Getting 520 error when content-length is above 262144 bytes plus non-OK response

Website, Application, Performance DNS & Network
1

Here is what I did:

  1. Made a request where everything is correct. Got 200 OK response.
  2. Token got expired after few mins, made the request again. Got 401 error.
  3. For the same request, if I hit again, I’m getting 520 error for the subsequent calls.

The weird things is that when the content-length is below 262144 bytes I’m getting the exact response that I’m getting from my actual server.
But, when it’s more than that, I keep getting 520 error if I get non-OK response for the first time.

I don’t have any clue why this is happening.

Data for debug:
CF-RAY: 822667793d4f4106-SIN
URL: https://dev-api.zoopwallet.app/account/v1/user/share/
cdn-cgi/trace:

fl=633f148
h=dev-api.zoopwallet.app
ip=27.107.8.130
ts=1699368954.409
visit_scheme=https
uag=PostmanRuntime/7.34.0
colo=SIN
sliver=none
http=http/1.1
loc=IN
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off
rbi=off
kex=X25519

HAR file: No HAR file as I’m making the request from the Postman.

4

Forgot to mention, I origin server is returning fine when proxy is disabled on the Cloudflare DNS page.

The issue is coming even when the development mode is on and Cloudflare is paused.

5

Also http is working fine but when requesting using https then getting the issue.

6

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