an upstream response is buffered to a temporary file — Proxy Buffering Warning

이 에러의 원인

The response is larger than proxy_buffer_size and proxy_buffers combined. Nginx writes excess data to a temporary file.

수정 방법

Increase proxy_buffer_size and proxy_buffers. Set proxy_max_temp_file_size to limit disk usage. Disable buffering with proxy_buffering off if not needed.

# Increase buffer size
proxy_buffer_size 128k;
proxy_buffers 4 256k;
proxy_busy_buffers_size 256k;