title: POST request turns into GET request
body: <p>I have a Rails 4.1 application with nginx and unicorn. Some of POST request are turn into GET request. I gues it's related my nginx config. Here is the <a href="https://stackoverflow.com/questions/24028322/post-request-mysteriously-turn-into-get-request">previous question</a> about it.</p>
  
  <p>Here is the my nginx.conf file:</p>
  
  <pre><code># you generally only need one nginx worker unless you're serving
  # large amounts of static files which require blocking disk reads
  worker_processes 3;
  
  # # drop privileges, root is needed on most systems for binding to port 80
  # # (or anything &lt; 1024).  Capability-based security may be available for
  # # your system and worth checking out so you won't need to be root to
  # # start nginx to bind on 80
  user nobody nogroup; # for systems with a "nogroup"
  # user nobody nobody; # for systems with "nobody" as a group instead
  
  # Feel free to change all paths to suite your needs here, of course
  pid /run/nginx.pid;
  # error_log /path/to/nginx.error.log;
  
  events {
    worker_connections 1024; # increase if you have lots of clients
    accept_mutex off; # "on" if nginx worker_processes &gt; 1
    # use epoll; # enable for Linux 2.6+
    # use kqueue; # enable for FreeBSD, OSX
  }
  
  http {
    # nginx will find this file in the config directory set at nginx build time
    include mime.types;
  
    # fallback in case we can't determine a type
    default_type application/octet-stream;
  
    # click tracking!
    # TODO: Fixme
    # access_log /path/to/nginx.access.log combined;
  
    # you generally want to serve static files with nginx since neither
    # Unicorn nor Rainbows! is optimized for it at the moment
    sendfile on;
  
    tcp_nopush on; # off may be better for *some* Comet/long-poll stuff
    tcp_nodelay off; # on may be better for some Comet/long-poll stuff
    keepalive_timeout 65;
    types_hash_max_size 2048;
  
    access_log /var/log/nginx/access.log;
    error_log /var/log/nginx/error.log;
  
    # we haven't checked to see if Rack::Deflate on the app server is
    # faster or not than doing compression via nginx.  It's easier
    # to configure it all in one place here for static files and also
    # to disable gzip for clients who don't get gzip/deflate right.
    # There are other gzip settings that may be needed used to deal with
    # bad clients out there, see http://wiki.nginx.org/NginxHttpGzipModule
    gzip on;
    gzip_http_version 1.1;
    gzip_proxied any;
    gzip_min_length 500;
    gzip_disable "MSIE [1-6]\.";
    gzip_types text/plain text/html text/xml text/css
               text/comma-separated-values
               text/javascript application/x-javascript
               application/atom+xml;
  
    include /etc/nginx/conf.d/*.conf;
    include /etc/nginx/sites-enabled/*;
  }
  </code></pre>
  
  <p>Here is the my host file located in </p>
  
  <pre><code># this can be any application server, not just Unicorn/Rainbows!
  upstream my-app {
    # fail_timeout=0 means we always retry an upstream even if it failed
    # to return a good HTTP response (in case the Unicorn master nukes a
    # single worker for timing out).
  
    # for UNIX domain socket setups:
    server unix:/tmp/my-app.unicorn.sock fail_timeout=0;
  
    # for TCP setups, point these to your backend servers
    # server 192.168.0.7:8080 fail_timeout=0;
    # server 192.168.0.8:8080 fail_timeout=0;
    # server 192.168.0.9:8080 fail_timeout=0;
  }
  
  server {
    # enable one of the following if you're on Linux or FreeBSD
    # listen 80 default deferred; # for Linux
    # listen 80 default accept_filter=httpready; # for FreeBSD
  
    # If you have IPv6, you'll likely want to have two separate listeners.
    # One on IPv4 only (the default), and another on IPv6 only instead
    # of a single dual-stack listener.  A dual-stack listener will make
    # for ugly IPv4 addresses in $remote_addr (e.g ":ffff:10.0.0.1"
    # instead of just "10.0.0.1") and potentially trigger bugs in
    # some software.
    # listen [::]:80 ipv6only=on; # deferred or accept_filter recommended
    # listen 80;
  
    client_max_body_size 4G;
    server_name my-app.com;
    # Remove trailing slash
    rewrite ^/(.*)/$ /$1 permanent;
  
    # ~2 seconds is often enough for most folks to parse HTML/CSS and
    # retrieve needed images/icons/frames, connections are cheap in
    # nginx so increasing this is generally safe...
    keepalive_timeout 5;
  
    # path for static files
    root /opt/www/my-app/current/public;
  
    # Enable gzip
    location ~* \.(ico|css|pdf|js|jpg|gif|jpeg|png|swf)$ {
      gzip_static on;
      expires 24h;
      add_header Cache-Control public;
    }
  
    location ~ ^/assets/.*-(.*)\..* {
      gzip_static on; # to serve pre-gzipped version
      expires 1y;
      add_header ETag $1;
      add_header Cache-Control public;
    }
  
  
    # Prefer to serve static files directly from nginx to avoid unnecessary
    # data copies from the application server.
    #
    # try_files directive appeared in in nginx 0.7.27 and has stabilized
    # over time.  Older versions of nginx (e.g. 0.6.x) requires
    # "if (!-f $request_filename)" which was less efficient:
    # http://bogomips.org/unicorn.git/tree/examples/nginx.conf?id=v3.3.1#n127
    try_files $uri/index.html $uri @my-app;
  
    location @my-app {
      # an HTTP header important enough to have its own Wikipedia entry:
      #   http://en.wikipedia.org/wiki/X-Forwarded-For
      proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
  
      # enable this if you forward HTTPS traffic to unicorn,
      # this helps Rack set the proper URL scheme for doing redirects:
      # proxy_set_header X-Forwarded-Proto $scheme;
  
      # pass the Host: header from the client right along so redirects
      # can be set properly within the Rack application
      proxy_set_header Host $http_host;
  
      # we don't want nginx trying to do something clever with
      # redirects, we set the Host: header above already.
      proxy_redirect off;
  
      # set "proxy_buffering off" *only* for Rainbows! when doing
      # Comet/long-poll/streaming.  It's also safe to set if you're using
      # only serving fast clients with Unicorn + nginx, but not slow
      # clients.  You normally want nginx to buffer responses to slow
      # clients, even with Rails 3.1 streaming because otherwise a slow
      # client can become a bottleneck of Unicorn.
      #
      # The Rack application may also set "X-Accel-Buffering (yes|no)"
      # in the response headers do disable/enable buffering on a
      # per-response basis.
      # proxy_buffering off;
  
      proxy_pass http://my-app.com;
    }
  
    # Rails error pages
    error_page 500 502 503 504 /500.html;
    location = /500.html {
      root /opt/www/my-app/current/public;
    }
  }
  
  server {
    server_name www.my-app.com
    return 301 $scheme://my-app.com$request_uri;
  </code></pre>
  
  <p>}</p>
  
  <p>For security reason I hide some info. Any idea?</p>