kotlinlang #ktor

is there a clever way to inject my dependencies when using extension functions of Route? atm i have a method like this but i always have to pass through my dependencies to other method calls. this feels a bit clumsy

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👍 1

Rodrigo Silva

07/19/2019, 11:08 PM

Hello all 😃. What is the best way to handle validation errors in Ktor? In spring I used the @ControllerAdvice and @ExceptionHandler (). But I'm a little lost here

Jonas Ørting

07/20/2019, 5:50 PM

Hi I need to do some basic image processing on the server (scale, crop). Is there a kotlin library for that? If not, what would be the recommended Java library? (I've never worked with Java, and I'm having a hard time figuring out what current best practice is)

carrot

07/21/2019, 10:31 PM

Pleased to say that all of Adopt Animals' (https://www.adoptanimals.io/) service level stack (website, backend services) uses Ktor now. It's faster and uses about half the memory of the setup we had previously, but we moved everything over mostly just because it's way more pleasant to work with. Thanks for making some great software 🙂

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K 5

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bitkid

07/22/2019, 8:22 AM

does anyone have experience with ktor server handling large uploads (filesize up to 10GB)? any important things to look out for, caveats? i remember seeing a user saying that he had problems with the netty engine but i can't find it anymore.

Robin Larsen

07/22/2019, 6:20 PM

Greetings! I'm getting some rather weird behavoir running Ktor with Thymeleaf template engine. Everything works fine from the IDE; templates render nicely, even with different containers (Tomcat, Netty, Jetty) But when I deploy to my actualy server running Tomcat 8.5.34, the templates don't work. I get a blank white screen after a few seconds of loading. Inspecting the console I get

net::ERR_INVALID_CHUNKED_ENCODING 200 (200)

both in Chrome and Firefox. All other endpoints not using the templates work fine (JSON, plain text) I have other apps running just fine on the same server using Thymeleaf, although the apps are made with SpringBoot. Any ideas?

max.denissov

07/23/2019, 6:13 AM

Hello! Who may help with information about how to implement a “response wrapper” pattern in the ktor-client. For example, has a model object User.

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data User(name: String)

Response from server with a wrapper: Success response:

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{
  "data": {
    "name": "Mark Watney"
  },
  "error": null
}

Business error respose:

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{

 	"data": null
 	"error": { ... }
 }

In android I can use something like an interceptor or an adapter in library like Retrofit, but what about ktor-client?

Nikolai

07/23/2019, 3:48 PM

Hi, everyone How can I perform an http request (post/get) from ktor server to another server api? A short example will be perfect.

Hamza

07/24/2019, 11:05 AM

POST <http://localhost:1296/search> 415 (Unsupported Media Type)

Alexander Potukar

07/24/2019, 1:04 PM

What is the current status of ktor and automatic creation of OpenAPI Spec aka swagger files based on source code? Does anyone know if this is possible now? To clarify: I don’t want API first but API creation based on code.

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Sergioedcigreja

07/24/2019, 1:49 PM

Hey guys.. what's the state of iOS websockets?

Slackbot

07/24/2019, 1:58 PM

This message was deleted.

rahulrav

07/25/2019, 12:11 PM

I am trying to add cache control headers to static pages served via the

resources

handler. For some reason I don’t see the correct response headers. What am I doing wrong ? https://github.com/tikurahul/rahulrav-com/blob/master/src/main/kotlin/com/rahulrav/Application.kt#L47 https://github.com/tikurahul/rahulrav-com/blob/master/src/main/kotlin/com/rahulrav/RequestHandlers.kt#L25

➕ 1

sonofblip

07/25/2019, 3:06 PM

Anyone have experience with generating swagger docs with ktor?

Hamza

07/25/2019, 4:10 PM

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get("/{*}") {
            call.respond("hello")
        }

didn't work for

and

/{anything}/{something}

sonofblip

07/25/2019, 6:43 PM

Is there a way to apply ktor annotation classes across whole projects? I’m tired of having to put

@KtorExperimentalLocationsAPI

@KtorExperimentalAPI

over everything in order to remove IntelliJ warnings.

Sergioedcigreja

07/26/2019, 10:52 AM

Hey guys, quick question: Im getting a networkOnMainThread error when I do client.close().. what's the best way to close the client?

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Fail

07/26/2019, 2:27 PM

Why

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expectSuccess = false

not working at 1.2.2? On Ktor multiplatform I catch Platform exception I tried the following options:

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HttpClient {
            expectSuccess = false

and

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HttpClient {
HttpResponseValidator {
                validateResponse {response ->
                    if (response.status.value!=200) {
                        throw ResponseException(response)
                    }
                }

            }

And

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ResponseException

not catched. Only

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Exception

not Solved 😞

spierce7

07/27/2019, 10:17 PM

I'm trying to create a redirect, so that all bad urls redirect the user back to my main site. I've noticed that this ends up interfering with my

static

block for some image requests (i.e.

/favicon-32x32.png

) aren't found and get returned with the redirect, but when I comment out the

redirectUnknown

function, it works fine. It's odd because my

static

block is placed before

redirectUnknown

. Does anyone know of a better way to do this?

