Nginx PHP FPM error : upstream response is buffered

2017/07/12 15:50:18 [warn] 24179#24179: *66 an upstream response is buffered to a temporary file /var/cache/nginx/fastcgi_temp/1/00/0000000001 while reading upstream, client: 114.125.38.153, server: cdn.jaranguda.com, request: “GET /8508-remote/ HTTP/1.1”, upstream: “fastcgi://unix:/run/php/php7.0-fpm.sock:”, host: “cdn.jaranguda.com”
2017/07/12 15:50:18 [info] 7095#7095: *1 client exceeded http2_max_field_size limit while processing HTTP/2 connection, client: 192.168.2.10, server: 0.0.0.0:443

fastcgi_buffer_size 128k;
fastcgi_buffers 8 128k;
fastcgi_busy_buffers_size 128k;
fastcgi_temp_file_write_size 128k;

http2_max_field_size 64k;
http2_max_header_size 64k;

systemctl restart nginx
# atau
service nginx restart