Dandjinh

I wanna use DMA RX and RTO/RX END interrupt to get variable length data. Code is like below ```c hosal_uart_init() hosal_uart_callback_set(HOSAL_UART_RX_CALLBACK, _rx_callback) hosal_uart_ioctl(HOSAL_UART_MODE_SET, HOSAL_UART_MODE_INT) hosal_uart_ioctl(HOSAL_UART_DMA_RX_START) ... waiting rx int ......

希望添加通过环境变量设置反代的子路径。 现在貌似只能在'/'下访问，不能在nginx的子路径下访问。