`okhttp3.RequestBody.Companion#gzip` throws `java.lang.IllegalStateException: closed` if used in `MultipartBody`

[korniltsev]

Reproducer . Tried it on 5.0.0-alpha.11

I believe I can workaround it in our project locally by creating a vendored copy of GzipSink which does not close upstream sink but flushes it with some help of ugly dirty java tricks accessing kotlin internals it should work but it would be nice to be able to use the original extension method in MultipartBody

Stacktrace:

Exception in thread "main" java.lang.IllegalStateException: closed at okio.RealBufferedSink.write(RealBufferedSink.kt:176) at okhttp3.MultipartBody.writeOrCountBytes(MultipartBody.kt:162) at okhttp3.MultipartBody.writeTo(MultipartBody.kt:99) at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.kt:64) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109) at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.kt:34) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109) at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.kt:95) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109) at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.kt:84) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109) at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.kt:65) at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.kt:109) at okhttp3.internal.connection.RealCall.getResponseWithInterceptorChain$okhttp(RealCall.kt:205) at okhttp3.internal.connection.RealCall.execute(RealCall.kt:158) at MainKt.main(Main.kt:22)

[yschimke]

Thanks, copying the reproducer here as it looks quite straight forward

    val client = OkHttpClient()

    val body = MultipartBody.Builder()
        .setType(MultipartBody.FORM)
        .addPart("part1".toRequestBody().gzip())
        .addPart("part2".toRequestBody().gzip())
        .build()

    val req = Request.Builder()
        .post(body)
        .url("http://localhost:4040/ingest")
        .build()