An OKHttp Interceptor that prints the response of a request to the console.

ResponseBodyLogger.kt

import com.squareup.okhttp.Interceptor
import com.squareup.okhttp.MediaType
import com.squareup.okhttp.Response
import com.squareup.okhttp.ResponseBody
import okio.BufferedSource
import okio.GzipSource
import okio.Okio

class ResponseBodyLogger : Interceptor {
    override fun intercept(chain: Interceptor.Chain): Response {
        val contentEncoding: String = "content-encoding"
        val request = chain.request()
        var response = chain.proceed(request)

        var content: String? = null
        val body: ResponseBody? = response.body()
        if (body != null) {
            val contentType: MediaType = body.contentType()
            val contentEncoding = response.header(contentEncoding)
            if ("gzip" == contentEncoding) {
                val buffer: BufferedSource = Okio.buffer(GzipSource(body.source()))
                content = buffer.readUtf8()
                val wrappedBody: ResponseBody = ResponseBody.create(contentType, content)
                response = response.newBuilder().removeHeader(contentEncoding).body(wrappedBody).build()
            } else {
                content = body.string()
                val wrappedBody: ResponseBody = ResponseBody.create(contentType, content)
                response = response.newBuilder().body(wrappedBody).build()
            }
        }
        var protocol = response.protocol().name.replaceFirst("_".toRegex(), "/")
        protocol = protocol.replace('_', '.')
        val httpLine = "" + protocol + ' ' + response.code()
        println("OkHttp: ${String.format("%s\n%s\n\n%s", httpLine, response.headers(), content)}")

        return response
    }

}

Based upon https://gist.github.com/erickok/e371a9e0b9e702ed441d?permalink_comment_id=3810471#gistcomment-3810471 @flocsy