How to upload an image to the VK server for further publication on the wall?

Question

JavaScript

Following the instructions from the VK API, I got the address of the server, which will receive the image in the future.

Next, you need to form a POST request with the upload_url and photo fields in the multipack/form-data format . And at that moment, everything stopped. Whatever I try, the server sends an empty array instead of the photo field. Help me please!

Answer 1

There is a program for making HTTP requests. It's called Postman. In it, you can visually form a request and generate code.
Here is an example curl request:

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

Or in Python:

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"))