在 DigitalOcean 上由 Dokku 托管的 asp .net 核心出现 400 错误请求错误答案

【问题标题】：400 Bad Request error with asp .net core hosted with Dokku on DigitalOcean在 DigitalOcean 上由 Dokku 托管的 asp .net 核心出现 400 错误请求错误
【发布时间】：2019-04-11 19:39:11
【问题描述】：

我的 asp .net core web api 有问题。我用 jwt 设置了授权。一切都在本地主机上完美运行。当我上传到 Dokku 时，我无法将 POST 发送到服务器，我得到 400。

这是我从 sigil 文件生成的 nginx 配置：

{{ range $port_map := .PROXY_PORT_MAP | split " " }}
{{ $port_map_list := $port_map | split ":" }}
{{ $scheme := index $port_map_list 0 }}
{{ $listen_port := index $port_map_list 1 }}
{{ $upstream_port := index $port_map_list 2 }}

{{ if eq $scheme "http" }}
server {
  listen      [::]:{{ $listen_port }};
  listen      {{ $listen_port }};
  {{ if $.NOSSL_SERVER_NAME }}server_name {{ $.NOSSL_SERVER_NAME }}; {{ end }}
  access_log  /var/log/nginx/{{ $.APP }}-access.log;
  error_log   /var/log/nginx/{{ $.APP }}-error.log;
{{ if (and (eq $listen_port "80") ($.SSL_INUSE)) }}
  return 301 https://$host:{{ $.PROXY_SSL_PORT }}$request_uri;
{{ else }}
  location    / {

    ###CORS-START###
    if ($request_method = 'OPTIONS') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       #
       # Custom headers and headers various browsers *should* be OK with but aren't
       #
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
       #
       # Tell client that this pre-flight info is valid for 20 days
       #
       add_header 'Access-Control-Max-Age' 1728000;
       add_header 'Content-Type' 'text/plain; charset=utf-8';
       add_header 'Content-Length' 0;
       return 204;
    }
    if ($request_method = 'POST') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
       add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
    }
    if ($request_method = 'GET') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
       add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
    }
    ###CORS-END###

    gzip on;
    gzip_min_length  1100;
    gzip_buffers  4 32k;
    gzip_types    text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml  application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml;
    gzip_vary on;
    gzip_comp_level  6;

    proxy_pass  http://{{ $.APP }}-{{ $upstream_port }};
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Port $server_port;
    proxy_set_header X-Request-Start $msec;

    proxy_set_header 'Access-Control-Max-Age' 1728000;
    proxy_set_header 'Access-Control-Allow-Origin' '*';
    proxy_set_header 'Access-Control-Allow-Credentials' 'true';
    proxy_set_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    proxy_set_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
  }
  include {{ $.DOKKU_ROOT }}/{{ $.APP }}/nginx.conf.d/*.conf;

  error_page 400 401 402 403 405 406 407 408 409 410 411 412 413 414 415 416 417 418 420 422 423 424 426 428 429 431 444 449 450 451 /400-error.html;
  location /400-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 404 /404-error.html;
  location /404-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 500 501 502 503 504 505 506 507 508 509 510 511 /500-error.html;
  location /500-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }
{{ end }}
}
{{ else if eq $scheme "https"}}
server {
  listen      [::]:{{ $listen_port }} ssl {{ if eq $.HTTP2_SUPPORTED "true" }}http2{{ else if eq $.SPDY_SUPPORTED "true" }}spdy{{ end }};
  listen      {{ $listen_port }} ssl {{ if eq $.HTTP2_SUPPORTED "true" }}http2{{ else if eq $.SPDY_SUPPORTED "true" }}spdy{{ end }};
  {{ if $.SSL_SERVER_NAME }}server_name {{ $.SSL_SERVER_NAME }}; {{ end }}
  {{ if $.NOSSL_SERVER_NAME }}server_name {{ $.NOSSL_SERVER_NAME }}; {{ end }}
  access_log  /var/log/nginx/{{ $.APP }}-access.log;
  error_log   /var/log/nginx/{{ $.APP }}-error.log;

  ssl_certificate     {{ $.APP_SSL_PATH }}/server.crt;
  ssl_certificate_key {{ $.APP_SSL_PATH }}/server.key;
  ssl_protocols       TLSv1.2;
  ssl_prefer_server_ciphers on;

  keepalive_timeout   70;
  {{ if and (eq $.SPDY_SUPPORTED "true") (ne $.HTTP2_SUPPORTED "true") }}add_header          Alternate-Protocol  {{ $.PROXY_SSL_PORT }}:npn-spdy/2;{{ end }}

