fixes in ExposedOneToManyKeyValueRepo and includeWebsocketHandling

ktor/server/src/jvmMain/kotlin/dev/inmo/micro_utils/ktor/server/FlowsWebsocket.kt

@@ -2,25 +2,23 @@ package dev.inmo.micro_utils.ktor.server
 
 import dev.inmo.micro_utils.coroutines.safely
 import dev.inmo.micro_utils.ktor.common.*
+import io.ktor.application.featureOrNull
+import io.ktor.application.install
 import io.ktor.http.cio.websocket.*
 import io.ktor.routing.Route
+import io.ktor.routing.application
 import io.ktor.websocket.webSocket
 import kotlinx.coroutines.flow.Flow
-import kotlinx.coroutines.flow.collect
 import kotlinx.serialization.SerializationStrategy
 
-private suspend fun DefaultWebSocketSession.checkReceivedAndCloseIfExists() {
-    if (incoming.tryReceive() != null) {
-        close()
-        throw CorrectCloseException
-    }
-}
-
 fun <T> Route.includeWebsocketHandling(
     suburl: String,
     flow: Flow<T>,
     converter: (T) -> StandardKtorSerialInputData
 ) {
+    application.apply {
+        featureOrNull(io.ktor.websocket.WebSockets) ?: install(io.ktor.websocket.WebSockets)
+    }
     webSocket(suburl) {
         safely {
             flow.collect {