./configure 
--with-http_v2_module --with-http_ssl_module 
--prefix=/usr/local/nginx --with-http_image_filter_module 
--with-http_gzip_static_module --with-http_secure_link_module 
--with-http_stub_status_module 
--add-module="/usr/local/ruby23/lib/ruby/gems/2.3.0/gems/passenger-5.0.24/src/nginx_module" 
--with-openssl=/usr/src/openssl-1.0.2f  
--add-module=/usr/src/ngx_mruby --add-module=/usr/src/ngx_mruby/dependence/ngx_devel_kit

$ wget https://www.openssl.org/source/openssl-1.0.2g.tar.gz
$ wget http://nginx.org/download/nginx-1.9.14.tar.gz
$ tar zxvf openssl-1.0.2g.tar.gz
$ tar zxvf nginx-1.9.14.tar.gz
$ git clone https://github.com/matsumoto-r/ngx_mruby.git
$ cd ngx_mruby
$ ./configure --with-ngx-src-root=../nginx-1.9.14
$ make build_mruby
$ make generate_gems_config
$ cd ../nginx-1.9.14
$ ./configure                     \
 --with-openssl=../openssl-1.0.2g \
 --with-http_ssl_module           \
 --add-module=../ngx_mruby
$ make
$ sudo make install
$ sudo /usr/local/nginx/sbin/nginx -g 'daemon off;'
$ echo $? # SEGV
139

# nginx

server {
  listen 127.0.0.1:8888;

  location / {
    mruby_rewrite_handler_code '
      headers = %w(abc=123 foo=bar)
      Nginx::Request.new.headers_out["Set-Cookies"] = headers
      Nginx.errlogger Nginx::LOG_ERR, headers
      Nginx::return headers.empty? ? Nginx::HTTP_INTERNAL_SERVER_ERROR : Nginx::OK
    ';
  }
}

$ curl http://127.0.0.1:8888 -sv > /dev/null
* Rebuilt URL to: http://127.0.0.1:8888/
* Hostname was NOT found in DNS cache
*   Trying 127.0.0.1...
* Connected to 127.0.0.1 (127.0.0.1) port 8888 (#0)
> GET / HTTP/1.1
> User-Agent: curl/7.35.0
> Host: 127.0.0.1:8888
> Accept: */*
>
< HTTP/1.1 500 Internal Server Error
* Server nginx is not blacklisted
< Server: nginx
< Date: Thu, 04 Feb 2016 11:40:12 GMT
< Content-Type: text/html
< Content-Length: 186
< Connection: close
< Set-Cookies: foo=bar
< Set-Cookies: abc=123
<
{ [data not shown]
* Closing connection 0
root@node1:~#

$ tail -1 /var/log/nginx/error.log
2016/02/04 11:40:12 [error] 11130#11130: *9 [], client: 127.0.0.1, server: , request: "GET / HTTP/1.1", host: "127.0.0.1:8888"

[emerg] 8190#0: *1 malloc(18446744073709551615) failed (12: Cannot allocate memory) while sending to client, client: 127.0.0.1, server: localhost, request: "HEAD /info.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm.sock", host: "localhost"
[error] 8190#0: *1 failed to read body ngx_http_mruby_body_filter_inline_handler:1763 while sending to client, client: 127.0.0.1, server: localhost, request: "HEAD /info.php HTTP/1.1", upstream: "fastcgi://unix:/var/run/php-fpm.sock", host: "localhost"

load_module modules/ngx_http_mruby_module.so;
worker_processes  2;
events {
    worker_connections  1024;
}


http {
    include       mime.types;
    default_type  application/octet-stream;
    sendfile        on;
    tcp_nopush     on;
    keepalive_timeout  5;

    upstream phpfpm {
        server unix:/var/run/php-fpm.sock;
    }

    server {
        listen       8080;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
        }
    }

    server {
        listen       80;
        server_name  localhost;

        location / {
            root   html;
            index  index.html index.htm;
            proxy_pass   http://127.0.0.1:8080;
            mruby_output_filter_code '
               r = Nginx::Request.new
               r.headers_out["X-MRUBY"] = "YES"
            ';
        }

        location ~ \.php {
            root   html;
            index  index.html index.htm;
            fastcgi_split_path_info ^(.+\.php)(/.+)$;
            fastcgi_pass   phpfpm;
            fastcgi_index  index.php;
            fastcgi_param  SCRIPT_FILENAME  /usr/share/nginx/html$fastcgi_script_name;
            mruby_output_filter_code '
            r = Nginx::Request.new
            r.headers_out["X-MRUBY"] = "YES"
        ';
        }

