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val builder = OkHttpClient.Builder()
.readTimeout(READ_TIMEOUT, TimeUnit.SECONDS)
.connectTimeout(CONNECT_TIMEOUT, TimeUnit.SECONDS)
.connectionPool(ConnectionPool(0, 5, TimeUnit.MINUTES))
//ConnectionPool(0, 5, TimeUnit.MINUTES) is key code, set maxIdleConnections as 0, to avoid the SocketTimeoutException by multiplex