nginx rewrites $request_method on error

[kay]

user  nginx;
worker_processes  1;

error_log  /var/log/nginx/error.log warn;
pid        /var/run/nginx.pid;

events {
    worker_connections  1024;
}

http {
    include       /etc/nginx/mime.types;
    default_type  application/octet-stream;

# LET'S LOG $request_method #
    log_format  main  '$request_method $remote_addr - $remote_user
[$time_local] "$request" '
                      '$status $body_bytes_sent "$http_referer" '
                      '"$http_user_agent" "$http_x_forwarded_for"';

#HERE IS WHAT MAKES A BUG#
    error_page 405 /error.html;

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

    sendfile        on;
    #tcp_nopush     on;

    keepalive_timeout  65;

    #gzip  on;

server {
    listen       80;

    if ($request_method != GET) {
        return 405;
    }

    location / {
        root /etc/nginx/www;
    }
}

}

What we get:
1) 
curl -X POST localhost
log:
GET 127.0.0.1 - - [30/Apr/2014:10:55:03 +0400] "POST / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"

2)
curl -X TRACE localhost
log:
GET 127.0.0.1 - - [30/Apr/2014:10:55:10 +0400] "TRACE / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"

3)
curl -X PUT localhost
log:
GET 127.0.0.1 - - [30/Apr/2014:10:55:18 +0400] "PUT / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"

Let's disable "if":
1) curl -X POST localhost
GET 127.0.0.1 - - [30/Apr/2014:10:58:48 +0400] "POST / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"
2) curl -X TRACE localhost
GET 127.0.0.1 - - [30/Apr/2014:10:59:12 +0400] "TRACE / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"
3) curl -X PUT localhost
GET 127.0.0.1 - - [30/Apr/2014:10:59:38 +0400] "PUT / HTTP/1.1" 405 0 "-"
"curl/7.26.0" "-"

Let's disable "error_page 405 /error.html;"
1) curl -X POST localhost
POST 127.0.0.1 - - [30/Apr/2014:11:00:43 +0400] "POST / HTTP/1.1" 405 172
"-" "curl/7.26.0" "-"
2) curl -X TRACE localhost
TRACE 127.0.0.1 - - [30/Apr/2014:11:01:02 +0400] "TRACE / HTTP/1.1" 405 172
"-" "curl/7.26.0" "-"
3) curl -X PUT localhost
PUT 127.0.0.1 - - [30/Apr/2014:11:01:16 +0400] "PUT / HTTP/1.1" 405 172 "-"
"curl/7.26.0" "-"

So it seems that error_page 405 /error.html rewrites $request_method

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,249754,249754#msg-249754