    }
}

$ curl -I localhost/
HTTP/1.1 200 OK
Server: nginx/1.11.1
Date: Tue, 07 Jun 2016 05:04:05 GMT
Content-Type: text/html
Content-Length: 612
Connection: keep-alive
Last-Modified: Mon, 06 Jun 2016 09:51:09 GMT
ETag: "5755478d-264"
Accept-Ranges: bytes
X-MRUBY: YES

$ curl -I localhost/info.php
curl: (52) Empty reply from server ## エラーログに Cannot allocate memory

$ ONLY_BUILD_NGX_MRUBY=true sh test.sh
2015/08/05 14:29:11 [info] 42733#0: *27 ngx_mruby INFO ngx_mrb_run:806:
mrb_run info: rputs_chain is null and return NGX_OK, client: 127.0.0.1,
server: localhost, request: "GET /nginx_var?name=server_protocol HTTP/1.
0", host: "127.0.0.1"
2015/08/05 14:29:11 [alert] 42733#0: *27 zero size buf in writer t:1 r:0
 f:0 00007FDAB6800020 00007FDAB6800098-00007FDAB6800098 0000000000000000
 140577341440000-0, client: 127.0.0.1, server: localhost, request: "GET
/nginx_var?name=server_protocol HTTP/1.0", host: "127.0.0.1"

(snip)

Fail: ngx_mruby - Nginx::Var [location /nginx_var?name=name]
 - Assertion[2] Failed: Expected to be equal
    Expected: "HTTP/1.0"
      Actual: nil
Total: 35
   OK: 34
   KO: 1
Crash: 0
 Time: 0.023947 seconds

$ ONLY_BUILD_NGX_MRUBY=true sh test.sh
2015/08/05 15:15:00 [info] 57959#0: *18 ngx_mruby INFO ngx_mrb_run:806:
mrb_run info: rputs_chain is null and return NGX_OK, client: 127.0.0.1,
server: localhost, request: "GET /headers_out_delete HTTP/1.0", host: "1
27.0.0.1"
2015/08/05 15:15:00 [error] 57959#0: *18 ngx_mruby ERROR ngx_mrb_send_he
ader: status code is 200, but response body is empty.Return NGX_HTTP_INT
ERNAL_SERVER_ERROR, client: 127.0.0.1, server: localhost, request: "GET
/headers_out_delete HTTP/1.0", host: "127.0.0.1"

(snip)

Fail: ngx_mruby [location /headers_out_delete]
 - Assertion[50] Failed: 46
    Expected: "foo"
      Actual: nil
Fail: ngx_mruby - Nginx::Var [location /nginx_var?name=name]
 - Assertion[2] Failed: Expected to be equal
    Expected: "HTTP/1.0"
      Actual: nil
Total: 35
   OK: 33
   KO: 2
Crash: 0
 Time: 0.019233 seconds

  location /foo {
    mruby_set_code $foo 'end';
  }

% ./build/nginx/sbin/nginx
INLINE CODE:1:3: syntax error, unexpected keyword_end
Segmentation fault

% gdb ./build/nginx/sbin/nginx 
GNU gdb (GDB) Red Hat Enterprise Linux 7.6.1-80.el7
Copyright (C) 2013 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /home/vagrant/ngx_mruby/build/nginx/sbin/nginx...done.
(gdb) run
Starting program: /home/vagrant/ngx_mruby/./build/nginx/sbin/nginx 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
INLINE CODE:1:3: syntax error, unexpected keyword_end

