git init

src/main/kotlin/Routing.kt

@@ -0,0 +1,27 @@
+package io.github.sor2171
+
+import io.ktor.server.application.*
+import io.ktor.server.response.*
+import io.ktor.server.routing.*
+import io.ktor.server.websocket.*
+import io.ktor.websocket.*
+import java.time.Duration
+
+fun Application.configureRouting() {
+    routing {
+        get("/") {
+            call.respondText("Hello, World!")
+        }
+        webSocket("/ws") { // websocketSession
+            for (frame in incoming) {
+                if (frame is Frame.Text) {
+                    val text = frame.readText()
+                    outgoing.send(Frame.Text("YOU SAID: $text"))
+                    if (text.equals("bye", ignoreCase = true)) {
+                        close(CloseReason(CloseReason.Codes.NORMAL, "Client said BYE"))
+                    }
+                }
+            }
+        }
+    }
+}

src/main/kotlin/Websockets.kt

@@ -0,0 +1,16 @@
+package io.github.sor2171
+
+import io.ktor.server.application.*
+import io.ktor.server.response.*
+import io.ktor.server.websocket.*
+import io.ktor.websocket.*
+import kotlin.time.Duration.Companion.seconds
+
+fun Application.configureWebsockets() {
+    install(WebSockets) {
+        pingPeriod = 15.seconds
+        timeout = 15.seconds
+        maxFrameSize = Long.MAX_VALUE
+        masking = false
+    }
+}

src/main/kotlin/main.kt

@@ -0,0 +1,5 @@
+package io.github.sor2171
+
+fun main(args: Array<String>) {
+    io.ktor.server.cio.EngineMain.main(args)
+}

src/main/resources/application.yaml

@@ -0,0 +1,7 @@
+ktor:
+  deployment:
+    port: 8080
+  application:
+    modules:
+      - io.github.sor2171.WebsocketsKt.configureWebsockets
+      - io.github.sor2171.RoutingKt.configureRouting

src/main/resources/logback.xml

@@ -0,0 +1,12 @@
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{YYYY-MM-dd HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</pattern>
+        </encoder>
+    </appender>
+    <root level="INFO">
+        <appender-ref ref="STDOUT"/>
+    </root>
+    <logger name="org.eclipse.jetty" level="INFO"/>
+    <logger name="io.netty" level="INFO"/>
+</configuration>

src/test/kotlin/ServerTest.kt

@@ -0,0 +1,18 @@
+package io.github.sor2171
+
+import io.ktor.client.request.get
+import io.ktor.http.HttpStatusCode
+import io.ktor.server.testing.testApplication
+import kotlin.test.*
+
+class ServerTest {
+
+    @Test
+    fun `test root endpoint`() = testApplication {
+        // loads default configuration
+        configure()
+        // verify server root returns 200
+        assertEquals(HttpStatusCode.OK, client.get("/").status)
+    }
+
+}