private fun HttpRequestData.convertToOkHttpRequest(callContext: CoroutineContext): Request {
    val builder = Request.Builder()

    with(builder) {
        url(url.toString())

        forEachHeader(::addHeader)

        val bodyBytes = if (HttpMethod.permitsRequestBody(method.value)) {
            body.convertToOkHttpBody(callContext)
        } else {
            null
        }

        method(method.value, bodyBytes)
    }

    return builder.build()
}