Program received signal SIGSEGV, Segmentation fault.
mrb_irep_incref (mrb=mrb@entry=0xb33830, irep=irep@entry=0x0) at /home/vagrant/ngx_mruby/mruby/src/state.c:125
125       irep->refcnt++;
Missing separate debuginfos, use: debuginfo-install glibc-2.17-106.el7_2.6.x86_64 nss-softokn-freebl-3.16.2.3-13.el7_1.x86_64 pcre-8.32-15.el7_2.1.x86_64 zlib-1.2.7-15.el7.x86_64
(gdb) bt
#0  mrb_irep_incref (mrb=mrb@entry=0xb33830, irep=irep@entry=0x0) at /home/vagrant/ngx_mruby/mruby/src/state.c:125
#1  0x0000000000505dd4 in mrb_proc_new (mrb=mrb@entry=0xb33830, irep=0x0) at /home/vagrant/ngx_mruby/mruby/src/proc.c:32
#2  0x0000000000518797 in mrb_generate_code (mrb=0xb33830, p=p@entry=0xbbc670)
    at /home/vagrant/ngx_mruby/mruby/mrbgems/mruby-compiler/core/codegen.c:2888
#3  0x00000000004ce927 in ngx_http_mruby_shared_state_compile (cf=cf@entry=0x7fffffffe020, state=0xb24628, code=0xbccb60)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:923
#4  0x00000000004d0546 in ngx_http_mruby_set_inner (cf=0x7fffffffe020, cmd=<optimized out>, conf=<optimized out>, 
    type=type@entry=NGX_MRB_CODE_TYPE_STRING) at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:1688
#5  0x00000000004d0697 in ngx_http_mruby_set_inline (cf=<optimized out>, cmd=<optimized out>, conf=<optimized out>)
    at /home/vagrant/ngx_mruby/src/http/ngx_http_mruby_module.c:1719
#6  0x0000000000465b64 in ngx_conf_handler (last=0, cf=0x7fffffffe020) at src/core/ngx_conf_file.c:427
#7  ngx_conf_parse (cf=cf@entry=0x7fffffffe020, filename=filename@entry=0x0) at src/core/ngx_conf_file.c:283
#8  0x00000000004829af in ngx_http_core_location (cf=0x7fffffffe020, cmd=<optimized out>, dummy=<optimized out>)
    at src/http/ngx_http_core_module.c:3256
#9  0x0000000000465b64 in ngx_conf_handler (last=1, cf=0x7fffffffe020) at src/core/ngx_conf_file.c:427
#10 ngx_conf_parse (cf=cf@entry=0x7fffffffe020, filename=filename@entry=0x0) at src/core/ngx_conf_file.c:283
#11 0x0000000000482c1b in ngx_http_core_server (cf=0x7fffffffe020, cmd=<optimized out>, dummy=<optimized out>)
    at src/http/ngx_http_core_module.c:3028
#12 0x0000000000465b64 in ngx_conf_handler (last=1, cf=0x7fffffffe020) at src/core/ngx_conf_file.c:427
#13 ngx_conf_parse (cf=cf@entry=0x7fffffffe020, filename=filename@entry=0x0) at src/core/ngx_conf_file.c:283
#14 0x000000000047e2f9 in ngx_http_block (cf=0x7fffffffe020, cmd=<optimized out>, conf=<optimized out>)
    at src/http/ngx_http.c:237
#15 0x0000000000465b64 in ngx_conf_handler (last=1, cf=0x7fffffffe020) at src/core/ngx_conf_file.c:427
#16 ngx_conf_parse (cf=cf@entry=0x7fffffffe020, filename=filename@entry=0xb1b568) at src/core/ngx_conf_file.c:283
#17 0x00000000004635da in ngx_init_cycle (old_cycle=old_cycle@entry=0x7fffffffe0c0) at src/core/ngx_cycle.c:274
#18 0x0000000000455932 in main (argc=<optimized out>, argv=<optimized out>) at src/core/nginx.c:276
``

location /mruby {
    mruby_content_handler_code 'Nginx.rputs("bokko\n");Nginx.rputs("cubicdaiya");Nginx.return 200;'
}

