@@ -4,10 +4,11 @@ import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.withContext
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.SearchRepository
 import java.sql.SQLException
 
@@ -59,6 +60,9 @@ class BackendSearchRepository(
     }
 
     private suspend fun notifyChanged() {
-        eventHandler.notify(RemoteEvent.OnSearch(System.currentTimeMillis(), userId))
+        eventHandler.notify(
+            RemoteEvent.OnSearch(System.currentTimeMillis(), userId),
+            RemoteEvent.serializer()
+        )
     }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/recent/BackendRecentlyWatchedRepository.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/recent/BackendRecentlyWatchedRepository.kt
index 1272091..b838e97 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/recent/BackendRecentlyWatchedRepository.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/recent/BackendRecentlyWatchedRepository.kt
@@ -3,11 +3,12 @@ package ru.shadowsparky.vbox.backend.data.recent
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.withContext
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
 import ru.shadowsparky.vbox.shared.domain.RecentlyWatchedRepository
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.model.RecentlyWatchedInfo
 import java.sql.SQLException
 
@@ -85,7 +86,8 @@ class BackendRecentlyWatchedRepository(
                 System.currentTimeMillis(),
                 userId,
                 seasonId
-            )
+            ),
+            RemoteEvent.serializer()
         )
     }
 }
\ No newline at end of file
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/saved/BackendSavedMovieRepository.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/saved/BackendSavedMovieRepository.kt
index f404a8f..4bf7334 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/saved/BackendSavedMovieRepository.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/saved/BackendSavedMovieRepository.kt
@@ -7,10 +7,11 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import ru.shadowsparky.backend.data.Logger
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.SavedMovieRepository
 import ru.shadowsparky.vbox.shared.domain.model.SERIAL_FLAG
 import ru.shadowsparky.vbox.shared.domain.model.VideoDetails
@@ -50,7 +51,10 @@ class BackendSavedMovieRepository(
                     details.id,
                     userId
                 )
-                eventHandler.notify(RemoteEvent.OnSaved(userId, details.id))
+                eventHandler.notify(
+                    RemoteEvent.OnSaved(userId, details.id),
+                    RemoteEvent.serializer()
+                )
             } catch (_: SQLException) {
             }
         }
@@ -67,7 +71,10 @@ class BackendSavedMovieRepository(
         logger.debug(TAG, "remove(${id})")
         withContext(dispatcherProvider.io) {
             db.saved_movieQueries.removeSavedMovie(userId, id)
-            eventHandler.notify(RemoteEvent.OnSaved(userId, id))
+            eventHandler.notify(
+                RemoteEvent.OnSaved(userId, id),
+                RemoteEvent.serializer()
+            )
         }
     }
 
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendMovieTagRepository.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendMovieTagRepository.kt
index dc5c2f1..a95896d 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendMovieTagRepository.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendMovieTagRepository.kt
@@ -8,11 +8,12 @@ import kotlinx.coroutines.flow.flow
 import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import org.koin.core.annotation.Factory
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.domain.DispatcherProvider
 import ru.shadowsparky.http.domain.BadRequestException
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.tag.MovieTagRepository
 import ru.shadowsparky.vbox.shared.domain.tag.TagInfo
 
@@ -62,12 +63,18 @@ class BackendMovieTagRepository(
 
     override suspend fun link(movieId: Long, tag: String) {
         dbQueries.linkMovieTag(movieId, findTagId(tag), userId).await()
-        movieEventHandler.notify(RemoteEvent.OnMovieTag(userId, movieId))
+        movieEventHandler.notify(
+            RemoteEvent.OnMovieTag(userId, movieId),
+            RemoteEvent.serializer()
+        )
     }
 
     override suspend fun unlink(movieId: Long, tag: String) {
         dbQueries.unlinkMovieTag(movieId, findTagId(tag), userId).await()
-        movieEventHandler.notify(RemoteEvent.OnMovieTag(userId, movieId))
+        movieEventHandler.notify(
+            RemoteEvent.OnMovieTag(userId, movieId),
+            RemoteEvent.serializer()
+        )
     }
 
     private suspend fun findTagId(tag: String): Long = withContext(dispatcherProvider.io) {
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendUserTagRepository.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendUserTagRepository.kt
index 837b415..e1ffb23 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendUserTagRepository.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/tags/BackendUserTagRepository.kt
@@ -5,10 +5,11 @@ import app.cash.sqldelight.coroutines.mapToList
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.map
 import org.koin.core.annotation.Factory
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.tag.TagInfo
 import ru.shadowsparky.vbox.shared.domain.tag.UserTagRepository
 
@@ -47,16 +48,25 @@ class BackendUserTagRepository(
 
     override suspend fun add(tag: String) {
         queries.insertUserTag(userId, tag).await()
-        userTagEventHandler.notify(RemoteEvent.OnUserTag(userId))
+        userTagEventHandler.notify(
+            RemoteEvent.OnUserTag(userId),
+            RemoteEvent.serializer()
+        )
     }
 
     override suspend fun edit(oldTag: String, newTag: String) {
         queries.updateTagText(newTag, oldTag, userId).await()
-        userTagEventHandler.notify(RemoteEvent.OnUserTag(userId))
+        userTagEventHandler.notify(
+            RemoteEvent.OnUserTag(userId),
+            RemoteEvent.serializer()
+        )
     }
 
