An exception occurred with printer: invalid literal for int() with base 10: '//alprinter.xy.com'

[oxhelili]

I have a printer accessed from cloudflared platform with alprinter.xy.com. I try to ping this url from my server and can reach it, even from request the status is 200.

Problem: when I try to send print instruction from my python code the above error in title is shown.
The code is as below:

    backend = 'network'    # 'pyusb', 'linux_kernal', 'network'
    model = 'QL-820NWB'
    # URL of the printer service through the Cloudflared Tunnel
    url = 'https://alprinter.xy.com'

    printer = url

    qlr = BrotherQLRaster(model)
    qlr.exception_on_warning = True

    if isinstance(path, list):
        imgs = [Image.open(path_pwd + '/media/' + path1) for path1 in path]
    else:
        imgs = [Image.open(path_pwd + '/media/' + path)]

    # Converting print instructions for the Brother printer
    instructions = convert(
            qlr=qlr,
            images=imgs,    #  Takes a list of file names or PIL objects.
            label='62',
            rotate='0',    # 'Auto', '0', '90', '270'
            # threshold=100.0,    # Black and white threshold in percent.
            red=False,
            dither=False,
            compress=False,
            dpi_600=False,
            hq=True,    # False for low quality.
            cut=True
    )
   
    try:
        msg=send(instructions=instructions, printer_identifier= printer, backend_identifier=backend, blocking=True)
        if msg['outcome']=='error':
            messages.error(request, 'An exception occurred with printer: ' + str(msg['printer_state']['errors'][0]))    
        elif msg['outcome']=='printed':
            messages.info(request, 'QR code was printed successfully!')

    except Exception as error:
        # handle the exception
        logger.error(f'An exception occurred with printer: {error}')
        messages.error(request, 'An exception occurred with printer: ' + str(error)) 

Please tell me is this the wright way to send print instructions in this case?
It's urgent for me.
Thank you

[FriedrichFroebel]

Please provide the full stacktrace and full executable code - at least backend appears to be not set.

[oxhelili]

[02/Jul/2024 12:30:46] "GET /admin/store/mobile/ HTTP/1.1" 200 38187
[02/Jul/2024 12:30:47] "GET /admin/jsi18n/ HTTP/1.1" 200 3343
2024-07-02 12:30:53,799 (WARNING) - brother_ql.conversion - Need to resize the image...
2024-07-02 12:30:53,814 (ERROR) - store.admin - An exception occurred with printer: invalid literal for int() with base 10: '//alprinter.xy.com'
[02/Jul/2024 12:30:53] "POST /admin/store/mobile/ HTTP/1.1" 302 0
[02/Jul/2024 12:30:53] "GET /admin/store/mobile/ HTTP/1.1" 200 38408
[02/Jul/2024 12:30:54] "GET /admin/jsi18n/ HTTP/1.1" 200 3343

Above is the full stacktrace and I updated the executable code.
Thanks @FriedrichFroebel

[FriedrichFroebel]

This is no stacktrace - this is your application log.

You probably should have a look at the CLI help or code: https://github.com/pklaus/brother_ql/blob/master/brother_ql/backends/network.py You will see that a network-based setup expects either a hostname or IP address, optionally suffixed by a port and optionally prefixed by tcp:// (the printer itself does not support HTTP(S), but only plain TCP). This means that in your setup http is considered the hostname and //alprinter.xy.com the port.

[oxhelili]

I understand that this way, HTTP(S), I can not access the brother printer.

I am explaining the situation, maybe there is another way to access it. I am kindly asking you:
I have the printer connected in WLAN way, accessible with IP and I have an app deployed in a local server in different LAN from printer and shared in internet via cloudflared.
When the app is open from any device(different LANs), I want to print in brother printer.
Currently I can do this but only in the case when server and printer are in the same LAN.
Is it possible and supported from printer what I am asking?
Thank you

[FriedrichFroebel]

I have never tried this and never used the network backend myself, but it should work in theory. You just have to ensure that you are not specifying the http(s):// prefix for your printer address with brother_ql and that there is no firewall which would block generic TCP connections on the desired port in-between.