==24676== Syscall param writev(vector[...]) points to unaddressable byte(s)
==24676==    at 0x662460B: writev (writev.c:51)
==24676==    by 0x422CB0: ngx_linux_sendfile_chain (ngx_linux_sendfile_chain.c:294)
==24676==    by 0x432BF3: ngx_http_write_filter (ngx_http_write_filter_module.c:238)
==24676==    by 0x442530: ngx_http_chunked_body_filter (ngx_http_chunked_filter_module.c:110)
==24676==    by 0x447398: ngx_http_gzip_body_filter (ngx_http_gzip_filter_module.c:325)
==24676==    by 0x448132: ngx_http_postpone_filter (ngx_http_postpone_filter_module.c:83)
==24676==    by 0x449E0D: ngx_http_ssi_body_filter (ngx_http_ssi_filter_module.c:396)
==24676==    by 0x44CB29: ngx_http_charset_body_filter (ngx_http_charset_filter_module.c:553)
==24676==    by 0x4658DA: ngx_http_small_light_body_filter (ngx_http_small_light_module.c:221)
==24676==    by 0x409780: ngx_output_chain (ngx_output_chain.c:206)
==24676==    by 0x432FD0: ngx_http_copy_filter (ngx_http_copy_filter_module.c:143)
==24676==    by 0x442888: ngx_http_range_body_filter (ngx_http_range_filter_module.c:587)
==24676==  Address 0x9a507d0 is 0 bytes inside a block of size 55 free'd
==24676==    at 0x4C2A82E: free (in /usr/lib/valgrind/vgpreload_memcheck-amd64-linux.so)
==24676==    by 0x46FD44: allocf (state.c:38)
==24676==    by 0x49B892: obj_free (gc.c:190)
==24676==    by 0x49B951: incremental_sweep_phase (gc.c:748)
==24676==    by 0x49C312: mrb_incremental_gc (gc.c:804)
==24676==    by 0x49C48C: mrb_obj_alloc (gc.c:334)
==24676==    by 0x4732DA: mrb_str_literal (string.c:112)
==24676==    by 0x46CC69: mrb_run (vm.c:1719)
==24676==    by 0x46948F: ngx_mrb_run (ngx_http_mruby_core.c:68)
==24676==    by 0x468779: ngx_http_mruby_content_handler (ngx_http_mruby_module.c:307)
==24676==    by 0x42A5D0: ngx_http_core_content_phase (ngx_http_core_module.c:1412)
==24676==    by 0x4259C2: ngx_http_core_run_phases (ngx_http_core_module.c:885)

    -o objs/addon/ngx_mruby/ngx_http_mruby_module.o \
    /Users/senthil/mruby/ngx_mruby/ngx_http_mruby_module.c

class World
  def db
    @db ||= Userdata.new("my_#{Process.pid}").db
  end

  def find(id)
    ret = nil
    db.execute("select * from World where id = ?", id) do |row, fields|
      ret = Hash[fields.zip(row)]
    end
    ret
  end

  def save(world)
    db.execute("update World set randomNumber = ? where id = ?", world["randomNumber"], world["randomNumber"])
  end
end

r = Nginx::Request.new

num_queries = r.var.arg_queries.to_i
num_queries = 1 if num_queries < 0
num_queries = 500 if num_queries > 500

world = World.new
ret = num_queries.times.map { world.find(rand(10000)) }
Nginx.rputs JSON::stringify(ret)

$ sh mymruby_with_mrbgems.sh
$ cd ../nginx-1.3.8
$ ./configure --with-pcre --add-module=../ngx_mruby
$ make
                   ・
                   ・
                   ・
../ngx_mruby/mruby/lib/libmruby.a(init.o): In function `mrb_init_core':
/home/bokko/workspace/nginx/ngx_mruby/mruby/src/init.c:70: undefined reference to `mrb_init_mrbgems'

[root@instance-1 conf]# curl -l http://localhost:19999
curl: (52) Empty reply from server
[root@instance-1 conf]# curl -l http://localhost:19998
PORT 7779 CONTENTS
 WORLD

location /api {
  error_page 401 @error;
  mruby_access_handler /opt/nginx/lib/mruby/auth.rb;
  proxy_pass http://localhost:4567/hello;
}
location @error {
  mruby_content_handler /opt/nginx/lib/mruby/error.rb;
}

class ErrorResponse
  def call(env)
    return [401, [], ["Unauthorized"]]
  end
end
run ErrorResponse.new

diff --git a/mrbgems/rack-based-api/mrblib/rack.rb b/mrbgems/rack-based-api/mrblib/rack.rb
index 3ec7c01..57498b4 100644
--- a/mrbgems/rack-based-api/mrblib/rack.rb
+++ b/mrbgems/rack-based-api/mrblib/rack.rb
@@ -75,6 +75,8 @@ module Kernel
     end