  location    / {

    ###CORS-START###
    if ($request_method = 'OPTIONS') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       #
       # Custom headers and headers various browsers *should* be OK with but aren't
       #
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range';
       #
       # Tell client that this pre-flight info is valid for 20 days
       #
       add_header 'Access-Control-Max-Age' 1728000;
       add_header 'Content-Type' 'text/plain; charset=utf-8';
       add_header 'Content-Length' 0;
       return 204;
    }
    if ($request_method = 'POST') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,Authorization';
       add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
    }
    if ($request_method = 'GET') {
       add_header 'Access-Control-Allow-Origin' '*';
       add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
       add_header 'Access-Control-Allow-Headers' 'DNT,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Range,,Authorization';
       add_header 'Access-Control-Expose-Headers' 'Content-Length,Content-Range';
    }
    ###CORS-END###
    gzip on;
    gzip_min_length  1100;
    gzip_buffers  4 32k;
    gzip_types    text/css text/javascript text/xml text/plain text/x-component application/javascript application/x-javascript application/json application/xml  application/rss+xml font/truetype application/x-font-ttf font/opentype application/vnd.ms-fontobject image/svg+xml;
    gzip_vary on;
    gzip_comp_level  6;

    proxy_pass  http://{{ $.APP }}-{{ $upstream_port }};
    {{ if eq $.HTTP2_PUSH_SUPPORTED "true" }}http2_push_preload on; {{ end }}
    proxy_http_version 1.1;
    proxy_set_header Upgrade $http_upgrade;
    proxy_set_header Connection "upgrade";
    proxy_set_header Host $http_host;
    proxy_set_header X-Forwarded-Proto $scheme;
    proxy_set_header X-Forwarded-For $remote_addr;
    proxy_set_header X-Forwarded-Port $server_port;
    proxy_set_header X-Request-Start $msec;
    proxy_set_header 'Access-Control-Max-Age' 1728000;
    proxy_set_header 'Access-Control-Allow-Origin' '*';
    proxy_set_header 'Access-Control-Allow-Credentials' 'true';
    proxy_set_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';
    proxy_set_header 'Access-Control-Allow-Headers' 'DNT,X-CustomHeader,Keep-Alive,User-Agent,X-Requested-With,If-Modified-Since,Cache-Control,Content-Type,Authorization';
  }
  include {{ $.DOKKU_ROOT }}/{{ $.APP }}/nginx.conf.d/*.conf;

  error_page 400 401 402 403 405 406 407 408 409 410 411 412 413 414 415 416 417 418 420 422 423 424 426 428 429 431 444 449 450 451 /400-error.html;
  location /400-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 404 /404-error.html;
  location /404-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }

  error_page 500 501 502 503 504 505 506 507 508 509 510 511 /500-error.html;
  location /500-error.html {
    root {{ $.DOKKU_LIB_ROOT }}/data/nginx-vhosts/dokku-errors;
    internal;
  }
}
{{ end }}{{ end }}

{{ if $.DOKKU_APP_LISTENERS }}
{{ range $upstream_port := $.PROXY_UPSTREAM_PORTS | split " " }}
upstream {{ $.APP }}-{{ $upstream_port }} {
{{ range $listeners := $.DOKKU_APP_LISTENERS | split " " }}
{{ $listener_list := $listeners | split ":" }}
{{ $listener_ip := index $listener_list 0 }}
  server {{ $listener_ip }}:{{ $upstream_port }};{{ end }}
}
{{ end }}{{ end }}

在 asp 应用中 cors 已启用，一切都被允许。

@编辑

有问题。当我在 IIS Express 上本地运行我的应用程序（asp .net 核心）时，使用 post 方法一切正常。一旦它被上传到数字海洋到 dokku 我得到 400。我用邮递员将相同的数据发送到我当地的 IIS Express 和 Dokku。我认为这与 nginx 或 dokku 有关。我正在使用码头集装箱。我认为这是CORS问题。

【问题讨论】：

您遇到了 400 错误请求问题。您的浏览器报告有关它的 CORS 相关消息的唯一原因是您的服务器未在 400 错误响应中包含 Access-Control-Allow-Origin 标头。默认情况下，服务器通常只会将您的自定义应用程序集标头添加到 2xx。但即使 400 错误包含 Access-Control-Allow-Origin 标头，您仍然需要修复 400 问题。所以在这种情况下，你的服务器代码中的 CORS-config sn-p 不是很相关。相反，更相关的是前端 JavaScript 代码的 sn-p。
有问题。当我在 IIS Express 上本地运行我的应用程序（asp .net 核心）时，使用 post 方法一切正常。一旦它被上传到数字海洋到 dokku 我得到 400。我用邮递员将相同的数据发送到我当地的 IIS Express 和 Dokku。我认为这与 nginx 或 dokku 有关。我正在使用码头集装箱。我认为这是 CORS 问题。
浏览器在 devtools 控制台中记录的确切错误消息是什么？接收服务器在响应 400 之前在服务器端的服务器日志中记录了哪些消息？

标签： asp.net-core nginx-config dokku

【解决方案1】：

解决方案很简单。使用 Docker 时，您也使用 nginx。我从我的 asp .net 核心应用程序中只暴露了一个端口。这是http之一。 Nginx 正在尝试升级到 https，但由于 docker 没有 ssl 端口而无法升级。仅暴露 http 端口时从 nginx 配置中删除升级

【讨论】：

你能解释一下你是怎么做到的吗？ "仅暴露 http 端口时从 nginx 配置中删除升级"
Dokku 允许您为每个应用添加自定义 nginx 配置。将 nginx 文件添加到 docker 映像中的 app 文件夹，dokku 将使用您的模板。有 dokku 文档的链接：dokku.viewdocs.io/dokku/configuration/nginx/…