OkHttp Client (Java interop)

// build.gradle.kts:
//   implementation("com.squareup.okhttp3:okhttp:4.12.0")

import okhttp3.*
import okhttp3.MediaType.Companion.toMediaType
import okhttp3.RequestBody.Companion.toRequestBody
import java.util.concurrent.TimeUnit

val client = OkHttpClient.Builder()
    .connectTimeout(5,  TimeUnit.SECONDS)
    .readTimeout   (10, TimeUnit.SECONDS)
    .build()

fun get(url: String): String {
    val req = Request.Builder()
        .url(url)
        .header("Accept", "application/json")
        .build()

    client.newCall(req).execute().use { resp ->
        if (!resp.isSuccessful) throw RuntimeException("HTTP ${resp.code}")
        return resp.body!!.string()
    }
}

fun postJson(url: String, json: String): String {
    val body = json.toRequestBody("application/json".toMediaType())
    val req = Request.Builder().url(url).post(body).build()
    client.newCall(req).execute().use { resp ->
        return resp.body!!.string()
    }
}

fun main() {
    println(get("https://api.github.com").take(100))
}