     override suspend fun delete(tag: String) {
         queries.deleteTagById(tag, userId).await()
-        userTagEventHandler.notify(RemoteEvent.OnUserTag(userId))
+        userTagEventHandler.notify(
+            RemoteEvent.OnUserTag(userId),
+            RemoteEvent.serializer()
+        )
     }
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/EntryPoint.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/EntryPoint.kt
index 95a5d7d..eb3654e 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/EntryPoint.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/EntryPoint.kt
@@ -3,11 +3,12 @@ package ru.shadowsparky.vbox.backend.di
 import kotlinx.serialization.json.Json
 import org.koin.core.annotation.Single
 import ru.shadowsparky.backend.data.TokenVerifier
+import ru.shadowsparky.backend.data.event.SessionRegistry
 import ru.shadowsparky.backend.domain.JwtInfo
 import ru.shadowsparky.backend.domain.LoginVerifier
+import ru.shadowsparky.backend.domain.RemoteEventHandler
 import ru.shadowsparky.chat.backend.domain.ProcessUserMessageUseCase
 import ru.shadowsparky.vbox.backend.data.BackendUpdateFetcherFactory
-import ru.shadowsparky.vbox.backend.data.SessionRegistry
 import ru.shadowsparky.vbox.backend.data.auth.AuthTokenRepositoryFactory
 import ru.shadowsparky.vbox.backend.data.chat.BackendChatRepositoryFactory
 import ru.shadowsparky.vbox.backend.data.tags.MovieTagRepositoryFactory
@@ -15,7 +16,6 @@ import ru.shadowsparky.vbox.backend.data.tags.UserTagRepositoryFactory
 import ru.shadowsparky.vbox.backend.di.factory.RecentlyWatchedRepositoryFactory
 import ru.shadowsparky.vbox.backend.di.factory.SavedMovieRepositoryFactory
 import ru.shadowsparky.vbox.backend.di.factory.SearchRepositoryFactory
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.VideoApi
 
 @Single
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/RecentlyWatchedRepositoryFactory.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/RecentlyWatchedRepositoryFactory.kt
index ead2198..f4f126f 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/RecentlyWatchedRepositoryFactory.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/RecentlyWatchedRepositoryFactory.kt
@@ -1,13 +1,13 @@
 package ru.shadowsparky.vbox.backend.di.factory
 
 import org.koin.core.annotation.Factory
+import ru.shadowsparky.backend.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.backend.data.recent.BackendRecentlyWatchedRepository
 import ru.shadowsparky.vbox.backend.data.recent.CacheRecentlyWatchedRepository
 import ru.shadowsparky.vbox.backend.domain.CacheStorage
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
 import ru.shadowsparky.vbox.shared.domain.RecentlyWatchedRepository
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 
 @Factory
 class RecentlyWatchedRepositoryFactory(
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SavedMovieRepositoryFactory.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SavedMovieRepositoryFactory.kt
index f7403ae..a39a836 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SavedMovieRepositoryFactory.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SavedMovieRepositoryFactory.kt
@@ -2,8 +2,8 @@ package ru.shadowsparky.vbox.backend.di.factory
 
 import org.koin.core.annotation.Factory
 import ru.shadowsparky.backend.data.Logger
+import ru.shadowsparky.backend.data.event.BackendRemoteEventHandler
 import ru.shadowsparky.vbox.backend.AppDatabase
-import ru.shadowsparky.vbox.backend.data.BackendRemoteEventHandler
 import ru.shadowsparky.vbox.backend.data.saved.BackendSavedMovieRepository
 import ru.shadowsparky.vbox.backend.data.saved.CacheSavedMovieRepository
 import ru.shadowsparky.vbox.backend.domain.CacheStorage
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SearchRepositoryFactory.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SearchRepositoryFactory.kt
index 82d22da..366d528 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SearchRepositoryFactory.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/di/factory/SearchRepositoryFactory.kt
@@ -1,10 +1,10 @@
 package ru.shadowsparky.vbox.backend.di.factory
 
 import org.koin.core.annotation.Factory
+import ru.shadowsparky.backend.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.backend.AppDatabase
 import ru.shadowsparky.vbox.backend.data.BackendSearchRepository
 import ru.shadowsparky.vbox.shared.di.factory.DispatcherProvider
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.SearchRepository
 
 @Factory
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
index 8af777c..76f8712 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Jwt.kt
@@ -1,59 +1,17 @@
 package ru.shadowsparky.vbox.backend.presentation
 
-import io.ktor.http.HttpStatusCode
 import io.ktor.server.application.Application
 import io.ktor.server.application.ApplicationCall
-import io.ktor.server.application.install
-import io.ktor.server.auth.Authentication
-import io.ktor.server.auth.authentication
-import io.ktor.server.auth.jwt.JWTPrincipal
-import io.ktor.server.auth.jwt.jwt
-import io.ktor.server.response.respond
-import ru.shadowsparky.backend.domain.INVALID_TOKEN_MSG
-import ru.shadowsparky.backend.domain.LOGIN_NAME
-import ru.shadowsparky.backend.domain.VerifyTokenException
+import ru.shadowsparky.backend.presentation.configureJwt
+import ru.shadowsparky.backend.presentation.obtainUserId
 import ru.shadowsparky.vbox.backend.di.AuthEntryPoint
-import ru.shadowsparky.vbox.shared.domain.USER_ID_ARG
-import ru.shadowsparky.vbox.shared.domain.model.ServerExceptionInfo
 
 const val AUTH_JWT_NAME = "auth-jwt"
 
