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<@U7FA5SHKQ> can you debug the traffic and then reproduce with curl?

Oh, well. It seems like my bad, as I forgot to open connection for the URL I'm using.

which HTTP client are you using? You probably shouldn't be needing to open url connections unless you're writing an HTTP client!

Well, I use `Fuel` in a string-extension way. It seems they use their own: <https://github.com/kittinunf/Fuel/blob/master/fuel/src/main/kotlin/com/github/kittinunf/fuel/toolbox/HttpClient.kt>

Hm, if I use it object way like this:
`<http://Fuel.post|Fuel.post>(url).[...]` it works without opening the connection.

Okay, not it works both ways I'm totally lost, because it seems to me as the code I had 2 hours ago not working in the same case :sweat_smile:

<@U7FA5SHKQ> - Sounds like Fuel isn't properly tested/mature. At this point I would recommend going with OkHttp (<http://square.github.io/okhttp/>). If you have used Vert.x before then the *vertx-web-client* (<http://vertx.io/docs/vertx-web-client/kotlin/>) is another good option with *solid* Kotlin support.

Probably not worth pulling vert.x as a dependency for a simple HTTP call

Cedric - True unless *vertx-core* is used in the project, or the project relies on a server side project written using Vert.x.