curl -X POST \
  'https://pu.vk.com/<ссылка загрузки>' \
  -H 'content-type: multipart/form-data;' \
  -F photo=@/private/tmp/f.png

import http.client

conn = http.client.HTTPConnection("pu,vk,com")

payload = "------WebKitFormBoundary7MA4YWxkTrZu0gW\r\nContent-Disposition: form-data; name=\"photo\"; filename=\"f.png\"\r\nContent-Type: image/png\r\n\r\n\r\n------WebKitFormBoundary7MA4YWxkTrZu0gW--"

headers = {
    'content-type': "multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW",
    'Cache-Control': "no-cache",
    'Postman-Token': "78ca70c7-7da5-45c7-8a79-67d79d09761c"
    }

conn.request("POST", "", payload, headers)

res = conn.getresponse()
data = res.read()

print(data.decode("utf-8"))

Сейчас доступны: manage,messages,photos,docs.

Требуются права доступа: wall.

https://oauth.vk.com/authorize?client_id=<app_id>&redirect_uri=https://oauth.vk.com/blank.html&display=page&scope=wall&response_type=token&v=5.130

https://api.vk.com/method/wall.post?owner_id=-<group_id>&form_group=1&scope=wall&message=123&v=5.130&access_token=<access_token (ключ доступа пользователя)>

curl -i -H 'Authorization: Basic dXNlcjpwYXNzd29yZA==' http://localhost:8080/