I am writing a CLI JVM program with Ktor client (using OkHttp engine behind) and found that after us...

# ktor

[ericksli]

I am writing a CLI JVM program with Ktor client (using OkHttp engine behind) and found that after using Ktor client to make a HTTP call the program exit with long delay

For example, if my program contain these lines:

val res = httpClient.get("<https://example.com>").bodyAsText()
println(res)

The Process finished with exit code 0 will show up after ~1 min of printing out the response body

It does not help even I call httpClient.close() afterwards

What is the reason why it takes so much time to finish the program?

[ericksli]

Just tried with CIO engine, the program finished right after printing the response body

[Chrimaeon]

OkHttp is an Android engine. That will not work in a plain JVM CLI client.

https://api.ktor.io/ktor-client/ktor-client-okhttp/io.ktor.client.engine.okhttp/-ok-http/index.html

[ericksli]

But it should work for JVM as well as OkHttpClient itself is targeting for JVM as well

[Chrimaeon]

Then enable logging in okhttp and check what’s going wrong.

[ericksli]

If I just write

okhttpClient.newCall(Request.Builder().url("<https://example.com>").method("GET", null).build()).execute().use {
            println(it.body?.string())
        }

The Process finished with exit code 0 prints out quickly after printing out the response body.

Looks like an issue in Ktor client

[Aleksei Tirman [JB]]

You can close the HTTP client to avoid blocking the thread.

[ericksli]

Even calling httpClient.close() does not help

[ephemient]

okHttpClient.shutdown()

[ericksli]

it doesn't help

[Aleksei Tirman [JB]]

On my machine, the following program exits after making a request:

val client = HttpClient(OkHttp)
client.get("<https://httpbin.org/get>")
client.close()