I am new to ktor and trying to create api in it.As I have downloaded project from ktor.io and opened it inside IntelliJ idea community edition then run button is showing disabled and when I am running it on right clicking on application.kt file and clicking on run application option.Its showing:
ktor.application - Responding at http://0.0.0.0:8080
When I am going to this link on webpage it is showing:
The web page at http://0.0.0.0:8080/ might be temporarily down or it may have moved permanently to a new web address.
Even if I have get route defined below is my code:
Application.kt
fun main() {
embeddedServer(Netty, port = 8080, host = "0.0.0.0") {
configureRouting()
}.start(wait = true)
}
Routing.kt
fun Application.configureRouting() {
// Starting point for a Ktor app:
routing {
get("/") {
call.respondText("Hello World!")
}
}
}
Someone let me know What is an issue and how can I resolve it.
Related
i got the same problem every time i try to deploy to heruko
https://prnt.sc/IeH3wooTqqAj
a screenshot from the terminal
1- https://prnt.sc/fqpj3f2lQTz8
2- https://prnt.sc/-710l_bznc2B
this is my application.kt
fun main() {
embeddedServer(Netty, port = 8087, host = "0.0.0.0") {
module {
module()
}
}.start(wait = true)
}
Suppress("unused")
fun Application.module() {
configureKoin()
configureAuth()
configureRouting()
configureSerialization()
configureMonitoring()
configureSession()
}
Prockfile
web: build/install/com.example.googleauth/bin/com.example.googleauth
worker: python scheduler.py
every thing is uptodate and i also add the Config Vars on heroku setting
i also tryed the embedded way and also the engin way same issue
I've written a simple Ktor server that processes a JSON payload from an incoming POST request. Now, I want to spawn this server from another application, and after processing the request, shut it down.
So the first problem I need to solve is: how do I spawn the Ktor server from some other 'driver' Kotlin code? All the tutorials I've found online are 1-2 years old, and are apparently using an older version of Ktor, where the main class looks like this:
fun main(args: Array<String>) {
embeddedServer(Netty, 8080) {
routing {
get("/") {
call.respondText("Hello from Kotlin Backend", ContentType.Text.Html)
}
}
}.start(wait = true)
}
It's easy to see that one can just run the embeddedServer(Netty, 8080) { ... }.start(wait = true) from wherever they want, to spawn the server. But I downloaded the Ktor plugin for IntelliJ IDEA yesterday, and it seems things have changed lately. This is what the new main class looks like:
fun main(args: Array<String>): Unit = io.ktor.server.netty.EngineMain.main(args)
#Suppress("unused") // Referenced in application.conf
#kotlin.jvm.JvmOverloads
fun Application.module(testing: Boolean = false) {
install(ContentNegotiation) {
gson {
}
}
routing {
get("/") {
call.respondText("HELLO WORLD!", contentType = ContentType.Text.Plain)
}
get("/json/gson") {
call.respond(mapOf("hello" to "world"))
}
}
}
Now, the Application.module(...) function takes care of setting up the routing and stuff, while the actual running of the server is done internally by io.ktor.server.netty.EngineMain.main(args). Also, properties like the port number are referenced from the application.conf file, and I'm not quite sure how it figures out where to find that application.conf file.
I have been able to run this Ktor server using gradlew. I also understand that it is possible to export it as an executable jar and run it (as explained here). But I can't find out how to run it from code. Any suggestions?
Edit: And it would be nice if I could set the port number from the driver code.
I tried to search in api docs as well as examples, but there weren't any example demonstrating how to send pings and receive pings. The only example was of how to connect to websocket and to send a text here.
I also saw chat sample here of server side and i carefully followed that as well (i.e. set ping interval in server side configuration of WebSocket installation).
I start listening both side for pongs but none of the side was receiving any ping messages.
And there is no option to configure the client side for pings as you can see here.
I'm so much confused about how to send pings.
