HTTP 204 responses with payload produce 520 errors

Website, Application, Performance DNS & Network
1

204 (No Content) responses from origin web server turn into 520 errors when being proxied through Cloudflare. This only happens when the response contains a payload (one character is enough).

Current behavior:
The Cloudflare proxy responds with HTTP code 520 with a message in its body: “Web server is returning an unknown error”.

Expected behavior:
The Cloudflare proxy may forward or ignore the payload and respond normally with 204.

Example to reproduce: https://www.haus-und-grund-muenchen.de/cf-test-204-with-payload.php
This PHP script contains:

<?php http_response_code(204); echo '.'; However, the same script hosted at another domain and web server is responding fine. Both domains have very similar configuration and Caching enabled. Working example: https://pumsrvld.pumox.com/gp/with-payload.php This problem may be related to this recent incident: https://www.cloudflarestatus.com/incidents/hljt52nzcsnf
2

Sounds like your server could be overload, or incorrectly configured! What’s the domain name?

3

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