We've been running nginx 1.1.18, 1.1.19, 1.2.0, with both HTTP/HTTPS enabled. Our static files are loaded from nginx root, but since 1.1.18 $request_time of static files some times gets 10+ seconds, recardless the actual file size. Various optimizing were tried with little gain, and the problem seems irrelavent to browsers as of access log. With 1.2.0 we just noticed that access log shows file truncating with HTTP status code 200. Looking forward to your help, thank you.

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Log format:
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log_format main '$remote_addr - $remote_user [$time_local] [$request_time] [$upstream_response_time] "$request" $request_length ' ' $status $upstream_addr $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"';

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access log:
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27.129.164.208 - - [16/May/2012:06:44:12 +0800] [15.511] [-] "GET /mgt/images/v3/common/f4.gif?v=6 HTTP/1.1" 950 200 - 57756 "http://x.x.x/mgt/frame.jsp?url=RA9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; 360SE)" "-"
27.129.164.208 - - [16/May/2012:06:45:33 +0800] [11.194] [-] "GET /mgt/images/v3/common/f4.gif?v=6 HTTP/1.1" 950 200 - 106455 "http://x.x.x/mgt/frame.jsp?url=RA9" "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1; .NET CLR 2.0.50727; 360SE)" "-"

$ ls -l /var/www/html/mgt/mgt/images/v3/common/f4.gif
-rw-r--r-- 1 root root 106455 2012-04-20 23:09 /var/www/html/mgt/mgt/images/v3/common/f4.gif

Actual file size is 106455 bytes, yet the first log shows 57756 bytes.

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System info:
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$ uname -a
Linux debian 2.6.26-1-amd64 #1 SMP Sat Jan 10 17:57:00 UTC 2009 x86_64 GNU/Linux

CPU: Intel(R) Xeon(TM) CPU 3.00GHz * 2, 8 cores.

$ nginx -V
nginx version: nginx/1.2.0
built by gcc 4.3.2 (Debian 4.3.2-1.1)
TLS SNI support enabled
configure arguments: --prefix=/usr/local/nginx --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx --user=www-data --group=www-data --with-http_ssl_module --with-cpu-opt=CPU --with-http_stub_status_module --with-pcre --add-module=../nginx-sticky-module-1.0

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nginx.conf:
-----------------------

user www-data www-data;
worker_processes 16;
error_log /var/log/nginx/error.log error;
pid logs/nginx.pid;
worker_rlimit_nofile 65535;

events {
use epoll;
worker_connections 4096;
epoll_events 1024;
accept_mutex off;
}
http {
include mime.types;
default_type application/octet-stream;
charset utf-8;

server_names_hash_bucket_size 128;
client_header_buffer_size 32k;
large_client_header_buffers 4 32k;

client_max_body_size 300m;
client_body_buffer_size 512k;

open_file_cache max=10000 inactive=300s;
open_file_cache_valid 300s;
open_file_cache_min_uses 1;
open_file_cache_errors on;

gzip on;
gzip_min_length 1k;
gzip_buffers 4 16k;
gzip_http_version 1.1;
gzip_comp_level 2;
gzip_types text/plain application/x-javascript text/css application/xml;
gzip_vary on;

log_format main '$remote_addr - $remote_user [$time_local] [$request_time] [$upstream_response_time] "$request" $request_length ' ' $status $upstream_addr $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"';

access_log /var/log/nginx/access.log main;

sendfile on;
tcp_nopush on;
tcp_nodelay on;

upstream mgt_tomcats {
sticky path=/;
server 192.168.0.40:8080 max_fails=2 fail_timeout=60s;
server 192.168.0.45:8080 max_fails=2 fail_timeout=60s;
keepalive 64;
}

server {
listen x.x.x.x:80;
include common.conf
}

server {
listen x.x.x.x:443;
ssl on;
ssl_certificate server.crt;
ssl_certificate_key server.key;

ssl_session_timeout 5m;
ssl_session_cache shared:SSL:10m;

ssl_protocols SSLv2 SSLv3 TLSv1;
ssl_ciphers HIGH:!aNULL:!MD5;
ssl_prefer_server_ciphers on;

include common.conf

# snip, snip, other configurations
}
}
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common.conf:
----------------------
keepalive_timeout 10;

server_name x.x.x;
root /var/www/html/mgt;

proxy_connect_timeout 60;
proxy_read_timeout 60;
proxy_send_timeout 10;
proxy_buffer_size 16k;
proxy_buffers 4 64k;
proxy_busy_buffers_size 128k;

proxy_http_version 1.1;
proxy_set_header Connection "";

proxy_redirect off;
proxy_set_header Host $host;
proxy_set_header X-Real-IP $remote_addr;
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_pass_header User-Agent;

location ~* ^/(mgt|Apps|mgt-system)/(image|styles|scripts)/ {
expires 30d;
if (!-e $request_filename) {
proxy_pass http://mgt_tomcats;
break;
}
}