# In safari:
# Failed to load resource: the server responded with a status of 413 (Request Entity Too Large)

# Test in python:
import requests

url = 'https://my.site.ru/api/file/'
with open('test_2m', 'rb') as f:
    data = {'origin': f}
    r = requests.post(url, files=data)
    # requests.exceptions.ConnectionError: ('Connection aborted.', BrokenPipeError(32, 'Broken pipe'))

# Test in httpie:
http -f post http://my.site.ru/api/file/ origin@test_2m
# http: error: ConnectionError: ('Connection aborted.', BrokenPipeError(32, 'Broken pipe'))

# Test against http://httpbin.org/post
from pprint import pprint
import requests

url = 'http://httpbin.org/post'
with open('test_2m', 'rb') as f:
    data = {'origin': f}
    r = requests.post(url, files=data)
    pprint(r.json()['headers'])

{'Accept': '*/*',
 'Accept-Encoding': 'gzip, deflate',
 'Connection': 'close',
 'Content-Length': '1100145',
 'Content-Type': 'multipart/form-data; '
                 'boundary=216f8fc98dee4a6cbe4e295f2048bbbd',
 'Host': 'httpbin.org',
 'User-Agent': 'python-requests/2.14.2'}