Content-Type

application/octet-stream

No transformation found

install(JsonFeature) {
    serializer = serializerProvider.get()
    accept(ContentType.Application.Json, ContentType.Application.OctetStream)
}

TrustManager

ERROR ktor.application - Unhandled: GET - /favicon.ico
java.lang.NumberFormatException: For input string: "favicon.ico"

install(ContentNegotiation) { gson { this.setPrettyPrinting() } }

Cannot access class 'com.google.gson.GsonBuilder'. Check your module classpath for missing or conflicting dependencies

ktor-gson

HttpResponse

<http://client.post|client.post><HttpResponse>(url) {}

HttpResponse

String

For most efficiency, you'll have one ConnectionPool​ and one Dispatcher in your process. These can be shared by many OkHttpClient instances.

HEAD

HttpClient

httpClient.head<HttpResponse> {
    url {
         protocol = URLProtocol.HTTPS
         host = "<http://www.website.com/trying/to/get/etag/outta/here|www.website.com/trying/to/get/etag/outta/here>"
    }
}

java.nio.channels.UnresolvedAddressException

json.encodeToString()

appengineRun

Caused by: <http://java.net|java.net>.BindException: Address already in use: bind

localhost:8080

java.lang.IllegalArgumentException: text is empty (possibly HTTP/0.9)
at io.netty.handler.codec.http.HttpVersion.valueOf(HttpVersion.java:64)
at io.netty.handler.codec.http.HttpRequestDecoder.createMessage(HttpRequestDecoder.java:95)
at io.netty.handler.codec.http.HttpObjectDecoder.decode(HttpObjectDecoder.java:250)
...
2021-03-01 12:39:12.067 [eventLoopGroupProxy-4-31] TRACE Application - Failed to decode request
java.lang.IllegalArgumentException: invalid version format: D|¢Þ:À/ÀÀ'À0ÀÀ(/<5=AÀ+À À#À,À
at io.netty.handler.codec.http.HttpVersion.<init>(HttpVersion.java:120)
...
INFO Application - >>> REQUEST: Unhandled: GET - /templates <- I added these logs for debugging

private val _client: HttpClient = HttpClient(engine) {
    install(JsonFeature) {
        val json = kotlinx.serialization.json.Json {
            this.isLenient = true
            this.ignoreUnknownKeys = true
        }
        serializer = KotlinxSerializer(json)
    }
    install(Logging) {
        logger = Logger.DEFAULT
        level = LogLevel.ALL
    }
}

call.receive<Data>()

JsonDecodingException

ContentTransformationException

StatusPage

abstract class BaseClient<T> constructor(private val httpClient: HttpClient) {

    suspend fun get(): T = httpClient.get<T>("/api/") // T is a reified type: HttpClient.get<reified T>(path: String)

}

Responding at <http://0.0.0.0:9090>
Failed to initialize a channel. Closing: [id: 0xce532d4b, L:/[0:0:0:0:0:0:0:1]:9090 - R:/[0:0:0:0:0:0:0:1]:62473]
java.lang.NoSuchMethodError: 'kotlinx.coroutines.channels.Channel kotlinx.coroutines.channels.ChannelKt.Channel$default(int, kotlinx.coroutines.channels.BufferOverflow, kotlin.jvm.functions.Function1, int, java.lang.Object)'
	at io.ktor.server.netty.cio.NettyRequestQueue.<init>(NettyRequestQueue.kt:19)
	at io.ktor.server.netty.NettyChannelInitializer.configurePipeline(NettyChannelInitializer.kt:104)
	at io.ktor.server.netty.NettyChannelInitializer.initChannel(NettyChannelInitializer.kt:89)
	at io.ktor.server.netty.NettyChannelInitializer.initChannel(NettyChannelInitializer.kt:28)
	at io.netty.channel.ChannelInitializer.initChannel(ChannelInitializer.java:129)
	at io.netty.channel.ChannelInitializer.handlerAdded(ChannelInitializer.java:112)
	at io.netty.channel.AbstractChannelHandlerContext.callHandlerAdded(AbstractChannelHandlerContext.java:938)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAdded0(DefaultChannelPipeline.java:609)
	at io.netty.channel.DefaultChannelPipeline.access$100(DefaultChannelPipeline.java:46)
	at io.netty.channel.DefaultChannelPipeline$PendingHandlerAddedTask.execute(DefaultChannelPipeline.java:1463)
	at io.netty.channel.DefaultChannelPipeline.callHandlerAddedForAllHandlers(DefaultChannelPipeline.java:1115)
	at io.netty.channel.DefaultChannelPipeline.invokeHandlerAddedIfNeeded(DefaultChannelPipeline.java:650)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.register0(AbstractChannel.java:502)
	at io.netty.channel.AbstractChannel$AbstractUnsafe.access$200(AbstractChannel.java:417)
	at io.netty.channel.AbstractChannel$AbstractUnsafe$1.run(AbstractChannel.java:474)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:164)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:472)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:500)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at io.ktor.server.netty.EventLoopGroupProxy$Companion$create$factory$1$1.run(NettyApplicationEngine.kt:227)
	at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
	at java.base/java.lang.Thread.run(Thread.java:832)