Did anyone encounter `Broken delimiter occurred` in ktor ser

Question

Did anyone encounter `Broken delimiter occurred` in ktor server netty engine i have a super simple python script which uploads files of size 2 4MB with method PUT and it works well in general but in like 1 out of 2000 cases i get this error message

bitkid · Answer

python basically does ```files = upload file open file name rb requests put <http s 8080 api matrices s upload> api endpoint cleaned name files=files timeout=None ```

bitkid · Answer

that s the line where the error message comes from

bitkid · Answer

bitkid · Answer

the error message is not very helpful

bitkid · Answer

my guess is that python chooses a delimiter which ktor doesn t like but i have no way of knowing slightly smiling face

bitkid · Answer

it seems it only happens when there are multiple clients uploading data concurrently but also hard to verify

bitkid · Answer

```2019 09 17 11 43 22 699 nioEventLoopGroup 4 2 ERROR Application Broken delimiter occurred java io IOException Broken delimiter occurred at kotlinx coroutines io DelimitedKt$skipDelimiterSuspend$2 invokeSuspend Delimited kt 58 at kotlinx coroutines io DelimitedKt$skipDelimiterSuspend$2 invoke Delimited kt at kotlinx coroutines io ByteBufferChannel lookAheadSuspend ByteBufferChannel kt 1838 at kotlinx coroutines io DelimitedKt skipDelimiterSuspend Delimited kt 56 at kotlinx coroutines io DelimitedKt skipDelimiter Delimited kt 51 at io ktor http cio MultipartKt boundary Multipart kt 160 at io ktor http cio MultipartKt$parseMultipart$1 invokeSuspend Multipart kt 319 at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 33 at kotlinx coroutines DispatchedContinuation resumeWith Dispatched kt 108 at kotlinx coroutines io internal CancellableReusableContinuation resumeWith CancellableReusableContinuation kt 93 at kotlinx coroutines io ByteBufferChannel resumeWriteOp ByteBufferChannel kt 2230 at kotlinx coroutines io ByteBufferChannel bytesRead ByteBufferChannel kt 877 at kotlinx coroutines io ByteBufferChannel readAsMuchAsPossible ByteBufferChannel kt 438 at kotlinx coroutines io ByteBufferChannel readAvailable ByteBufferChannel kt 571 at kotlinx coroutines io ByteBufferChannel readAvailableSuspend ByteBufferChannel kt 605 at kotlinx coroutines io ByteBufferChannel$readAvailableSuspend$2 invokeSuspend ByteBufferChannel kt at kotlin coroutines jvm internal BaseContinuationImpl resumeWith ContinuationImpl kt 33 at kotlinx coroutines DispatchedTask run Dispatched kt 241 at io netty util concurrent AbstractEventExecutor safeExecute AbstractEventExecutor java 163 at io netty util concurrent SingleThreadEventExecutor runAllTasks SingleThreadEventExecutor java 416 at io netty channel nio NioEventLoop run NioEventLoop java 515 at io netty util concurrent SingleThreadEventExecutor$5 run SingleThreadEventExecutor java 918 at io netty util internal ThreadExecutorMap$2 run ThreadExecutorMap java 74 at io netty util concurrent FastThreadLocalRunnable run FastThreadLocalRunnable java 30 at java base java lang Thread run Thread java 834 ```

bitkid · Answer

should i create a ticket for that