简短版本：

我想使用NGINX作为反向代理，以便访问面向公众的URL的客户端从代理后面的内部Gunicorn服务器获得API数据：

external path (proxy) => internal app
<static IP>/ABC/data  => 127.0.0.1:8001/data

我没有得到正确的位置Map。

长版本：

我第一次设置NGINX，并试图将其用作Gunicorn提供的rest API的反向代理。该api在127.0.0.1:8001上提供服务，我可以从服务器访问它并获得相应的响应，因此我相信该部分工作正常。它正在使用Supervisord持续运行。
我想从外部访问其中一个API端点<static IP>/ABC/data。在Gunicorn服务器上，此端点位于localhost:8001/data。最终，我想通过NGINX为根目录的其他Web应用程序提供服务，如<static IP>/foo，<static IP>/bar等。这些Web应用程序中的每一个都来自独立的Python应用程序。但目前，当我尝试从外部访问端点时，我得到了一个444错误代码，所以我认为我没有正确配置NGINX。
我第一次尝试在config posted on the Guincorn site上进行NGINX配置。我没有使用单个配置，而是将其拆分为全局配置和特定于站点的配置。我在etc/nginx/nginx.conf上的全局配置如下所示：

user ops;
worker_processes 1;
pid /run/nginx.pid;
error_log /tmp/nginx.error.log;

events {
  worker_connections 1024; # increase if you have lots of clients
  accept_mutex off; # set to 'on' if nginx worker_processes > 1
  use epoll;
  # 'use epoll;' to enable for Linux 2.6+
  # 'use kqueue;' to enable for FreeBSD, OSX
}

http {
  include mime.types;
  # fallback in case we can't determine a type
  default_type application/octet-stream;
  access_log /tmp/nginx.access.log combined;
  sendfile on;

  server_tokens off;

  server {
    # if no Host match, close the connection to prevent host spoofing
    listen 80 default_server;
    return 444;
  }

  gzip on;
  gzip_disable "msie6";

  include /etc/nginx/conf.d/*.conf;
  include /etc/nginx/sites-enabled/*;
}

然后，我的站点特定配置在/etc/nginx/sites-available中（并在/etc/nginx/sites-enabled中符号链接）是：

upstream app_server {
  # fail_timeout=0 means we always retry an upstream even if it failed
  # to return a good HTTP response

  # for UNIX domain socket setups
  # server unix:/tmp/gunicorn_abc_api.sock fail_timeout=0;

  # for a TCP configuration
  server 127.0.0.1:8001 fail_timeout=0;
}

server {
  # use 'listen 80 deferred;' for Linux
  # use 'listen 80 accept_filter=httpready;' for FreeBSD
  listen 80 deferred;
  client_max_body_size 4G;

  # set the correct host(s) for your site
  server_name _;

  keepalive_timeout 100;

  # path for static files
  #root /path/to/app/current/public;

  location /ABC {
    # checks for static file, if not found proxy to app
    try_files $uri @proxy_to_app;
  }

  location @proxy_to_app {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    # enable this if and only if you use HTTPS
    # proxy_set_header X-Forwarded-Proto https;
    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://app_server;
  }

  # error_page 500 502 503 504 /500.html;
  # location = /500.html {
  #   root /path/to/app/current/public;
  # }
}

配置通过了service nginx checkconfig，但我最终在访问日志中看到以下内容：

XXX.XXX.X.XXX - - [09/Sep/2016:01:03:18 +0000] "GET /ABC/data HTTP/1.1" 444 0 "-" "python-requests/2.10.0"

我想我在某种程度上没有正确配置路由。任何建议将不胜感激。

更新：

我做了一些修改，现在它可以正常工作了。我注解掉了下面的代码块：

server {
    # if no Host match, close the connection to prevent host spoofing
    listen 80 default_server;
    return 444;
  }

我不知道如何获得返回444的行为，除非有一个有效的路由。我想，但我仍然停留在这一部分。这个块似乎吃了所有传入的请求。我还改变了应用程序配置：

upstream app_server {
    server 127.0.0.1:8001 fail_timeout=0;
}

server {
    # use 'listen 80 deferred;' for Linux
    # use 'listen 80 accept_filter=httpready;' for FreeBSD
    listen 80 deferred;
    client_max_body_size 100M;

    # set the correct host(s) for your site
    server_name $hostname;

    keepalive_timeout 100;

    location /ABC {
    # checks for static file, if not found proxy to app
    try_files $uri @proxy_to_app;
    }

    location @proxy_to_app {
    proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
    # enable this if and only if you use HTTPS
    # proxy_set_header X-Forwarded-Proto https;
    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;
    rewrite ^/ABC/(.*) /$1 break;
    proxy_pass http://app_server;
    }

}

基本上，我似乎不得不显式地设置server_name，并使用rewrite来获得到应用服务器的正确Map。