Random 503 from cloudflare

Website, Application, Performance
1

Hi,
I am getting random 503 errors for some of my projects. [from both my remote monitoring server and from my own browser]
However, it only lasts for 1 minute, maybe less. Then everything goes back to normal.

CF 503
CF 5031178×221 7.08 KB

I checked Cloudflare status and couldn’t see anything obvious.
Any thoughts?

Thanks.

2

request with curl and 503 response:

< HTTP/2 503
< date: Wed, 30 Nov 2022 21:20:50 GMT
< content-type: text/html
< report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=D%2FT7fYk78Ci3v%2F45xOmF0S0KYTsCBt6xKSw0JchMQ2%2FrWzzsSkU7x9L48klu%2BESmd0slbJkx6Mc%2FiLR0HrZ0zBW1aPk1FGhIZfnuNOcFtFyyea%2B1M%2BGeVwd25Ke0pbdNXKoOyg%3D%3D"}],"group":"cf-nel","max_age":604800}
< nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
< server: cloudflare
< cf-ray: 7726a11b294992d8-IST
< alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400```
3

and one more with body included

< HTTP/2 503
< date: Wed, 30 Nov 2022 21:23:33 GMT
< content-type: text/html
< report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=PTYxo0Ve8PjudalEMmQtNp8PtfhMahLCDvyKwoYcJxad0%2BV6gIyKpuNPbnEx%2F3lEINPPFohsa%2Ft7raH7OwWPeStGnDQfsw4djJ6yMMdNqVZ%2FRHmXlZjc8KzhKHnEFjQ2JNJrDQ%3D%3D"}],"group":"cf-nel","max_age":604800}
< nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
< server: cloudflare
< cf-ray: 7726a5197a1f92d7-IST
< alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400
<
<html>
<head><title>503 Service Temporarily Unavailable</title></head>
<body>
<center><h1>503 Service Temporarily Unavailable</h1></center>
<hr><center>cloudflare</center>
</body>
</html>```