ConflictInterceptor.kt

 private fun getConflictInterceptor(context: Context): Interceptor? {

        conflictInterceptor?.let {
            return it
        } ?: kotlin.run {
            conflictInterceptor = Interceptor {
                val request = it.request()

                //all the HTTP work happens, producing a response to satisfy the request.
                val response = it.proceed(request)

                //To access the response body twice, clone the buffer before reading it.
                //By that the original buffer is neither emptied nor closed and we can read it twice.
                val responseBody = response.body()
                val bufferedSource = responseBody?.source()
                bufferedSource?.request(Long.MAX_VALUE)
                val buffer = bufferedSource?.buffer()
                val responseBodyString = buffer?.clone()?.readString(Charset.forName("UTF-8")) ?: ""

                //To see for conflict, "VoyagerConflict" which comes in the message is searched for.
                if (responseBodyString.contains("VoyagerConflict"))
                    showToast(context)

                return@Interceptor response
            }
        }
        return conflictInterceptor
    }