为什么 Nginx 总是返回 301？

Question

我有一个 nginx 设置，配置为与 Unicorn 上游（它是一个 Rails 应用程序）对话。我已经检查了基础知识。我知道请求正在发送到 nginx，它映射到 server_name，它找到 try_files 指令，它会转到最后一个指令，即 @unicorn 映射到位置块。在位置块中我有这个：

location @unicorn {
        # 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;

        # this helps Rack set the proper URL scheme for doing HTTPS 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;

        proxy_pass http://unicorn_myapp;
      }

然后进一步查看我的文件

upstream unicorn_myapp {
  # 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).
  server unix:/etc/sockets/unicorn.myapp.sock;
}

我也有独角兽在同一个套接字上监听。这是我的独角兽配置文件​​中的一个片段：

# Use at least one worker per core if you're on a dedicated server,
# more will usually help for _short_ waits on databases/caches.
worker_processes 2

# Help ensure your application will always spawn in the symlinked
# "current" directory that Capistrano sets up.
working_directory "/home/deployer/apps/myapp/current"

# listen on both a Unix domain socket
# we use a shorter backlog for quicker failover when busy
listen "/etc/sockets/unicorn.myapp.sock", :backlog => 64

我已经验证两个守护进程都在运行，套接字文件存在（例如独角兽正在监听）并且不存在权限问题，因为这会被记录。说到日志，每当我请求根目录时，nginx 都会返回以下内容：

HTTP/1.1 301 Moved Permanently
Server: nginx/1.4.6
Date: Sun, 30 Mar 2014 21:05:55 GMT
Content-Type: text/html
Transfer-Encoding: chunked
Connection: keep-alive
Status: 301 Moved Permanently
Location: https://myapp.com

这会记录在 nginx 的访问日志中：

xx.xx.xx.xx - - [30/Mar/2014:17:05:55 -0400] "GET / HTTP/1.1" 301 5 "-" "-"

Unicorn 的日志中没有任何内容。这里可能发生了什么？

Answer 1

我明白了。我的 Production.rb 文件中实际上有force_ssl = true