 fun Application.configureJwt(authEntryPoint: AuthEntryPoint) = with(authEntryPoint) {
-    install(Authentication) {
-        jwt(AUTH_JWT_NAME) {
-            realm = jwtInfo.realm
-            verifier(tokenVerifier.verifier)
-            validate { credential ->
-                val login = credential.payload.getClaim(LOGIN_NAME).asString()
-                try {
-                    if (login != null) {
-                        loginVerifier.verify(login)
-                        if (credential.payload.expiresAt == null) {
-                            throw VerifyTokenException("Static tokens not supported!")
-                        }
-                        JWTPrincipal(credential.payload)
-                    } else {
-                        null
-                    }
-                } catch (e: VerifyTokenException) {
-                    routingLogger.error("verify token failed ${e.message}")
-                    null
-                }
-            }
-            challenge { _, _ ->
-                call.respond(
-                    HttpStatusCode.Unauthorized,
-                    ServerExceptionInfo(INVALID_TOKEN_MSG)
-                )
-            }
-        }
-    }
+    configureJwt(jwtInfo, tokenVerifier, loginVerifier)
 }
 
 fun ApplicationCall.obtainUserId(): Long {
-    val principal = authentication.principal<JWTPrincipal>()
-        ?: throw VerifyTokenException(INVALID_TOKEN_MSG)
-    return principal.payload
-        .getClaim(USER_ID_ARG)
-        .asLong()
+    return obtainUserId()
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Routing.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Routing.kt
deleted file mode 100644
index 497d337..0000000
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/Routing.kt
+++ /dev/null
@@ -1,42 +0,0 @@
-package ru.shadowsparky.vbox.backend.presentation
-
-import io.ktor.http.HttpStatusCode
-import io.ktor.server.application.Application
-import io.ktor.server.application.install
-import io.ktor.server.plugins.statuspages.StatusPages
-import io.ktor.server.response.respond
-import io.ktor.server.routing.routing
-import org.slf4j.Logger
-import org.slf4j.LoggerFactory
-import ru.shadowsparky.http.domain.HttpException
-import ru.shadowsparky.vbox.backend.di.AuthEntryPoint
-import ru.shadowsparky.vbox.backend.di.RoutingEntryPoint
-import ru.shadowsparky.vbox.backend.presentation.routing.setupAuthMethods
-import ru.shadowsparky.vbox.shared.domain.model.ServerExceptionInfo
-
-val routingLogger: Logger = LoggerFactory.getLogger("routing")
-
-fun Application.configureRouting(
-    routingEntryPoint: RoutingEntryPoint,
-    authEntryPoint: AuthEntryPoint
-) {
-    install(StatusPages) {
-        exception<HttpException> { call, cause ->
-            routingLogger.error("http exception occurred. returns ${cause.httpCode}", cause)
-            call.respond(
-                status = HttpStatusCode.fromValue(cause.httpCode),
-                message = ServerExceptionInfo(cause.message ?: "Неизвестная ошибка")
-            )
-        }
-        exception<Throwable> { call, cause ->
-            routingLogger.error("error occurred. returns 500...", cause)
-            call.respond(
-                status = HttpStatusCode.InternalServerError,
-                message = ServerExceptionInfo(cause.message ?: "Неизвестная ошибка")
-            )
-        }
-    }
-    routing {
-        setupAuthMethods(routingEntryPoint, authEntryPoint)
-    }
-}
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
index f326110..0cf5067 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/WebSocket.kt
@@ -1,100 +1,10 @@
 package ru.shadowsparky.vbox.backend.presentation
 
-import com.auth0.jwt.exceptions.TokenExpiredException
-import com.auth0.jwt.interfaces.DecodedJWT
-import io.ktor.http.HttpStatusCode
 import io.ktor.server.application.Application
-import io.ktor.server.application.install
-import io.ktor.server.routing.routing
-import io.ktor.server.websocket.WebSockets
-import io.ktor.server.websocket.pingPeriod
-import io.ktor.server.websocket.timeout
-import io.ktor.server.websocket.webSocket
-import io.ktor.websocket.Frame
-import io.ktor.websocket.readText
-import kotlinx.coroutines.CompletableDeferred
-import kotlinx.coroutines.channels.ReceiveChannel
-import kotlinx.coroutines.channels.SendChannel
-import kotlinx.serialization.json.Json
-import ru.shadowsparky.backend.data.TokenVerifier
-import ru.shadowsparky.http.domain.BadRequestException
-import ru.shadowsparky.http.domain.HttpException
-import ru.shadowsparky.vbox.backend.data.SessionRegistry
-import ru.shadowsparky.vbox.backend.data.eventLogger
+import ru.shadowsparky.backend.presentation.setupWebSocket
 import ru.shadowsparky.vbox.backend.di.WebSocketEntryPoint
-import ru.shadowsparky.vbox.shared.domain.AuthRequest
-import ru.shadowsparky.vbox.shared.domain.AuthResponse
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
-import ru.shadowsparky.vbox.shared.domain.USER_ID_ARG
-import kotlin.time.Duration.Companion.seconds
+import ru.shadowsparky.vbox.shared.domain.ON_EVENT
 
