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[Falco]

@zengyunsi

But the header can not pass non-ASCII characters

It can, as proven by @supermathie above:

cURL

@supermathie

○ → curl -s -L -H 'api-key: «redacted»' -H 'api-username: 运思' https://try.discourse.org/u/运思/notifications.json | jq '.users[0]'
{
  "id": 41,
  "username": "运思",
  "name": "Michael Brown",
  "avatar_template": "/user_avatar/try.discourse.org/运思/{size}/208_2.png",
  "trust_level": 1,
  "assign_icon": "user-plus",
  "assign_path": "/u/运思/activity/assigned"
}

Python:

@supermathie

In [1]: import requests

In [2]: api_key = '«redacted»'

In [3]: r = requests.get('https://try.discourse.org/u/运思/notifications.json', headers = {
  'api-key': api_key,
  'api-username': '运思'.encode()
})

In [4]: r.status_code
Out[4]: 200

In [5]: r.json()['users'][0]
Out[5]: 
{'id': 41,
 'username': '运思',
 'name': 'Michael Brown',
 'avatar_template': '/user_avatar/try.discourse.org/运思/{size}/208_2.png',
 'trust_level': 1,
 'assign_icon': 'user-plus',
 'assign_path': '/u/运思/activity/assigned'}