Set-Cookie header sets cookie in response but not session

When requesting a resource that responds with a Set-Cookie header, the response.cookies returns a RequestsCookierJar with the cookies set in the header, however, the session.cookies returns an empty RequestsCookieJar.

Expected Result

When requesting a resource that responds with the following headers: {'Content-Type': 'text/plain', 'set-cookie': 'foo=bar;'}, the response.cookies should include the foo=bar cookie and the session.cookies should include the foor=bar cookie.

E.g. both should be <RequestsCookieJar[<Cookie foo=bar for />]>

Actual Result

When requesting a resource that responds with the following headers: {'Content-Type': 'text/plain', 'set-cookie': 'foo=bar;'}, the response.cookies does include the foo=bar cookie but the session.cookies remains empty.

response.cookies yields <RequestsCookieJar[<Cookie foo=bar for />]> session.cookies yields <RequestsCookieJar[]>

Reproduction Steps

import requests

session = requests.Session()
response = session.get('http://www.blah.com/')
print(response.cookies)
print(session.cookies)

System Information

$ python -m requests.help

{
  "chardet": {
    "version": "3.0.4"
  },
  "cryptography": {
    "version": ""
  },
  "idna": {
    "version": "2.7"
  },
  "implementation": {
    "name": "CPython",
    "version": "3.6.5"
  },
  "platform": {
    "release": "17.3.0",
    "system": "Darwin"
  },
  "pyOpenSSL": {
    "openssl_version": "",
    "version": null
  },
  "requests": {
    "version": "2.19.1"
  },
  "system_ssl": {
    "version": "100020ff"
  },
  "urllib3": {
    "version": "1.23"
  },
  "using_pyopenssl": false
}

[nateprewitt]

@Audace it’s the same process but performed in two separate places. Here for Session and here for Response.

It would appear something on your mocked response isn’t populating what we’re expecting in r.raw. As I said above, since this doesn’t appear to be a defect in Requests but rather an issue in the mocking setup, we should probably move this to StackOverflow. That will avoid constantly pinging 1300 people watching the issue tracker for bugs in Requests. Feel free to ping the link here, or use the python-requests tag if you create a SO question. Thanks!

[Audace]

@nateprewitt got it. No this isn’t performing network IO - it’s a mocked response. I added a Content-Length to no avail. That being said, why would there be a difference between response.cookies and session.cookies? Is there a fundamental difference in the cookie extractor for these two jars?