crash when getting some url

[vricosti]

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Description of the bug or feature request
I am starting wifipumpin3 to capture the commands sent by the FreeTéléc mobie application on IOS with the following pulp script:

set interface wlo1
set ssid Pumpkin
set security true
set security.wpa_algorithms CCMP
set security.wpa_sharedkey 314123789
set proxy pumpkinproxy
ignore pydns_server

Then I connect to the Pumpkin ssid on my iPhone (maybe I should also connect my TV...) and then I start the launch the application and I let it discover my internet/tv box and I can see the following crash:

[  sniffkin3  ] 15:30:57  - [ 10.0.0.21 > 212.27.40.254 ] GET hd1.freebox.fr/pub/channels 
 [  sniffkin3  ] 15:30:57  - [ 10.0.0.21 > 212.27.40.253 ] GET hd2.freebox.fr/pub/channels 
 [  pumpkinproxy  ] 15:31:27  - Unhandled Error
Traceback (most recent call last):
  File "/usr/local/lib/python3.10/dist-packages/wifipumpkin3/plugins/bin/sslstrip3.py", line 171, in main
    init(sys.argv[1:])
  File "/usr/local/lib/python3.10/dist-packages/wifipumpkin3/plugins/bin/sslstrip3.py", line 167, in init
    reactor.run()
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/base.py", line 695, in run
    self.mainLoop()
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/base.py", line 705, in mainLoop
    self.runUntilCurrent()
--- <exception caught here> ---
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/base.py", line 1090, in runUntilCurrent
    call.func(*call.args, **call.kw)
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/tcp.py", line 487, in failIfNotConnected
    self.connector.connectionFailed(failure.Failure(err))
  File "/usr/local/lib/python3.10/dist-packages/twisted/internet/base.py", line 1297, in connectionFailed
    self.factory.clientConnectionFailed(self, reason)
  File "/usr/local/lib/python3.10/dist-packages/wifipumpkin3/plugins/external/sslstrip/ServerConnectionFactory.py", line 44, in clientConnectionFailed
    self.headers["host"],
builtins.KeyError: 'host'

To Reproduce
Steps to reproduce the behavior:

1. Start wifipumpkin3 with the [
   pumpkin.pulp.txt
   ](url)
2. sudo wifipumpkin3 --pulp pumpkin.pulp
3. Download FreeTéléc on iOS
4. Start FreeTéléc and start to discover your box/tv

Expected behavior
I expect no crash ins the logs

Desktop (please complete the following information):

• wifipumpkin3 v1.1.7 branch: main.
• Virtual Machine: no
• Operating System: Ubuntu 22.04.4 LTS
• version: 22.04

[vricosti]

Actually the host is not reachable so in this case instead of an exception it would be better to catch and display something like: host cannot be reached ....
It seems you already have fixed this bug but something went wrong ...