 fun Application.configureWebSocket(socketEntryPoint: WebSocketEntryPoint) = with(socketEntryPoint) {
-    install(WebSockets) {
-        pingPeriod = (30).seconds
-        timeout = (30).seconds
-        maxFrameSize = Long.MAX_VALUE
-        masking = false
-    }
-    routing {
-        webSocket(RemoteEventHandler.ON_EVENT) {
-            val userId = incoming.authFlow(json, tokenVerifier, outgoing)
-            val session = SessionRegistry.Writer { text -> outgoing.trySend(Frame.Text(text)) }
-            sessionRegistry.put(userId, session)
-            val deferred = CompletableDeferred<Unit?>()
-            try {
-                outgoing.invokeOnClose { deferred.complete(null) }
-                deferred.await()
-            } finally {
-                sessionRegistry.remove(userId, session)
-            }
-        }
-    }
-}
-
-private suspend fun ReceiveChannel<Frame>.receiveTextOrNull(): String? {
-    val frame = receive()
-    return if (frame is Frame.Text) frame.readText() else null
-}
-
-private suspend fun ReceiveChannel<Frame>.authFlow(
-    json: Json,
-    tokenVerifier: TokenVerifier,
-    sendChannel: SendChannel<Frame>
-): Long {
-    val rawRequest = receiveTextOrNull() ?: throw BadRequestException("Authentication request required")
-    val request = runCatching { json.decodeFromString<AuthRequest>(rawRequest) }.getOrNull()
-    val decodedJwt = if (request == null) {
-        tokenVerifier.verify(rawRequest)
-    } else {
-        authFlowV2(request, json, tokenVerifier, sendChannel)
-    }
-    return decodedJwt.getClaim(USER_ID_ARG).asLong()
-}
-
-private const val MAX_ATTEMPTS = 3
-
-private suspend fun ReceiveChannel<Frame>.authFlowV2(
-    initialRequest: AuthRequest,
-    json: Json,
-    tokenVerifier: TokenVerifier,
-    sendChannel: SendChannel<Frame>
-): DecodedJWT {
-    var currentRequest = initialRequest
-    repeat(MAX_ATTEMPTS) { attempt ->
-        try {
-            val jwt = tokenVerifier.verify(currentRequest.token)
-            sendChannel.send(Frame.Text(json.encodeToString(AuthResponse(true))))
-            return jwt
-        } catch (e: TokenExpiredException) {
-            eventLogger.error("token expired. attempt=$attempt", e)
-            if (attempt == MAX_ATTEMPTS - 1) return@repeat
-            sendChannel.send(Frame.Text(json.encodeToString(AuthResponse(false, e.message))))
-            val nextRaw = receiveTextOrNull() ?: return@repeat
-            currentRequest = json.decodeFromString<AuthRequest>(nextRaw)
-        } catch (e: Exception) {
-            eventLogger.error("unable to verify token", e)
-            throw HttpException(HttpStatusCode.Unauthorized)
-        }
-    }
-    throw HttpException(HttpStatusCode.Unauthorized)
+    setupWebSocket(ON_EVENT, json, tokenVerifier, sessionRegistry)
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/routing/ChatRouting.kt b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/routing/ChatRouting.kt
index 5b2eea6..2690b3e 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/routing/ChatRouting.kt
+++ b/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/presentation/routing/ChatRouting.kt
@@ -5,6 +5,8 @@ import io.ktor.server.response.respond
 import io.ktor.server.routing.Route
 import io.ktor.server.routing.get
 import io.ktor.server.routing.post
+import ru.shadowsparky.backend.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.notify
 import ru.shadowsparky.chat.backend.domain.ProcessUserMessageUseCase
 import ru.shadowsparky.chat.domain.ChatRepository
 import ru.shadowsparky.chat.domain.ChatRoles
@@ -15,7 +17,6 @@ import ru.shadowsparky.vbox.backend.data.chat.BackendChatRepositoryFactory
 import ru.shadowsparky.vbox.backend.presentation.obtainUserId
 import ru.shadowsparky.vbox.shared.domain.DYNAMIC_PREFIX
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 
 fun Route.setupChat(
     chatRepositoryFactory: BackendChatRepositoryFactory,
@@ -33,7 +34,10 @@ fun Route.setupChat(
         val info = call.receive<Message>()
         if (info.role != ChatRoles.USER) throw BadRequestException("invalid role")
         val response = processUserMessageUseCase.execute(info, userId)
-        remoteEventHandler.notify(RemoteEvent.OnChatUpdate(userId))
+        remoteEventHandler.notify(
+            RemoteEvent.OnChatUpdate(userId),
+            RemoteEvent.serializer()
+        )
         call.respond(response)
     }
 }
diff --git a/apps/vbox/client/shared/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/data/RemoteEventListenerImpl.kt b/apps/vbox/client/shared/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/data/RemoteEventListenerImpl.kt
index 84f5f7a..b1afab3 100644
--- a/apps/vbox/client/shared/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/data/RemoteEventListenerImpl.kt
+++ b/apps/vbox/client/shared/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/data/RemoteEventListenerImpl.kt
@@ -4,114 +4,50 @@ import io.ktor.client.HttpClient
 import io.ktor.client.plugins.websocket.webSocket
 import io.ktor.client.request.url
 import io.ktor.http.HttpMethod
-import io.ktor.websocket.Frame
-import io.ktor.websocket.readText
-import kotlinx.coroutines.CancellationException
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.ExperimentalCoroutinesApi
 import kotlinx.coroutines.SupervisorJob
-import kotlinx.coroutines.channels.ReceiveChannel
-import kotlinx.coroutines.channels.SendChannel
-import kotlinx.coroutines.delay
 import kotlinx.coroutines.flow.Flow
 import kotlinx.coroutines.flow.SharingStarted
+import kotlinx.coroutines.flow.emitAll
 import kotlinx.coroutines.flow.filterNotNull
-import kotlinx.coroutines.flow.retryWhen
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.flow.shareIn
 import kotlinx.coroutines.flow.transformLatest
 import kotlinx.serialization.json.Json
 import org.koin.core.annotation.Single
-import ru.shadowsparky.domain.Log
+import ru.shadowsparky.http.data.RemoveEventProcessor
+import ru.shadowsparky.http.data.retryExponential
 import ru.shadowsparky.http.domain.TokenStorage
-import ru.shadowsparky.vbox.shared.domain.AuthRequest
-import ru.shadowsparky.vbox.shared.domain.AuthResponse
 import ru.shadowsparky.vbox.shared.domain.HealthCheck
+import ru.shadowsparky.vbox.shared.domain.ON_EVENT
 import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
 import ru.shadowsparky.vbox.shared.domain.RemoteEventListener
 import ru.shadowsparky.vbox.shared.domain.ServerConfigurationRepository
 import ru.shadowsparky.vbox.shared.domain.getServerConfiguration
-import kotlin.math.pow
-import kotlin.time.Duration.Companion.milliseconds
 
 @Single
 class RemoteEventListenerImpl(
     private val httpClient: HttpClient,
     private val serverConfigurationRepository: ServerConfigurationRepository,
-    private val authTokenCache: TokenStorage,
+    authTokenCache: TokenStorage,
     private val healthCheck: HealthCheck,
-    private val json: Json,
-    private val log: Log
+    private val processor: RemoveEventProcessor,
+    private val json: Json
 ) : RemoteEventListener {
     private val scope = CoroutineScope(SupervisorJob() + Dispatchers.Default)
 
     @OptIn(ExperimentalCoroutinesApi::class)
-    override val event = authTokenCache.token.filterNotNull().transformLatest { token ->
+    override val event: Flow<RemoteEvent> = authTokenCache.token.filterNotNull().transformLatest { token ->
         val config = serverConfigurationRepository.getServerConfiguration()
-        log.d(TAG, "listener started")
-        try {
-            httpClient.webSocket(
-                method = HttpMethod.Get,
-                request = { url(config.asWebSocketStr() + "/${RemoteEventHandler.ON_EVENT}") }
-            ) {
-                authV2(token.token, incoming, outgoing)
-                for (frame in incoming) {
-                    if (frame is Frame.Text) {
-                        val text = frame.readText()
-                        try {
-                            val decoded = json.decodeFromString<RemoteEvent>(text)
-                            log.d(TAG, "receive $text $decoded")
-                            emit(decoded)
-                        } catch (e: Exception) {
-                            log.e(TAG, e, "failed to decode message: $text")
-                        }
-                    }
-                }
-            }
-        } catch (e: Exception) {
-            log.e(TAG, e, "websocket closed with error")
-            throw e
-        } finally {
-            log.d(TAG, "listener finished")
+        httpClient.webSocket(
+            method = HttpMethod.Get,
+            request = { url(config.asWebSocketStr() + "/${ON_EVENT}") }
+        ) {
+            val flow = processor.process(token.token, this) { healthCheck.check() }
+                .map { json.decodeFromString<RemoteEvent>(it) }
+            emitAll(flow)
         }
     }.retryExponential { true }.shareIn(scope, SharingStarted.WhileSubscribed(500), 0)
-
-    private suspend fun authV2(
-        token: String,
-        input: ReceiveChannel<Frame>,
-        output: SendChannel<Frame>
-    ) {
-        output.send(Frame.Text(json.encodeToString(AuthRequest(token))))
-        val rawFrame = (input.receive() as Frame.Text).readText()
-        val response = json.decodeFromString<AuthResponse>(rawFrame)
-        if (!response.ok) {
-            healthCheck.check()
-            error("Authentication failed")
-        }
-    }
-
-    private fun <T> Flow<T>.retryExponential(
-        maxRetries: Int = Int.MAX_VALUE,
-        initialDelay: Long = 5000L,
-        maxDelay: Long = 300_000L,
-        factor: Double = 2.0,
-        shouldRetry: (Throwable) -> Boolean = { true }
-    ): Flow<T> = retryWhen { cause, attempt ->
-        log.d(TAG, "error occurred, attempt=$attempt", cause)
-        if (!shouldRetry(cause) || attempt >= maxRetries || cause is CancellationException) {
-            false
-        } else {
-            val delayTime = (initialDelay * factor.pow(attempt.toDouble()))
-                .toLong()
-                .coerceAtMost(maxDelay)
-            log.d(TAG, "retry after delay $delayTime", cause)
-            delay(delayTime.milliseconds)
-            true
-        }
-    }
-
-    private companion object {
-        const val TAG = "RemoteSearchEventListener"
-    }
 }
diff --git a/apps/vbox/common/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/domain/RemoteEventHandler.kt b/apps/vbox/common/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/domain/RemoteEventHandler.kt
index 2da5e93..d271448 100644
--- a/apps/vbox/common/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/domain/RemoteEventHandler.kt
+++ b/apps/vbox/common/src/commonMain/kotlin/ru/shadowsparky/vbox/shared/domain/RemoteEventHandler.kt
@@ -4,13 +4,7 @@ import kotlinx.coroutines.flow.Flow
 import kotlinx.serialization.SerialName
 import kotlinx.serialization.Serializable
 
-interface RemoteEventHandler {
-    suspend fun notify(eventInfo: RemoteEvent)
-
-    companion object {
-        const val ON_EVENT = "$DYNAMIC_PREFIX/onEvent"
-    }
-}
+const val ON_EVENT = "$DYNAMIC_PREFIX/onEvent"
 
