Sudden CORS error appears

Hi Render community,

I have deployed the following services:

  • API developed with NestJS
  • Sales website with Nuxt 3 for general web traffic
  • Admin website with Nuxt 3 for administration
  • iPad webapp with Nuxt 3 for receiving bookings from customers
  • iPad webapp with Nuxt 3 for handling bookings by staff

They have all been deployed for 1 month and has been working.

After yesterday’s maintenance by Render, the 2 iPad webapps receive CORS errors. They did not receive any updates for a month. The API has been updated on Friday, but everything worked Saturday and even Sunday until after the maintenance.

Access to XMLHttpRequest at 'https://xxxxx' from origin 'https://yyyyy' has been blocked by CORS policy: Response to preflight request doesn't pass access control check: It does not have HTTP ok status.

While writing this message, the CORS errors disappeared on 1 of the sites.

Can anybody help me what is going on?


I’ve replied to the ticket you also opened. Let’s keep the conversation in one place (on the ticket). Then, you can update this post when we get to the solution.


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