# Previously passing code stopped working **URL:** \ **Category:** Challenges\ **Tags:** challenge:redis\ **Created:** [October 29, 2025, 2:35am UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462 "2025-10-29T02:35:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![scrlt12209](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/scrlt12209/32/19137_2.png) [@scrlt12209](https://forum.codecrafters.io/u/scrlt12209)\ **Post date:** [October 29, 2025, 2:35am UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/1 "2025-10-29T02:35:15Z")
[my code](https://github.com/scrlt12209/codecrafters-redis-python.git) here’s a link to my code, i thought it was due to my internet but I’m back home and it still doesn’t work so i have no idea what’s happening ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [October 29, 2025, 4:51am UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/3 "2025-10-29T04:51:37Z")
Hey @scrlt12209, thanks for sharing the link! Just to help us dig in, could you let us know which stage you’re currently stuck on? If possible, a screenshot of what you’re seeing would be super helpful too. ---
**Author:** ![scrlt12209](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/scrlt12209/32/19137_2.png) [@scrlt12209](https://forum.codecrafters.io/u/scrlt12209)\ **Post date:** [October 29, 2025, 12:48pm UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/4 "2025-10-29T12:48:00Z")
![image_2025-10-29_084634047](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/6/4/64c7ac46150083a24ff684b04560319855d684ae.png) here’s the screenshot and i’m stuck on stage ZU2 because my code which previously passed stage WY1 stopped passing and i have no idea why its giving me the env erors up at the top because the only thing i messed besides for the code was setting debug to true ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [October 29, 2025, 6:59pm UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/6 "2025-10-29T18:59:07Z")
@scrlt12209 The link is returning a 404, possibly the repo is private or the link is broken. ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/5/4/54a5aae0c734bfd8030fbbdb4b126bf086f04a2e.jpeg) > here’s the screenshot and i’m stuck on stage ZU2 because my code which previously passed stage WY1 stopped passing Thanks for sharing the screenshot! ![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/3/9/39230161fd269837f0e8dffd11f2c4b3cdad41c5.jpeg) Looks like your code (which passed stage WY1) is still working correctly. However, stage ZU2 introduces multiple concurrent clients, so your code needs to be able to handle requests from different clients at the same time. ---
**Author:** ![scrlt12209](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/scrlt12209/32/19137_2.png) [@scrlt12209](https://forum.codecrafters.io/u/scrlt12209)\ **Post date:** [October 29, 2025, 8:12pm UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/8 "2025-10-29T20:12:15Z")
the repo is public now so the link will work now ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [October 29, 2025, 8:24pm UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/11 "2025-10-29T20:24:53Z")
![image](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/8/6/86ed752ecf202d3e07ed1236423b78c3e6cf800e.png) The current implementation is insufficient to handle concurrent connections. You’ll need to introduce concurrency, using either threads (`threading`) or asynchronous I/O (`asyncio`). ---
**Author:** ![andy1li](https://yyz1.discourse-cdn.com/flex003/user_avatar/forum.codecrafters.io/andy1li/32/10_2.png) [@andy1li](https://forum.codecrafters.io/u/andy1li)\ **Post date:** [November 8, 2025, 3:38am UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/12 "2025-11-08T03:38:54Z")
Closing this thread due to inactivity. If you still need assistance, feel free to reopen or start a new discussion! ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex003/uploads/codecrafters/original/3X/7/0/700657133935c15703e22c7c8870394f6e6dc27d.svg) [@system](https://forum.codecrafters.io/u/system)\ **Post date:** [November 13, 2025, 3:39am UTC](https://forum.codecrafters.io/t/previously-passing-code-stopped-working/15462/13 "2025-11-13T03:39:25Z")
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