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fun Route.redirectUnknown() {
    // Unknown path - redirect back to main site
    get("*") {
        val domain = call.request.domain()
        val port: String = run {
            val port = call.request.port()
            if (port == 80 || port == 443) "" else ":$port"
        }

        val redirectUrl: String = if (BuildUtil.isDev) {
            val scheme = call.request.origin.scheme

            if (domain.value == "localhost" || domain.isIpAddress()) {
                "$scheme://$domain$port/"
            } else {
                "$<scheme://www>.$domain$port/"
            }
        } else {
            "<https://www>.$domain$port/"
        }

        call.respondRedirect(redirectUrl)
    }
}

Dominaezzz

07/29/2019, 9:55 AM

When I do

val response = client.get<HttpResponse>(....)

, do I also have to do

response.close()

? Can't find docs and the samples don't give an indication.

👌 1

spierce7

07/29/2019, 8:40 PM

If I wanted to intercept all server requests that aren't https, and aren't prefixed with

www

, and redirect to the

<https://www>.

version of my site - what would be the best way to do that?

Bino

07/30/2019, 8:54 AM

Does anyone know, how I can integrate a

dns-sd

zeroconf/bonjour

into ktor? I would like to announce the ktor service in a local network without setting the ip/host on the client.

Thomas

07/30/2019, 6:58 PM

Hello,

ResponseException

is not serializable, it throws a

NotSerializableException

. This is because of the

response

field. Can this be changed so it is serializable? https://github.com/ktorio/ktor/blob/178479ba392524d37193fcf2f6b30f570a0a3ba7/ktor-client/ktor-client-core/common/src/io/ktor/client/features/DefaultResponseValidation.kt#L51

Robert Menke

07/31/2019, 12:14 AM

Ha omitting

response.close()

caused one of our servers to run out of memory today @Dominaezzz. Just fixed it and fortunately had no downtime because ECS is pretty nice 🙂.

🤔 1

Melih Aksoy

07/31/2019, 11:20 AM

Hey all ! I’m using Ktor in a multiplatform library, where I need to post some json body to url. My current setup for dependencies is

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sourceSets {
        commonMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib-common'
                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core-common:$coroutine_version"
                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-common:$serializer_version"

                implementation "io.ktor:ktor-client-core:$ktor_version"
                implementation "io.ktor:ktor-client-json:$ktor_version"
            }
        }
        androidMain {
            dependencies {
                implementation 'org.jetbrains.kotlin:kotlin-stdlib'
                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutine_version"
                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutine_version"
                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime:$serializer_version"

                implementation "io.ktor:ktor-client-android:$ktor_version"
                implementation "io.ktor:ktor-client-json-jvm:$ktor_version"
            }
        }
        iosMain {
            dependencies {
                implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core-native:$coroutine_version"
                implementation "org.jetbrains.kotlinx:kotlinx-serialization-runtime-native:$serializer_version"


                implementation "io.ktor:ktor-client-ios:$ktor_version"
                implementation "io.ktor:ktor-client-json-native:$ktor_version"
            }

        }
    }

I’m having trouble with keeping client in common. If I use client in common module as just an

HttpClient()

, without features, I’m getting class cast exception as in https://github.com/ktorio/ktor/issues/997. Defining content type does not solve it, but I can add

JsonFeature

to my client. This ends up crashing in Android tho:

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Caused by: java.lang.IllegalStateException: Fail to find serializer. Consider to add one of the following dependencies: 
     - ktor-client-gson
     - ktor-client-json // <- Oh well, it's actually there isn't it ?
     - ktor-client-serialization

As seen above in dependencies, I’m including

io.ktor:ktor-client-json

in common, but it does not contain any serializer that I can assign in

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install(JsonFeature) {
            serializer = ????
}

block. If I define serializer as

expect

and try to implement

actual

for Android, it’s fine, but again, I can’t find any for iOS implmentation (

io.ktor:ktor-client-json-native

). What is the right way to do this by using

kotlinx.serialization

for both platforms ?

Big Chungus

08/01/2019, 3:38 PM

As in ktor clent based on okhttp

08/01/2019, 6:33 PM

📣 ktor

1.2.3

has been published * JS websocket bugs fixes and improvements * Eliminated Java9's Base64 implementation (useful for older JDK and Android) * Fixed bug of adding unexpected trailing slash (#1201) (#1206) * Improved apache and okhttp client engines performance * Fixed client response body cancellation * Added client response streaming on nodejs * Deprecated old client

BasicAuth

* Introduced a flag to send auth without negotiation * Added server kotlinx.serialization initial support (

SerializationConverter

) * Client TLS implementation fixes: cancellation and error handling. * Added web assembly content type. * Prohibited server double request content

call.receive

. * Introduce

DoubleReceive

feature that makes it work. * Server CORS support fixed and improved * Added initial kotlinx.serialization support for server including receiving generic collections. * Introduced

ktor-bom

for better dependency management. * Improved jetty server engine configuration to enable manual connectors setup. * Fixed client memory leak (#1223). * Upgraded Jetty, Netty and utility libraries. * Kotlin 1.3.41 ⚠️ Breaking changes/Migration steps: * CORS doesn’t allow non-simple request body content types anymore by default * to allow extra content types such as json, enable

allowNonSimpleContentTypes

* At least Kotlin 1.3.41 IS REQUIRED

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andrew

08/01/2019, 9:54 PM

Is there a builtin way to adapt a response?