我正在尝试使用Mono / Nginx / Fastcgi将C#asp.net项目移植到Ubuntu,并且在一些API请求中,我看到Nginx在我期待200时返回404 http响应 . 该应用程序正常工作Windows服务器上的IIS,所以我真的很感激一些帮助调试这种不一致的行为 .

我正在使用:每晚单声道4.5,nginx 1.9,fastcgi-mono-server4和Net4.5项目 .

我的代码使用 xbuild 'mysolution'.sln 编译得很好,然后运行

fastcgi-mono-server4 /applications=/:/var/www/html/{folder containing my /bin} /socket=tcp:127.0.0.1:9000 /printlog=True /verbose=True & 打开我的mono fastcgi服务器,然后打开我的nginx服务器 service nginx restart

但在运行时,前端请求命中我的任何API,包括以下API

[HttpGet]
[Authorize]
[Route("UserRoles")]
public IHttpActionResult GetUserRoles(string userId)
{
    var userRoles = _repo.GetUserRoles(userId);
    return Ok(userRoles);
}

它有时会返回404错误,而不是200次成功 .

通过Charles跟踪我的http请求/响应显示nginx正在发送404未找到的响应,所以我认为问题出在API上 .

但是,添加带有添加的日志记录的自定义MessageHandler会显示API正在接收请求,处理它,然后返回200个成功的响应 . 看起来它位于MessageHandler和nginx服务器之间,响应消息从200找不到404 .

由于在Charles中重放相同的API请求会返回200响应,因此在多个请求期间Mono中的某处似乎存在一些资源约束问题 .

我尝试在nginx和fastcgi中打开调试以获得更有用的日志记录:在nginx.conf中使用 error_log /var/log/nginx/error.log debug; 并在运行Fastcgi时使用 loglevels=All

但没有看到任何有用的东西 .

nginx configs / etc / nginx / sites-enabled / default

server {
    listen 80 default_server;
    listen [::]:80 default_server;

    root /var/www/html/RM.WebAPI;
    error_log /var/log/nginx/error.log debug;
    rewrite_log on;

    location / {
            try_files $uri $uri/ @proxy;
    }

    location @proxy {
            if ($request_method = 'OPTIONS') {
                    add_header 'Access-Control-Allow-Origin' $http_origin always;
                    add_header 'Access-Control-Allow-Credentials' 'true'; 
                    add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
                    add_header 'Access-Control-Allow-Headers' 'DNT,X-Mx-ReqToken,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';

                    return 204;
            }

            include /etc/nginx/fastcgi_params;
            fastcgi_next_upstream http_404; #invalid_header http_500;
            fastcgi_keep_conn off;
            autoindex on;

            fastcgi_pass 127.0.0.1:9000;
    }
}

我的自定义MessageHandler MonoMessageHandler.cs

public class MonoMessageHandler : DelegatingHandler
{
    protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
    {
        var response = base.SendAsync(request, cancellationToken);

        Console.WriteLine("Returning response {0}:{3} for request {1}\n Content:{2}", response.Result.ToString(), request.RequestUri.ToString(), response.Result.Content.ToString(), response.Result.IsSuccessStatusCode);
        return response;
    }
}

更新:我添加自定义异常处理程序后,我开始在MessageHandler中收到以下错误

System.Runtime.ExceptionServices.ExceptionDispatchInfo
 Response:System.Web.Http.Results.ExceptionResult
 Exception:System.NullReferenceException: Object reference not set to an instance of an object
  at RM.WebAPI.MonoPatchingDelegatingHandler.SendAsync     (System.Net.Http.HttpRequestMessage request, CancellationToken cancellationToken) <0x40f18640 + 0x0019d> in <filename unknown>:0 
  at System.Net.Http.DelegatingHandler.SendAsync (System.Net.Http.HttpRequestMessage request, CancellationToken cancellationToken) <0x40f18600 + 0x0002b> in <filename unknown>:0 
  at System.Web.Http.HttpServer.<>n__FabricatedMethod9 (System.Net.Http.HttpRequestMessage , CancellationToken ) <0x40f185d0 + 0x0001b> in <filename unknown>:0 
  at System.Web.Http.HttpServer+<SendAsync>d__0.MoveNext () <0x40efbbb0 + 0x0042f> in <filename unknown>:0