 interface RemoteEventListener {
     val event: Flow<RemoteEvent>
@@ -45,11 +39,3 @@ sealed interface RemoteEvent {
     @SerialName("OnChatUpdate")
     data class OnChatUpdate(override val userId: Long) : RemoteEvent
 }
-
-@Serializable
-@SerialName("AuthRequest")
-data class AuthRequest(val token: String)
-
-@Serializable
-@SerialName("AuthResponse")
-data class AuthResponse(val ok: Boolean, val error: String? = null)
diff --git a/libs/backend-base/build.gradle.kts b/libs/backend-base/build.gradle.kts
index 7400a92..e713e01 100644
--- a/libs/backend-base/build.gradle.kts
+++ b/libs/backend-base/build.gradle.kts
@@ -1,8 +1,16 @@
 plugins {
     alias(libs.plugins.convention.jvm)
     alias(libs.plugins.convention.koin)
+    alias(libs.plugins.ktor)
+    alias(libs.plugins.convention.serialization)
 }
 dependencies {
+    implementation(project(":libs:http-client"))
     implementation(libs.java.jwt)
     implementation(libs.logback.classic)
+    implementation(libs.ktor.server.core.jvm)
+    implementation(libs.ktor.server.auth)
+    implementation(libs.ktor.server.websockets.jvm)
+    implementation(libs.ktor.server.auth.jwt)
+    implementation(libs.ktor.server.status.pages.jvm)
 }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendRemoteEventHandler.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/BackendRemoteEventHandler.kt
similarity index 54%
rename from apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendRemoteEventHandler.kt
rename to libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/BackendRemoteEventHandler.kt
index d1da013..14ef143 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/BackendRemoteEventHandler.kt
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/BackendRemoteEventHandler.kt
@@ -1,22 +1,24 @@
-package ru.shadowsparky.vbox.backend.data
+package ru.shadowsparky.backend.data.event
 
-import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonElement
+import kotlinx.serialization.json.jsonObject
+import kotlinx.serialization.json.jsonPrimitive
+import kotlinx.serialization.json.longOrNull
 import org.koin.core.annotation.Single
 import org.slf4j.Logger
 import org.slf4j.LoggerFactory
-import ru.shadowsparky.vbox.shared.domain.RemoteEvent
-import ru.shadowsparky.vbox.shared.domain.RemoteEventHandler
+import ru.shadowsparky.backend.domain.RemoteEventHandler
 
 val eventLogger: Logger = LoggerFactory.getLogger("events")
 
 @Single
 class BackendRemoteEventHandler(
-    private val json: Json,
     private val registry: SessionRegistry
 ) : RemoteEventHandler {
-    override suspend fun notify(eventInfo: RemoteEvent) {
-        val jsonText = json.encodeToString(eventInfo)
-        val writers = registry.get(eventInfo.userId)
+    override suspend fun notify(eventInfo: JsonElement) {
+        val userId = eventInfo.jsonObject["userId"]?.jsonPrimitive?.longOrNull
+            ?: error("User id field required")
+        val writers = registry.get(userId)
         if (writers.isNullOrEmpty()) {
             eventLogger.info("unable to notify {}. sessions not found, cache {}", eventInfo, registry)
             return
@@ -24,10 +26,10 @@ class BackendRemoteEventHandler(
         writers.toList().forEach { writer ->
             eventLogger.info("notify[{}]. session {}", eventInfo, writer)
             try {
-                writer.writeText(jsonText)
+                writer.writeText(eventInfo.toString())
             } catch (e: Exception) {
                 eventLogger.error("unable to notify {}. delete session. Reason: {}", writer, e.message)
-                registry.remove(eventInfo.userId, writer)
+                registry.remove(userId, writer)
             }
         }
     }
diff --git a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/SessionRegistry.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/SessionRegistry.kt
similarity index 95%
rename from apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/SessionRegistry.kt
rename to libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/SessionRegistry.kt
index 88c2fcd..896fae6 100644
--- a/apps/vbox/backend/src/main/kotlin/ru/shadowsparky/vbox/backend/data/SessionRegistry.kt
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/data/event/SessionRegistry.kt
@@ -1,4 +1,4 @@
-package ru.shadowsparky.vbox.backend.data
+package ru.shadowsparky.backend.data.event
 
