use early-commands fetch mac based user-data didnt work

[dahai]

Recently, I have been testing ubuntu-live-20.04 autoinstallation with PXE and a large amount of Servers.
so i need to customize user-data for every single Server when provisioning with PXE.here is my ipxe file:

autoinstall:
  version: 1
  identity:
    hostname: pxe-client
    password: $6$FhcddHFVZ7ABA4Gi$9l4yURWASWe8xEa1jzI0bacVLvhe3Yn4/G3AnU11K3X0yu/mICVRxfo6tZTB2noKljlIRzjkVZPocdf63MtzC0
    realname: pxe
    username: pxe
  keyboard: {layout: hr, toggle: toggle, variant: ""}
  early-commands:
    - set e
    - curl -G -o /autoinstall.yaml http://192.168.1.3:9030/api/current/templates/user-data.yaml -d "macs=6c:92:bf:b4:85:0a"
  locale: en_US
  network:
    network:
      version: 2
      ethernets:
        eth0:
          dhcp4: yes
          dhcp6: no

after PXE boot , it runs into autoinstallation environment then download my customized "auotoinstall.yaml" from my own server which defined my own user-data based on Server's PXE macaddress.then the subiquity goes wrong,so i use the customized "autoinstall.yaml" to test installation it was successfull, i ran out of my mind which went wrong ?

here is the crash logs:

 2021-06-24 03:37:35,124 DEBUG subiquitycore.netplan:111 config for eth0 = {'critical': True, 'dhcp-identifier': 'mac', 'dhcp4': True, 'match': {'macaddress': '6c:92:bf:b4:85:0a'}, 'nameservers': {'addresses': ['192.168.1.3']}, 'set-name': 'eth0'}
 2021-06-24 03:37:35,124 DEBUG subiquitycore.utils:74 arun_command called: ['systemctl', 'mask', '--runtime', 'systemd-networkd.service', 'systemd-networkd.socket']
 2021-06-24 03:37:35,130 ERROR subiquity.server.controllers.mirror:101 geoip lookup failed
 Traceback (most recent call last):
   File "/snap/subiquity/2280/usr/lib/python3/dist-packages/urllib3/connection.py", line 144, in _new_conn
     (self.host, self.port), self.timeout, **extra_kw)
   File "/snap/subiquity/2280/usr/lib/python3/dist-packages/urllib3/util/connection.py", line 60, in create_connection
     for res in socket.getaddrinfo(host, port, family, socket.SOCK_STREAM):
   File "/snap/subiquity/2280/usr/lib/python3.6/socket.py", line 745, in getaddrinfo
     for res in _socket.getaddrinfo(host, port, family, type, proto, flags):
 socket.gaierror: [Errno -3] Temporary failure in name resolution

 During handling of the above exception, another exception occurred: