Hello KTor Team! I wanted to check with on couple of things related to

ktor-client

and the best practices around it. 1. Whats the right way to re-use connections (or use a connection pool) with

CIOEngine

? I am using the following configs:

engine {
    maxConnectionsCount = 250
    pipelining = true
    endpoint {
      maxConnectionsPerRoute = 100
      pipelineMaxSize = 20
      keepAliveTime = 5000
      connectTimeout = 5000
      connectAttempts = 5
      threadsCount = 20
    }
  }

It looks like without the

pipielining = true

flag, new connections were being created for every request/call. Are these sufficient or is there any other config that I would need to set to effectively re-use connections? 2. Whats the recommended way to use

client.close()

or

client.use {}

- Especially when we are sharing/re-using the

HttpClient

I went through the docs here - https://ktor.io/docs/client.html#close-client With a shared

HttpClient

- if I used

client.use {}

- i was seeing errors on subsequent requests after some initial successful requests. Errors like -

kotlinx.coroutines.JobCancellationException: Parent job is Completed; job=JobImpl{Completed}@5e4f8454

So, when should this actually be used? During shutdown to release/cleanup the resources? Thanks so much for your help with this!

2. The

use

extension function just executes the block and then closes a client. So if you want to share a client make sure to close it after making all necessary requests.

@Aleksei Tirman [JB] thanks so much for your inputs! Oh! I see, thanks for the note on CIO engine.

OkHttp engine could be used for JVM (non Android).

Wondering what would be your recommendation for a production ready engine that can support connection pooling/reuse?

I don't actually know. @e5l could you please help with advice?

OkHttp engine could be used for JVM (non Android).

Thanks @Aleksei Tirman [JB]!

Apache engine is also good option

Gotcha! Thanks @e5l !

I have been using ktor apache since this year, after some tuning options I can say it has a good performance