 import org.koin.core.annotation.Single
 import java.util.concurrent.ConcurrentHashMap
diff --git a/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/Events.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/Events.kt
new file mode 100644
index 0000000..1c289ee
--- /dev/null
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/Events.kt
@@ -0,0 +1,18 @@
+package ru.shadowsparky.backend.domain
+
+import kotlinx.serialization.SerializationStrategy
+import kotlinx.serialization.json.Json
+import kotlinx.serialization.json.JsonElement
+import org.koin.mp.KoinPlatform
+
+interface RemoteEventHandler {
+    suspend fun notify(eventInfo: JsonElement)
+}
+
+suspend fun <T> RemoteEventHandler.notify(
+    any: T,
+    serializer: SerializationStrategy<T>,
+) {
+    val json = KoinPlatform.getKoin().get<Json>()
+    notify(json.encodeToJsonElement(serializer, any))
+}
diff --git a/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/ExceptionInfo.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/ExceptionInfo.kt
new file mode 100644
index 0000000..07288c9
--- /dev/null
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/domain/ExceptionInfo.kt
@@ -0,0 +1,6 @@
+package ru.shadowsparky.backend.domain
+
+import kotlinx.serialization.Serializable
+
+@Serializable
+data class ExceptionInfo(val msg: String)
diff --git a/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/KtorExtensions.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/KtorExtensions.kt
new file mode 100644
index 0000000..bd609cd
--- /dev/null
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/KtorExtensions.kt
@@ -0,0 +1,90 @@
+package ru.shadowsparky.backend.presentation
+
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.Application
+import io.ktor.server.application.ApplicationCall
+import io.ktor.server.application.install
+import io.ktor.server.auth.Authentication
+import io.ktor.server.auth.authentication
+import io.ktor.server.auth.jwt.JWTPrincipal
+import io.ktor.server.auth.jwt.jwt
+import io.ktor.server.plugins.statuspages.StatusPages
+import io.ktor.server.response.respond
+import org.slf4j.Logger
+import org.slf4j.LoggerFactory
+import ru.shadowsparky.backend.data.TokenVerifier
+import ru.shadowsparky.backend.domain.ExceptionInfo
+import ru.shadowsparky.backend.domain.INVALID_TOKEN_MSG
+import ru.shadowsparky.backend.domain.JwtInfo
+import ru.shadowsparky.backend.domain.LOGIN_NAME
+import ru.shadowsparky.backend.domain.LoginVerifier
+import ru.shadowsparky.backend.domain.USER_ID_ARG
+import ru.shadowsparky.backend.domain.VerifyTokenException
+import ru.shadowsparky.http.domain.HttpException
+
+const val AUTH_JWT_NAME = "auth-jwt"
+
+val routingLogger: Logger = LoggerFactory.getLogger("routing")
+
+fun ApplicationCall.obtainUserId(): Long {
+    val principal = authentication.principal<JWTPrincipal>()
+        ?: throw VerifyTokenException(INVALID_TOKEN_MSG)
+    return principal.payload
+        .getClaim(USER_ID_ARG)
+        .asLong()
+}
+
+fun Application.configureJwt(
+    jwtInfo: JwtInfo,
+    tokenVerifier: TokenVerifier,
+    loginVerifier: LoginVerifier
+) {
+    install(Authentication) {
+        jwt(AUTH_JWT_NAME) {
+            realm = jwtInfo.realm
+            verifier(tokenVerifier.verifier)
+            validate { credential ->
+                val login = credential.payload.getClaim(LOGIN_NAME).asString()
+                try {
+                    if (login != null) {
+                        loginVerifier.verify(login)
+                        if (credential.payload.expiresAt == null) {
+                            throw VerifyTokenException("Static tokens not supported!")
+                        }
+                        JWTPrincipal(credential.payload)
+                    } else {
+                        null
+                    }
+                } catch (e: VerifyTokenException) {
+                    routingLogger.error("verify token failed ${e.message}")
+                    null
+                }
+            }
+            challenge { _, _ ->
+                call.respond(
+                    HttpStatusCode.Unauthorized,
+                    ExceptionInfo(INVALID_TOKEN_MSG)
+                )
+            }
+        }
+    }
+}
+
+fun Application.installStatusPages() {
+    install(StatusPages) {
+        exception<HttpException> { call, cause ->
+            routingLogger.error("http exception occurred. returns ${cause.httpCode}", cause)
+            call.respond(
+                status = HttpStatusCode.fromValue(cause.httpCode),
+                message = ExceptionInfo(cause.message ?: "Неизвестная ошибка")
+            )
+        }
+        exception<Throwable> { call, cause ->
+            routingLogger.error("error occurred. returns 500...", cause)
+            call.respond(
+                status = HttpStatusCode.InternalServerError,
+                message = ExceptionInfo(cause.message ?: "Неизвестная ошибка")
+            )
+        }
+    }
+}
diff --git a/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/WebSocketExtensions.kt b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/WebSocketExtensions.kt
new file mode 100644
index 0000000..f70c94d
--- /dev/null
+++ b/libs/backend-base/src/main/kotlin/ru/shadowsparky/backend/presentation/WebSocketExtensions.kt
@@ -0,0 +1,105 @@
+package ru.shadowsparky.backend.presentation
+
+import com.auth0.jwt.exceptions.TokenExpiredException
+import com.auth0.jwt.interfaces.DecodedJWT
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.application.Application
+import io.ktor.server.application.install
+import io.ktor.server.routing.routing
+import io.ktor.server.websocket.WebSockets
+import io.ktor.server.websocket.pingPeriod
+import io.ktor.server.websocket.timeout
+import io.ktor.server.websocket.webSocket
+import io.ktor.websocket.Frame
+import io.ktor.websocket.readText
+import kotlinx.coroutines.CompletableDeferred
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.channels.SendChannel
+import kotlinx.serialization.json.Json
+import ru.shadowsparky.backend.data.TokenVerifier
+import ru.shadowsparky.backend.data.event.SessionRegistry
+import ru.shadowsparky.backend.data.event.eventLogger
+import ru.shadowsparky.backend.domain.USER_ID_ARG
+import ru.shadowsparky.http.domain.AuthRequest
+import ru.shadowsparky.http.domain.AuthResponse
+import ru.shadowsparky.http.domain.BadRequestException
+import ru.shadowsparky.http.domain.HttpException
+import kotlin.time.Duration.Companion.seconds
+
+fun Application.setupWebSocket(
