Nginx error log

Nginx error.log recorded multiple lines of the following message for the last two days:

2021/03/03 04:48:39 [warn] 1173#1173: *37687 a client request body is buffered to a temporary file /var/lib/nginx/body/0000000832, client:, server: site1.local, request: “POST /api/method/frappe.www.printview.get_html_and_style HTTP/1.1”, host: “”, referrer: “

nginx version: nginx/1.14.0 (Ubuntu)
ERPNext: v12.18.0 (version-12)
Frappe Framework: v12.15.0 (version-12)

production setup (easy install script)

Should this be a concern?

Also curious about this warning. I’ve added client_body_buffer_size = 10m to my nginx.conf file but that hasn’t fixed it.

The requests in my nginx access log are usually under a 1Mb so I’m not sure why it needs this temp buffer.