     def self.build_response r, res
+      return if res.nil?
+
       if res[1].kind_of?(Hash)
         res[1].keys.each { |k| r.headers_out[k] = res[1][k] }
       elsif res[1].kind_of?(Array)
@@ -87,7 +89,7 @@ module Kernel
       else
         raise TypeError, "response body arg type must be Array"
       end
-      Server.return res[0].to_i
+      Server.return res[0].to_i if res[0]
     end
   end

        location /mruby {
            mruby_content_handler /usr/local/nginx/html/hello.mrb;
        }

Nginx.rputs("hello mruby world for nginx.")
Nginx.return Nginx::NGX_OK

nobody     917  0.0  0.0   5200  1136 ?        S    12:52   0:00  \_ nginx: worker process
nobody     918  0.0  0.0   5200  1160 ?        S    12:52   0:00  \_ nginx: worker process
nobody     919  0.0  0.0   5200  1160 ?        S    12:52   0:00  \_ nginx: worker process
nobody     920  0.0  0.0   5200  1140 ?        S    12:52   0:00  \_ nginx: worker process

nobody     901  6.9  6.5 547168 543596 ?       S    12:50   0:05  \_ nginx: worker process
nobody     902  2.7  2.6 219620 216124 ?       S    12:50   0:02  \_ nginx: worker process
nobody     903  2.0  1.9 162136 158572 ?       S    12:50   0:01  \_ nginx: worker process
nobody     904  1.5  1.4 124964 121464 ?       S    12:50   0:01  \_ nginx: worker process

nobody    4021  0.0  0.0   5200  1136 ?        S    13:01   0:00  \_ nginx: worker process
nobody    4022  0.0  0.0   5200  1136 ?        S    13:01   0:00  \_ nginx: worker process
nobody    4023  0.0  0.0   5200  1136 ?        S    13:01   0:00  \_ nginx: worker process
nobody    4024  0.0  0.0   5200  1112 ?        S    13:01   0:00  \_ nginx: worker process

nobody    3993  0.5  0.0   5484  1904 ?        S    12:59   0:00  \_ nginx: worker process
nobody    3994  0.0  0.0   5200  1160 ?        S    12:59   0:00  \_ nginx: worker process
nobody    3995  0.2  0.0   5304  1716 ?        S    12:59   0:00  \_ nginx: worker process
nobody    3996  0.0  0.0   5200  1140 ?        S    12:59   0:00  \_ nginx: worker process

./configure \
--prefix=/usr/local/nginx-1.4.1 \
--with-openssl=/usr/local/src/openssl-1.0.1e \
--with-http_ssl_module \
--with-http_spdy_module \
--with-http_realip_module \
--with-http_gunzip_module \
--with-http_gzip_static_module \
--add-module=../ngx_pagespeed-alpha-r2748 \
--add-module=/home/matsumoto_r/DEV/ngx_mruby \
--add-module=/home/matsumoto_r/DEV/ngx_mruby/dependence/ngx_devel_kit \

$ sudo gdb objs/nginx
GNU gdb (GDB) Red Hat Enterprise Linux (7.2-60.el6)
Copyright (C) 2010 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-redhat-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/local/src/nginx-1.4.1/objs/nginx...done.
(gdb) r
Starting program: /usr/local/src/nginx-1.4.1/objs/nginx 
[Thread debugging using libthread_db enabled]

Program received signal SIGSEGV, Segmentation fault.
0x0000003c93727a96 in __strcmp_sse42 () from /lib64/libc.so.6
Missing separate debuginfos, use: debuginfo-install glibc-2.12-1.107.el6.x86_64 hiredis-0.10.1-3.el6.x86_64 libgcc-4.4.7-3.el6.x86_64 libstdc++-4.4.7-3.el6.x86_64 nss-softokn-freebl-3.12.9-11.el6.x86_64 openssl-1.0.0-27.el6_4.2.x86_64 pcre-7.8-6.el6.x86_64 zlib-1.2.3-29.el6.x86_64
(gdb) where
#0  0x0000003c93727a96 in __strcmp_sse42 () from /lib64/libc.so.6
#1  0x0000003c98eb71da in ?? () from /usr/lib64/libcrypto.so.10
#2  0x0000003c98eb7526 in lh_insert () from /usr/lib64/libcrypto.so.10
#3  0x0000003c98e608fb in OBJ_NAME_add () from /usr/lib64/libcrypto.so.10
#4  0x0000000000b2d745 in SSL_library_init ()
#5  0x000000000043417e in ngx_ssl_init (log=0x10061a0) at src/event/ngx_event_openssl.c:94
#6  0x0000000000414e71 in main (argc=1, argv=0x7fffffffe738) at src/core/nginx.c:287