+    path: String?,
+    json: Json,
+    tokenVerifier: TokenVerifier,
+    sessionRegistry: SessionRegistry
+) {
+    install(WebSockets) {
+        pingPeriod = (30).seconds
+        timeout = (30).seconds
+        maxFrameSize = Long.MAX_VALUE
+        masking = false
+    }
+    path?.let {
+        routing {
+            webSocket(path) {
+                val userId = incoming.authFlow(json, tokenVerifier, outgoing)
+                val session = SessionRegistry.Writer { text -> outgoing.trySend(Frame.Text(text)) }
+                sessionRegistry.put(userId, session)
+                val deferred = CompletableDeferred<Unit?>()
+                try {
+                    outgoing.invokeOnClose { deferred.complete(null) }
+                    deferred.await()
+                } finally {
+                    sessionRegistry.remove(userId, session)
+                }
+            }
+        }
+    }
+}
+
+private suspend fun ReceiveChannel<Frame>.receiveTextOrNull(): String? {
+    val frame = receive()
+    return if (frame is Frame.Text) frame.readText() else null
+}
+
+private suspend fun ReceiveChannel<Frame>.authFlow(
+    json: Json,
+    tokenVerifier: TokenVerifier,
+    sendChannel: SendChannel<Frame>
+): Long {
+    val rawRequest = receiveTextOrNull() ?: throw BadRequestException("Authentication request required")
+    val request = runCatching { json.decodeFromString<AuthRequest>(rawRequest) }.getOrNull()
+    val decodedJwt = if (request == null) {
+        tokenVerifier.verify(rawRequest)
+    } else {
+        authFlowV2(request, json, tokenVerifier, sendChannel)
+    }
+    return decodedJwt.getClaim(USER_ID_ARG).asLong()
+}
+
+private const val MAX_ATTEMPTS = 3
+
+private suspend fun ReceiveChannel<Frame>.authFlowV2(
+    initialRequest: AuthRequest,
+    json: Json,
+    tokenVerifier: TokenVerifier,
+    sendChannel: SendChannel<Frame>
+): DecodedJWT {
+    var currentRequest = initialRequest
+    repeat(MAX_ATTEMPTS) { attempt ->
+        try {
+            val jwt = tokenVerifier.verify(currentRequest.token)
+            sendChannel.send(Frame.Text(json.encodeToString(AuthResponse(true))))
+            return jwt
+        } catch (e: TokenExpiredException) {
+            eventLogger.error("token expired. attempt=$attempt", e)
+            if (attempt == MAX_ATTEMPTS - 1) return@repeat
+            sendChannel.send(Frame.Text(json.encodeToString(AuthResponse(false, e.message))))
+            val nextRaw = receiveTextOrNull() ?: return@repeat
+            currentRequest = json.decodeFromString<AuthRequest>(nextRaw)
+        } catch (e: Exception) {
+            eventLogger.error("unable to verify token", e)
+            throw HttpException(HttpStatusCode.Unauthorized)
+        }
+    }
+    throw HttpException(HttpStatusCode.Unauthorized)
+}
diff --git a/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/data/RemoveEventProcessor.kt b/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/data/RemoveEventProcessor.kt
new file mode 100644
index 0000000..0004bc6
--- /dev/null
+++ b/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/data/RemoveEventProcessor.kt
@@ -0,0 +1,85 @@
+package ru.shadowsparky.http.data
+
+import io.ktor.client.plugins.websocket.DefaultClientWebSocketSession
+import io.ktor.websocket.Frame
+import io.ktor.websocket.readText
+import kotlinx.coroutines.CancellationException
+import kotlinx.coroutines.channels.ReceiveChannel
+import kotlinx.coroutines.channels.SendChannel
+import kotlinx.coroutines.delay
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.flow.retryWhen
+import kotlinx.serialization.json.Json
+import org.koin.core.annotation.Single
+import ru.shadowsparky.domain.Log
+import ru.shadowsparky.http.domain.AuthRequest
+import ru.shadowsparky.http.domain.AuthResponse
+import kotlin.math.pow
+import kotlin.time.Duration.Companion.milliseconds
+
+@Single
+class RemoveEventProcessor(
+    private val json: Json,
+    private val log: Log
+) {
+    fun process(
+        token: String,
+        session: DefaultClientWebSocketSession,
+        onTokenInvalid: suspend () -> Unit
+    ): Flow<String> {
+        val incoming = session.incoming
+        val outgoing = session.outgoing
+        return flow {
+            authV2(token, incoming, outgoing, onTokenInvalid)
+            for (frame in incoming) {
+                if (frame is Frame.Text) {
+                    val text = frame.readText()
+                    try {
+                        log.d(TAG, "receive $text")
+                        emit(text)
+                    } catch (e: Exception) {
+                        log.e(TAG, e, "failed to decode message: $text")
+                    }
+                }
+            }
+        }
+    }
+
+    private suspend fun authV2(
+        token: String,
+        input: ReceiveChannel<Frame>,
+        output: SendChannel<Frame>,
+        onTokenInvalid: suspend () -> Unit
+    ) {
+        output.send(Frame.Text(json.encodeToString(AuthRequest(token))))
+        val rawFrame = (input.receive() as Frame.Text).readText()
+        val response = json.decodeFromString<AuthResponse>(rawFrame)
+        if (!response.ok) {
+            onTokenInvalid()
+            error("Authentication failed")
+        }
+    }
+
+    private companion object {
+        const val TAG = "RemoveEventProcessor"
+    }
+}
+
+fun <T> Flow<T>.retryExponential(
+    maxRetries: Int = Int.MAX_VALUE,
+    initialDelay: Long = 5000L,
+    maxDelay: Long = 300_000L,
+    factor: Double = 2.0,
+    shouldRetry: (Throwable) -> Boolean = { true }
+): Flow<T> = retryWhen { cause, attempt ->
+    if (!shouldRetry(cause) || attempt >= maxRetries || cause is CancellationException) {
+        false
+    } else {
+        val delayTime = (initialDelay * factor.pow(attempt.toDouble()))
+            .toLong()
+            .coerceAtMost(maxDelay)
+        delay(delayTime.milliseconds)
+        true
+    }
+}
diff --git a/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/domain/Events.kt b/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/domain/Events.kt
new file mode 100644
index 0000000..670be34
--- /dev/null
+++ b/libs/http-client/src/commonMain/kotlin/ru/shadowsparky/http/domain/Events.kt
@@ -0,0 +1,12 @@
+package ru.shadowsparky.http.domain
+
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+
+@Serializable
+@SerialName("AuthRequest")
+data class AuthRequest(val token: String)
+
+@Serializable
+@SerialName("AuthResponse")
+data class AuthResponse(val ok: Boolean, val error: String? = null)