OkHttp VS okio

Retrofit in combination with OkHttp for fetching data from server (which hopefully already exists)

OkHttp

Being more familiar with Android development only, I mainly use https://github.com/square/okhttp/tree/master/mockwebserver

Retrofit is the best library that lets you connect to HTTP-based API services from your Android applications. It leverages the OkHttp library’s core functionality, adding a bunch of features to it while eliminating the boilerplate code.

Use Retrofit or anything else that builds on OkHttp. If you do end up needing some features that Cronet supports but OkHttp doesn't (such as HTTP/3), just write an interceptor or use google/cronet-transport-for-okhttp.

Even as of 2022, there are networks out there that have broken/misconfigured IPv6, and there most likely always will be. Some wireless carriers and ISPs support it, but in some cases, people have old or improperly-configured routers and devices. Patchy IPv6 support is less of a problem on iOS and the web these days since those clients have support for dynamically falling back on IPv4 when IPv6 fails. After more research, we realized that Android didn’t have this “dual-stack” IP support, and neither did our preferred networking library, OkHttp. This explained why the content-loading issues only surfaced on Android, and why it took some additional digging to uncover the root cause.

Working with the reddit infrastructure team, we did more testing and built high confidence that this last IPv6 theory was indeed the cause of users’ content-loading problems. We assessed our usage of OkHttp and checked if there were any upcoming plans to improve support. OkHttp did have an open ask for “Happy Eyeballs” #506, but no known plans to implement it. Out of due diligence, we also assessed other network libraries– but knew that moving off OkHttp would be a radical change, indeed. We read the RFC 8305, “Happy Eyeballs algorithm for dual-stack IPv4/IPv6”, and thought “wow, we don’t want to implement this ourselves.” And as we were studying that open OkHttp issue and thinking “If only they would…”

Your app would request data from the backend inside it's domain layer. As the other commenter mentioned, Retrofit is a commonly used library for interfacing with REST APIs, which is built on top of OkHttp (a more generic HTTP client).

OkHttp

Yeah Kotlin's own standard library is a lot smaller than Java's currently so you'll need to use something third-party for this. Okio is a popular option https://square.github.io/okio/ it has a Buffer type which is pretty similar to Java's ByteBuffer

Use okio, it is Multiplatform now. I use this for my own library KStore

For networking, file IO, and streams in general, there's Korio and for Java; for just networking, there's LiteNetLib for C#; for what looks like data streams in general, there's Okio also for Java; and Tokio for multi-threaded IO in Rust.

Okio is nice for input/output streams, and sockets.

Sounds like you want https://square.github.io/okio/

Try OKIO: https://github.com/square/okio/

On JVM, there is plenty of existing solution already on for multiplatform uses I'd suggest checking amazing Okio library by Square, that seems to cover most of basic use-cases.

OkHttp depends on Square’s Okio and Kotlin to provide great performance and backwards-compatibility. It’s really easy to use, but it can be hard if you have to work on complicated stuff like mid-connection checks or proxy tunneling. Plus, it won’t chart the results directly into objects. It has been developed with a simplicity mind-set. You can find more about OkHttp here.