Angular 信号器在IIS上不工作（CORS问题错误405）

我开发并安装了AspNetCore应用程序。 在我的开发环境中，一切都很好。 我可以与signalR建立集线器连接并使用它而不会出现任何问题。 但是，当我发布到IIS（10.0）时，出现以下错误：

访问位于的XMLHttpRequest'http://localhost:5000/chart/negotiate“起源”http://localhost:8034'已被CORS策略阻止：对飞行前请求的响应未通过访问控制检查：请求的资源上不存在'access control Allow Origin'标头。

在Startup.cs的服务器端，我的配置服务方法包含以下代码：

services.AddCors（选项=>
{
options.AddPolicy（“CorsPolicy”，
builder=>builder
.AllowAnyMethod（）
.AllowAnyHeader（）
.AllowCredentials（）
.AllowAnyOrigin（）
);
});

在配置方法中定义信号机路由

app.usesigner（路由=>
{
routes.MapHub（“/图表”）；
});

并添加了cors策略

app.UseCors（“CorsPolicy”）；

我试过：

• 切换到不同的端口

• 将集线器连接url更改为部署IIS服务器的端口（8034）

这将导致以下错误：

WebSocket connection to 'ws://localhost:8034/chart?id=vzjCtGG-Glo_8i-1j7oFDA' failed: Error during WebSocket handshake: Incorrect 'Sec-WebSocket-Accept' header value

• 启用Https

• 将AllowWallOrigin更改为WithOrigin（“，…）

• 将HttpProtocols添加到web.config

在当地，它是一种魅力： 概述

Request URL: http://localhost:5000/chart/negotiate
Request Method: POST
Status Code: 200 OK
Remote Address: 127.0.0.1:5000
Referrer Policy: no-referrer-when-downgrade

**响应头**

Content-Length: 252
Content-Type: application/json
Date: Thu, 31 Oct 2019 01:51:05 GMT
Server: Kestrel
X-Powered-By: ASP.NET
X-SourceFiles: =?UTF-8?B?QzpcQmFzZW1lbnRMYW5BcHBcQmFzZW1lbnRMYW5BcHBcY2hhcnRcbmVnb3RpYXRl?=

请求标题

Provisional headers are shown
Content-Type: text/plain;charset=UTF-8
Origin: http://localhost:5000
Referer: http://localhost:5000/
Sec-Fetch-Mode: cors
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36
X-Requested-With: XMLHttpRequest

在端口8034上发布到IIS时，它不起作用。 概述：

Request URL: http://localhost:5000/chart/negotiate
Request Method: OPTIONS
Status Code: 405 Method Not Allowed
Remote Address: 127.0.0.1:5000
Referrer Policy: no-referrer-when-downgrade

Content-Length: 0
Content-Type: text/plain
Date: Thu, 31 Oct 2019 01:28:35 GMT
Server: Kestrel
X-Powered-By: ASP.NET
X-SourceFiles: =?UTF-8?B?QzpcQmFzZW1lbnRMYW5BcHBcQmFzZW1lbnRMYW5BcHBcY2hhcnRcbmVnb3RpYXRl?=

Provisional headers are shown
Access-Control-Request-Headers: x-requested-with
Access-Control-Request-Method: POST
Origin: http://localhost:8034
Referer: http://localhost:8034/
Sec-Fetch-Mode: cors
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

响应标题：

Request URL: http://localhost:5000/chart/negotiate
Request Method: OPTIONS
Status Code: 405 Method Not Allowed
Remote Address: 127.0.0.1:5000
Referrer Policy: no-referrer-when-downgrade

Content-Length: 0
Content-Type: text/plain
Date: Thu, 31 Oct 2019 01:28:35 GMT
Server: Kestrel
X-Powered-By: ASP.NET
X-SourceFiles: =?UTF-8?B?QzpcQmFzZW1lbnRMYW5BcHBcQmFzZW1lbnRMYW5BcHBcY2hhcnRcbmVnb3RpYXRl?=

Provisional headers are shown
Access-Control-Request-Headers: x-requested-with
Access-Control-Request-Method: POST
Origin: http://localhost:8034
Referer: http://localhost:8034/
Sec-Fetch-Mode: cors
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

请求头：

Request URL: http://localhost:5000/chart/negotiate
Request Method: OPTIONS
Status Code: 405 Method Not Allowed
Remote Address: 127.0.0.1:5000
Referrer Policy: no-referrer-when-downgrade

Content-Length: 0
Content-Type: text/plain
Date: Thu, 31 Oct 2019 01:28:35 GMT
Server: Kestrel
X-Powered-By: ASP.NET
X-SourceFiles: =?UTF-8?B?QzpcQmFzZW1lbnRMYW5BcHBcQmFzZW1lbnRMYW5BcHBcY2hhcnRcbmVnb3RpYXRl?=

Provisional headers are shown
Access-Control-Request-Headers: x-requested-with
Access-Control-Request-Method: POST
Origin: http://localhost:8034
Referer: http://localhost:8034/
Sec-Fetch-Mode: cors
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

这是我的启动设置：

{
  "iisSettings": {
    "windowsAuthentication": false,
    "anonymousAuthentication": true,
    "iisExpress": {
      "applicationUrl": "http://localhost:5000/",
      "sslPort": 0
    }
  },
  "profiles": {
    "IIS Express": {
      "commandName": "IISExpress",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      }
    },
    "ChartApp": {
      "commandName": "Project",
      "launchBrowser": true,
      "environmentVariables": {
        "ASPNETCORE_ENVIRONMENT": "Development"
      },
      "applicationUrl": "http://localhost:5000/"
    }
  }
}

我不明白为什么在我发布的环境中会出现405异常。 我允许来自所有来源的请求，因此我希望响应头包含“访问控制允许凭据”=“true”

---

我缺少什么？

发送请求的服务器未正确配置为处理选项请求。该配置与CORS配置不同。尝试使用Postman或curl或其他非浏览器工具向该服务器发送选项请求，您将得到相同的405方法Not Allowed error。现在的答案可能有帮助，也可能没有帮助。