Nginx FastCGI 在 stderr 中发送：“主要脚本未知”

Question

我正在使用 nixos 和 nginx，我对它们都很陌生。现在我正尝试让 nginx 工作并处理一个 php 文件。每当我尝试打开http://[我的示例].local/在浏览器中，它显示“文件未找到”。nginx-log 指出

Aug 30 19:25:17 nixos nginx[29576]: 2019/08/30 19:25:17 [error] 29579#29579: *4 FastCGI sent in stderr: "Primary script unknown" while reading response header from upstream, client: 127.0.0.1, server: example.local, request: "GET / HTTP/1.1", upstream: "fastcgi://unix:/var/run/phpfpm/example.sock:", host: "example.local"

配置部分的 nginx 部分内容如下

# Enable nginx web server
  services.nginx = {
    enable = true;
    virtualHosts."example.local" = {
      root = "/home/username/PhpstormProjects/wordpress_installations/example/";
      locations = {
        "~ \.php$".extraConfig = ''
        include ${pkgs.nginx}/conf/fastcgi_params;
        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
        fastcgi_pass unix:/var/run/phpfpm/example.sock;
        fastcgi_index index.php;
      '';
       "/".extraConfig = "try_files $uri /index.php?$args ;";
      };
    };
  };

相关的 php 部分是

  # phpfpm
  services.phpfpm.pools.example = {
    listen = "/var/run/phpfpm/example.sock";
    extraConfig = ''
    pm = ondemand
    listen.owner = nginx
    pm.max_children=50;
    user = username
  '';
  };  

自动生成的 nginx 配置文件是

user nginx nginx;
error_log stderr;
daemon off;
events {
}
http {
        include /nix/store/rfs7420034mjxhnwvlyg5cmhddn3q394-nginx-1.14.2/conf/mime.types;
        include /nix/store/rfs7420034mjxhnwvlyg5cmhddn3q394-nginx-1.14.2/conf/fastcgi.conf;
        include /nix/store/rfs7420034mjxhnwvlyg5cmhddn3q394-nginx-1.14.2/conf/uwsgi_params;
        ssl_protocols TLSv1.2 TLSv1.3;
        ssl_ciphers EECDH+aRSA+AESGCM:EDH+aRSA:EECDH+aRSA:+AES256:+AES128:+SHA1:!CAMELLIA:!SEED:!3DES:!DES:!RC4:!eNULL;
        # $connection_upgrade is used for websocket proxying
        map $http_upgrade $connection_upgrade {
                default upgrade;
                ''      close;
        }
        client_max_body_size 10m;
        server_tokens off;
        server {
                listen 0.0.0.0:80 ;
                listen [::]:80 ;
                server_name example.local ;
                root /home/username/PhpstormProjects/wordpress_installations/example/;
                location / {
                        try_files $uri /index.php?$args ;
                }
                location ~ .php$ {
                        include /nix/store/rfs7420034mjxhnwvlyg5cmhddn3q394-nginx-1.14.2/conf/fastcgi_params;
                        fastcgi_param  SCRIPT_FILENAME  $document_root$fastcgi_script_name;
                        fastcgi_pass unix:/var/run/phpfpm/example.sock;
                        fastcgi_index index.php;
                }
        }
}