hi, i have a little issue with Ktor HttpClient whe...

# ktor

[samuele794]

hi, i have a little issue with Ktor HttpClient when receive Json response

io.ktor.client.call.NoTransformationFoundException: No transformation found: class io.ktor.utils.io.ByteBufferChannel -> class it.codingbunker.tbs.common.client.discord.model.DiscordOAuth2User

client setting

client.config {
            developmentMode = true
            install(Logging)
            defaultRequest {
                host + BASE_API_URL
                accept(ContentType.Application.Json)
            }
            install(JsonFeature) {
                serializer = KotlinxSerializer(
                    kotlinx.serialization.json.Json {
                        prettyPrint = true
                        isLenient = true
                        ignoreUnknownKeys = true
                    }
                )
            }
        }

and i receive correct headers

[Aleksei Tirman [JB]]

Could you please share the address of an endpoint if it's a public one?

[samuele794]

endpoint is

<https://discord.com/api/v9/users/@me>

for call this you need a Discord Account and get OAuth2 Token

[Aleksei Tirman [JB]]

@samuele794 Unfortunately, I cannot reproduce your problem. Here is the data in a log:

19:10:58.291 [main] INFO io.ktor.client.HttpClient - REQUEST: <https://discord.com/api/v9/users/@me>
19:10:58.292 [main] INFO io.ktor.client.HttpClient - METHOD: HttpMethod(value=GET)
19:10:58.292 [main] INFO io.ktor.client.HttpClient - COMMON HEADERS
19:10:58.293 [main] INFO io.ktor.client.HttpClient - -> Accept: application/json; application/json
19:10:58.293 [main] INFO io.ktor.client.HttpClient - -> Accept-Charset: UTF-8
19:10:58.293 [main] INFO io.ktor.client.HttpClient - -> Authorization: Bearer <token>
19:10:58.293 [main] INFO io.ktor.client.HttpClient - CONTENT HEADERS
19:10:58.293 [main] INFO io.ktor.client.HttpClient - -> Content-Length: 0
19:10:58.676 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - RESPONSE: 200 OK
19:10:58.676 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - METHOD: HttpMethod(value=GET)
19:10:58.676 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - FROM: <https://discord.com/api/v9/users/@me>
19:10:58.676 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - COMMON HEADERS
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Alt-Svc: h3-27=":443"; ma=86400, h3-28=":443"; ma=86400, h3-29=":443"; ma=86400, h3=":443"; ma=86400
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> CF-Cache-Status: DYNAMIC
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> CF-Ray: 65d3df736fea7a64-DME
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Connection: keep-alive
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Content-Type: application/json
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Date: Thu, 10 Jun 2021 16:10:58 GMT
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Expect-CT: max-age=604800, report-uri="<https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct>"
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> NEL: {"report_to":"cf-nel","max_age":604800}
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Report-To: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v2?s=Uxeq9mT%2BiNiBv78pDBLQiZWHiBO4K%2BJ%2BZoOHpx1OSfmcPGYmf5tYF%2FNdGhiPO2FlXpqaAfrU3aYIGJb1K0QY15hai04r8Is4WxWoYdWituaB9sdOsx21uw%3D%3D"}],"group":"cf-nel","max_age":604800}
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Server: cloudflare
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Set-Cookie: __dcfduid=62e1d8e1a6374d5d8a4d2e008940223e; Expires=Tue, 09-Jun-2026 16:10:58 GMT; Max-Age=157680000; Secure; HttpOnly; Path=/
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Strict-Transport-Security: max-age=31536000; includeSubDomains; preload
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Transfer-Encoding: chunked
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> Via: 1.1 google
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> X-Content-Type-Options: nosniff
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> cf-request-id: 0a9849fc2200007a64d6222000000001
19:10:58.677 [ktor-apache-dispatcher-worker-1] INFO io.ktor.client.HttpClient - -> x-envoy-upstream-service-time: 8
{"id": "532546415755395082", "username": "Aleksei", "avatar": null, "discriminator": "5612", "public_flags": 0, "flags": 0, "locale": "ru", "mfa_enabled": false, "email": "<mailto:[e-mail]|[e-mail]>", "verified": true}

I did a request like this:

val r = client.get<String>("<https://discord.com/api/v9/users/@me>") {
        header("Authorization", "Bearer <token>")
    }