HTTP/2 301 date: Wed, 31 Dec 2025 04:00:08 GMT content-type: text/html; charset=utf-8 content-length: 0 cross-origin-opener-policy: same-origin location: /ref/ nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1} referrer-policy: strict-origin-when-cross-origin report-to: {"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=LV6aGHRHPoqgQAigwfA0g8HwFULWJiUSv%2BMKXopb2tE%3D\u0026sid=67ff5de4-ad2b-4112-9289-cf96be89efed\u0026ts=1767153608"}],"max_age":3600} reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=LV6aGHRHPoqgQAigwfA0g8HwFULWJiUSv%2BMKXopb2tE%3D&sid=67ff5de4-ad2b-4112-9289-cf96be89efed&ts=1767153608" server: cloudflare set-cookie: cid=1094918d07d54dca97b1f46971f24d4e; expires=Thu, 31 Dec 2026 04:00:08 GMT; Max-Age=31536000; Path=/ strict-transport-security: max-age=31536000; includeSubDomains; preload vary: Cookie via: 2.0 heroku-router x-content-type-options: nosniff cf-cache-status: DYNAMIC cf-ray: 9b66de433a1ae8e0-BLR alt-svc: h3=":443"; ma=86400 HTTP/2 200 date: Wed, 31 Dec 2025 04:00:08 GMT content-type: text/html; charset=utf-8 cross-origin-opener-policy: same-origin nel: {"report_to":"heroku-nel","response_headers":["Via"],"max_age":3600,"success_fraction":0.01,"failure_fraction":0.1} referrer-policy: strict-origin-when-cross-origin report-to: {"group":"heroku-nel","endpoints":[{"url":"https://nel.heroku.com/reports?s=LV6aGHRHPoqgQAigwfA0g8HwFULWJiUSv%2BMKXopb2tE%3D\u0026sid=67ff5de4-ad2b-4112-9289-cf96be89efed\u0026ts=1767153608"}],"max_age":3600} reporting-endpoints: heroku-nel="https://nel.heroku.com/reports?s=LV6aGHRHPoqgQAigwfA0g8HwFULWJiUSv%2BMKXopb2tE%3D&sid=67ff5de4-ad2b-4112-9289-cf96be89efed&ts=1767153608" server: cloudflare set-cookie: origin=ref-realpython.com; expires=Mon, 25 Sep 2028 04:00:08 GMT; Max-Age=86313600; Path=/ strict-transport-security: max-age=31536000; includeSubDomains; preload vary: Cookie, Accept-Encoding via: 2.0 heroku-router x-content-type-options: nosniff x-frame-options: SAMEORIGIN cf-cache-status: DYNAMIC content-encoding: gzip cf-ray: 9b66de44bcbfe8e0-BLR alt-svc: h3=":443"; ma=86400