This is my server side:
embeddedServer(
CIO,
80
) {
install(io.ktor.websocket.WebSockets) {
pingPeriod = Duration.ofSeconds(20)
}
routing {
webSocket("/ws") {
for (frame in incoming) {
when (frame) {
is Frame.Pong -> {
println("ping's response recieved")
}
is Frame.Ping -> {
// just temporary block
println("ping recieved")
}
is Frame.Text -> {
println(frame.readText())
}
}
}
}
}
}.apply { start() }
This is my client side:
val client = HttpClient(CIO) {
install(WebSockets)
}
client.ws(
method = HttpMethod.Get,
host = "127.0.0.1",
port = 80,
path = "/ws"
) {
send(Frame.Text("Hello World!"))
for (frame in incoming) {
when (frame) {
is Frame.Pong -> {
println("ping's response received")
}
is Frame.Ping -> {
// just temporary block
println("ping recieved from server")
}
is Frame.Text -> {
println(frame.readText())
}
}
}
}
Result:
Hello World!
i.e websocket is connected, text are able to transferred, but unfortunately can't use ping/pong feature.
I also found some functions for this here pinger and ponger but now it says its part of api and gets automatically start with initiation of WebsocketSession and i also tried to put pinger in client side but that didn't send ping to server whatsoever.
Result of above code is simply Hello world gets printed in server console as sent from client side but no ping received messages.
I was having trouble getting OkHttp to use ping/pong so I filed this issue https://github.com/ktorio/ktor/issues/1803 and one of the developers replied "well the only thing I can recommend you is to try CIO out. Is does support manual Ping/Pong processing using RawWebSockets."
Haven't tried it myself but you should check out https://github.com/ktorio/ktor/blob/master/ktor-features/ktor-websockets/jvm/test/io/ktor/tests/websocket/RawWebSocketTest.kt
Intro: Hi folks, I'd like to ask some questions about extension developing. I'd like to create a remote lua debuger extension (for linux user, haven't found any working lua debugger). When I touch the launch button, the debug server should be started to listen (on e.g. 0.0.0.0:8723) for waiting debugger connection. And on the other side sould communicate through the DAP (debug adapter protocol) with vscode.
Problem: I'm starting to implement the my own debuger extension... But I am new in this topic and with Node.js also. My question is: How can I log (or debug) my LoggingDebugSession (where the DAP is implemented)?
I looked at the MockDebug extension example project.And tried to rewrite...
Try to log into console, my file luaDebugSession.ts:
export class LuaDebugSession extends LoggingDebugSession {
public constructor() {
super("remote-lua-debug-log.txt");
this.sendEvent(new OutputEvent("Try to log"));
console.log("Try log into console")
}
protected initializeRequest(response: DebugProtocol.InitializeResponse, args: DebugProtocol.InitializeRequestArguments): void {
this.sendEvent(new OutputEvent("Try to log 2"));
console.log("Try log into console 2")
// do something
this.sendEvent(new InitializedEvent());
}
// next code...
}
In console should be the logged output.
I'm using ktor 0.9.5. I'm trying a simple example. But when a try to connect to the server i get ERR_EMPTY_RESPONSE. This is my code.
fun main(args: Array<String>) {
embeddedServer(Netty, port = 8080, host = "localhost") {
install(DefaultHeaders)
install(CallLogging)
routing {
get(path = "/") {
call.respondText("Hello World!!")
}
}
}.start()
}
Doing some research I found that changing the project to Maven fix the problem, but because of rules of my organization I can't do it. Any other solution... Thanks before hand.
I have added a println("sometext") before call.respondText("Hello World!!") and it's never executed.
With ERR_EMPTY_RESPONSE error, I guess you are requesting the server from a Google Chrome browser. Right ?
Are you trying to connect to the server from another computer? If so it won't work because you have set the server to only respond for requests coming from localhost.
embeddedServer(Netty, port = 8080, host = "localhost")
Even if you add a println() it won't execute.
Try to remove host = "localhost" from embeddedServer() parameters an re-test.