$ curl http://127.0.0.1/mruby
curl: (52) Empty reply from server

mrb_run failed. error: INLINE CODE:3: uninitialized constant Mginx (NameError)

worker_processes  4;
events {
    use kqueue;
    worker_connections  1024;
}
http {
    include       mime.types;
    default_type  application/octet-stream;
    mruby_init_code '
      userdata = Userdata.new "redis_data_key"
      userdata.redis = Redis.new "127.0.0.1", 6379
       ';
    keepalive_timeout  65;


    server {
        listen       8080;
        server_name  localhost;


        location / {
            root   html;
            index  index.html index.htm;
        }

        location /mruby {
          mruby_content_handler_code '
            if server_name == "NGINX"
              Server = Nginx
            elsif server_name == "Apache"
              Server = Apache
            end
            userdata = Userdata.new "redis_data_key"
            redis = userdata.redis
            result = JSON::stringify({ "custom_no"=>redis.spop("custom_no")})
            #result = JSON::stringify({"custom_no"=>"20160315"})
            Server::rputs result
          ';
        }
        location /mruby2 {
          mruby_content_handler_code '
            if server_name == "NGINX"
              Server = Nginx
            elsif server_name == "Apache"
              Server = Apache
            end
            userdata = Userdata.new "redis_data_key"
            redis = userdata.redis
            #result = JSON::stringify({ "custom_no"=>redis.spop("custom_no")})
            result = JSON::stringify({"custom_no"=>"20160315"})
            Server::rputs result
          ';
        }

    }
}

# Work fine Requests per second:    19073.66 [#/sec] (mean)
ab -k -c100 -n15000 http://127.0.0.1:8080/ 

# Work fine Requests per second:    22617.13 [#/sec] (mean)
ab -k -c100 -n15000 http://127.0.0.1:8080/mruby2 

# get blocked and timeout 
# apr_pollset_poll: The timeout specified has expired (70007)
# Total of 14920 requests completed
ab -k -c100 -n15000 http://127.0.0.1:8080/mruby 

====== SPOP ======
  100000 requests completed in 1.57 seconds
  50 parallel clients
  3 bytes payload
  keep alive: 1

98.25% <= 1 milliseconds
99.85% <= 2 milliseconds
100.00% <= 2 milliseconds
63653.72 requests per second

ulimit -n
65536

http {

    server {
        listen       8888;
        server_name  localhost;

        location / {
            set $upstream "";
            rewrite_by_lua '
               local res = ngx.location.capture("/redis")
               if res.status == ngx.HTTP_OK then
                  ngx.var.upstream  = res.body
               else
                  ngx.exit(ngx.HTTP_FORBIDDEN)
               end
            ';
            proxy_pass http://$upstream;
        }

        # HostヘッダをキーにしてRedisに問い合わせ
        location /redis {
             internal;
             set            $redis_key $host;
             redis_pass     127.0.0.1:6379;
             default_type   text/html;
        }
   }
}

[root@instance-1 nginx]# ps alx | head -1 && ps alx | grep nginx|grep work
F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
5    99 13388 13387  20   0  62892 27568 ep_pol S    ?          0:00 nginx: worker process
[root@instance-1 nginx]# ps alx | head -1 && ps alx | grep nginx|grep work
F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
5    99 13388 13387  20   0  68012 32768 ep_pol S    ?          0:05 nginx: worker process
[root@instance-1 nginx]# ps alx | head -1 && ps alx | grep nginx|grep work
F   UID   PID  PPID PRI  NI    VSZ   RSS WCHAN  STAT TTY        TIME COMMAND
5    99 13388 13387  20   0  73144 37948 ep_pol S    ?          0:11 nginx: worker process