Cors handling update

[Anton Zh]

😱 What is happening? What did you expect instead?

Cors not working for frontend.
Proposed chat solution:

from corsheaders.defaults import default_headers

CORS_ORIGIN_ALLOW_ALL = env.bool("CORS_ORIGIN_ALLOW_ALL", default=False)

CORS_ORIGIN_WHITELIST = CSRF_TRUSTED_ORIGINS = env.list("CORS_ORIGIN_WHITELIST")

CORS_ALLOW_CREDENTIALS = True

CORS_ALLOW_HEADERS = default_headers + (
    "If-None-Match",
    "Last-Modified",
    "Accept-Language",
    "If-Modified-Since",
    "Access-Control-Allow-Origin",
)

CORS_EXPOSE_HEADERS = (
    "ETag",
    "Last-Modified",
    "HTTP_X_RESPONSE_ID",
    "HTTP_GIT_BRANCH",
    "Access-Control-Expose-Headers",
)

☝️ Steps to reproduce

🐛 More details (Sentry link, etc.)

🚨 Priority

• Major problem (System not working at all)
• Very high (Urgent fix needed)
• [] High, but handled later
• Medium
• Low

[Anton Zh]

Should work after #22