How to increase "receive buffer size"

I am trying to host a Flask API on docker/ Podman (tried on both). It works as expected when directly run on macOS using python3 command. But when I try to dockerize it, it throws an error and some logs like

2024-07-30 03:33:20,661 - INFO - Tunnel Output: 2024-07-30T03:32:58Z INF Starting metrics server on 127.0.0.1:46585/metrics
2024-07-30 03:33:21,669 - INFO - Tunnel Output: 2024/07/30 03:32:58 failed to sufficiently increase receive buffer size (was: 208 kiB, wanted: 7168 kiB, got: 416 kiB). See https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes for details.
2024-07-30 03:33:21,671 - INFO - New Cloudflare URL: https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes
2024-07-30 03:33:21,672 - INFO - My API URL: http://127.0.0.1:5000
2024-07-30 03:33:21,672 - INFO - My Cloudflare URL: https://github.com/quic-go/quic-go/wiki/UDP-Buffer-Sizes

I tried following but no success (by changing "/etc/sysctl.conf":

kern.ipc.maxsockbuf=16777216
net.inet.tcp.win_scale_factor=8
net.inet.tcp.autorcvbufmax=33554432
net.inet.tcp.autosndbufmax=33554432
net.inet.udp.recvspace=8388608
net.inet.udp.maxdgram=8388608

I tried

def set_socket_buffers(sock, recv_buf_size, send_buf_size):
    # Set the receive buffer size
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, recv_buf_size)
    # Set the send buffer size
    sock.setsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF, send_buf_size)

    # Verify the buffer sizes
    actual_recv_buf_size = sock.getsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF)
    actual_send_buf_size = sock.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)

    logging.info(f"Requested receive buffer size: {recv_buf_size} bytes")
    logging.info(f"Actual receive buffer size: {actual_recv_buf_size} bytes")
    logging.info(f"Requested send buffer size: {send_buf_size} bytes")
    logging.info(f"Actual send buffer size: {actual_send_buf_size} bytes")

if __name__ == "__main__":
    print("Starting the main process...")

    # Define the path to the log file
    log_file_path = "logs.log"

    # Clear the log file before starting logging
    clear_log_file(log_file_path)

    # Configure logging
    logging.basicConfig(
        filename=log_file_path,
        level=logging.DEBUG,
        format="%(asctime)s - %(levelname)s - %(message)s",
    )
    logging.info("Starting the main process...")

    # Define the desired buffer sizes
    recv_buf_size = 8388608  # 8 MB
    send_buf_size = 8388608  # 8 MB

    # Create a UDP socket
    udp_sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)

    # Set the socket buffers
    set_socket_buffers(udp_sock, recv_buf_size, send_buf_size)

    main()

On directly running (using python3 command), the values set as expected but when running on Docker logs come out as:

2024-07-30 03:32:50,987 - INFO - Requested receive buffer size: 8388608 bytes
2024-07-30 03:32:50,987 - INFO - Actual receive buffer size: 425984 bytes
2024-07-30 03:32:50,987 - INFO - Requested send buffer size: 8388608 bytes
2024-07-30 03:32:50,987 - INFO - Actual send buffer size: 425984 bytes

So, I want to know how to increase UDP Receive buffer size for dockerized applications.

Thanks!