Ktor 1.3.1 Fails File Upload with MalformedInputException

Hi. I am using Ktor Client with version 1.3.1 for MPP

I have been using Ktor version 1.2.6 in my MPP project with Kotlin version 1.3.61 and it was working fine, so I was able to upload files without a problem. Later I update Kotlin version to 1.3.72 which forced me to update Ktor version 1.3.1 as version 1.2.6 was compiled with Kotlin version 1.3.61 which IDE can not compile with Kotlin plugin 1.3.72. After that file upload call started to give me the following exception.

2020-05-02 17:35:35.186 14564-14671/com.inivo.client.debug E/AndroidRuntime: FATAL EXCEPTION: ktor-android-dispatcher-worker-2
    Process: com.inivo.client.debug, PID: 14564
    io.ktor.utils.io.charsets.MalformedInputException: Input length = 1
        at io.ktor.utils.io.charsets.CharsetJVMKt.throwExceptionWrapped(CharsetJVM.kt:323)
        at io.ktor.utils.io.charsets.CharsetJVMKt.decode(CharsetJVM.kt:199)
        at io.ktor.utils.io.charsets.EncodingKt.decode(Encoding.kt:101)
        at io.ktor.utils.io.core.StringsKt.readText(Strings.kt:251)
        at io.ktor.utils.io.core.StringsKt.readText$default(Strings.kt:250)
        at io.ktor.client.features.logging.Logging$logRequestBody$2$1.invokeSuspend(Logging.kt:111)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
        at kotlinx.coroutines.EventLoop.processUnconfinedEvent(EventLoop.common.kt:69)
        at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:184)
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:108)
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:307)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:317)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeWith(CancellableContinuationImpl.kt:249)
        at io.ktor.utils.io.ByteBufferChannel.resumeWriteOp(ByteBufferChannel.kt:2210)
        at io.ktor.utils.io.ByteBufferChannel.bytesRead(ByteBufferChannel.kt:930)
        at io.ktor.utils.io.ByteBufferChannel.readAsMuchAsPossible(ByteBufferChannel.kt:544)
        at io.ktor.utils.io.ByteBufferChannel.readAvailable$suspendImpl(ByteBufferChannel.kt:606)
        at io.ktor.utils.io.ByteBufferChannel.readAvailable(Unknown Source:0)
        at io.ktor.utils.io.jvm.javaio.WritingKt.copyTo(Writing.kt:21)
        at io.ktor.utils.io.jvm.javaio.WritingKt.copyTo$default(Writing.kt:12)
        at io.ktor.client.engine.android.AndroidClientEngineKt.writeTo(AndroidClientEngine.kt:112)
        at io.ktor.client.engine.android.AndroidClientEngine.execute(AndroidClientEngine.kt:79)
        at io.ktor.client.engine.HttpClientEngine$executeWithinCallContext$2.invokeSuspend(HttpClientEngine.kt:83)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:56)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:738)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

I am uploading a file like this.

override suspend fun sendImageAsync(
        token: String,
        file: File,
        fileType: String,
        id: Long
    ): Unit = client.request {
        fullUrl("${RestApi.SEND_IMAGE}/${id}")
        method = HttpMethod.Post
        body = MultiPartFormDataContent(
            formData {
                append(
                    "image",
                    file.fileData.bytes,
                    headers = Headers.build {
                        append(HttpHeaders.ContentType, "image/jpg")
                        append(
                            HttpHeaders.ContentDisposition,
                            "filename=${file.name}"
                        )
                        append("Connection", "Close")
                    }
                )
            }
        )
        header(HttpHeaders.Connection, "close")
        header(HttpHeaders.Authorization, makeAuthToken(token))
    }

Here file data is just an object which keeps File data as a byte array so by that I can convert image to byte array (either from Android / IOS) and upload it.

Thank you very much for your help in advanced.

[namig-tahmazli]

Hi @e5l , I am sorry for the late reply. I can confirm that the issue still appears with Ktor version 1.3.2.

[rsinukov]

fixed by https://github.com/ktorio/ktor/pull/2064