Asp 带有 503 服务不可用的 Net Core 3 示例

Question

在 visual studio 和运行应用程序中使用 react 和 .Net Core 3.0 或 3.1 创建新的 ASP.NET 核心 Web 应用程序时页面显示：

503 Service Unavailable

Failed to connect to server localhost

我正在使用 windows 10 professional 和 visual studio 2019。
错误发生在 IISExpress 和 kestrel 中运行ning。
在不同的机器上这工作正常。
使用 "Web Application (Model-View-Controller)" 创建模板有效。
api 调用有效 (https://localhost:5001/WeatherForecast)。

我正在对项目中从 AspNet Core 2.2 到 3.0 的迁移进行故障排除，但出现相同的错误，我检查了模板项目是否可以正常工作，发现该错误并非特定于迁移。找出模板不起作用的原因可能会解决迁移错误。

编辑：

禁用防火墙没有解决问题。

这是尝试打开页面的调试日志：

dbug: Microsoft.AspNetCore.Server.Kestrel[39]
      Connection id "0HLTKHV201G3Q" accepted.
dbug: Microsoft.AspNetCore.Server.Kestrel[1]
      Connection id "0HLTKHV201G3Q" started.
dbug: Microsoft.AspNetCore.Server.Kestrel[39]
      Connection id "0HLTKHV201G3R" accepted.
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 GET http://localhost:5000/
dbug: Microsoft.AspNetCore.Server.Kestrel[1]
      Connection id "0HLTKHV201G3R" started.
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[4]
      The request path / does not match a supported file type
dbug: Microsoft.AspNetCore.Routing.Matching.DfaMatcher[1000]
      No candidates found for the request path '/'
dbug: Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware[2]
      Request did not match any endpoints
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 27.156ms 503 text/html; charset=UTF-8
dbug: Microsoft.AspNetCore.Server.Kestrel[10]
      Connection id "0HLTKHV201G3Q" disconnecting.
dbug: Microsoft.AspNetCore.Server.Kestrel[2]
      Connection id "0HLTKHV201G3Q" stopped.
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[6]
      Connection id "0HLTKHV201G3Q" received FIN.
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[7]
      Connection id "0HLTKHV201G3Q" sending FIN because: "The Socket transport's send loop completed gracefully."
info: Microsoft.AspNetCore.Hosting.Diagnostics[1]
      Request starting HTTP/1.1 GET http://localhost:5000/favicon.ico
trce: Microsoft.AspNetCore.HostFiltering.HostFilteringMiddleware[2]
      All hosts are allowed.
dbug: Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware[5]
      The request path /favicon.ico does not match an existing file
dbug: Microsoft.AspNetCore.Routing.Matching.DfaMatcher[1000]
      No candidates found for the request path '/favicon.ico'
dbug: Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware[2]
      Request did not match any endpoints
info: Microsoft.AspNetCore.Hosting.Diagnostics[2]
      Request finished in 19.8075ms 503 text/html; charset=UTF-8
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[6]
      Connection id "0HLTKHV201G3R" received FIN.
dbug: Microsoft.AspNetCore.Server.Kestrel[10]
      Connection id "0HLTKHV201G3R" disconnecting.
dbug: Microsoft.AspNetCore.Server.Kestrel.Transport.Sockets[7]
      Connection id "0HLTKHV201G3R" sending FIN because: "The client closed the connection."
dbug: Microsoft.AspNetCore.Server.Kestrel[2]
      Connection id "0HLTKHV201G3R" stopped.

Answer 1

发生这种情况是因为代理阻止了来自 .Net 主机的响应请求，并且 angular。

在 AspNetCore 3.0 中，HttpClient 现在有一个从系统变量 HTTPS_PROXY、HTTP_PROXY 和 NO_PROXY.

创建的默认代理

将 NO_PROXY=localhost 添加到系统变量解决了我的问题。

Asp 带有 503 服务不可用的 Net Core 3 示例

Asp Net Core 3 Sample with 503 Service Unavailable

.net-core

asp.net-core

asp.net-core-3.0

asp.net-core-3.1