【问题标题】：Yarp Reverse Proxy - Response 502 Bad GatewayYarp 反向代理 - 响应 502 错误网关
【发布时间】：2021-11-01 06:20:20
【问题描述】：

我想使用 Yarp 实现反向代理。 Api 已启动并正在运行，因为我可以向它发送请求。但是，每当我通过代理尝试相同的请求时，我都会收到错误 502 Bad gateway

Startup.cs

public void ConfigureServices(IServiceCollection services)
{
    services.AddReverseProxy()
     .LoadFromConfig(Configuration.GetSection("ReverseProxy"));
}

public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
{
    if (env.IsDevelopment())
    {
        app.UseDeveloperExceptionPage();
    }
    app.UseRouting();
    // Register the reverse proxy routes
    app.UseEndpoints(endpoints =>
    {
        endpoints.MapReverseProxy();
    });
}

应用设置

"ReverseProxy": {
    "Routes": {
      "route1": {
        "ClusterId": "cluster1",
        "Match": {
          //"Methods": [ "GET", "POST", "PUT", "HEAD", "OPTIONS", "DELETE" ],
          "Path": "{**catch-all}"
        }
      }
    },
    "Clusters": {
      "cluster1": {
        "Destinations": {
          "cluster1/destination1": {
            "Address": "https://localhost:44339/"
          }
        }
      }
    }
  }

每当我通过代理发送请求时，我都会收到响应 502 bad gateway

【问题讨论】：

标签： c# asp.net-core asp.net-core-3.1 yarp

【解决方案1】：

您应该点击output并选择ProjectName-Asp.Net Core Web Server查看详细信息。

我使用您的代码并附加了另一个设置，并检查了日志，我发现原因是 http://localhost:44339 没有启动。它应该在本地使用另一个 webapp 的端口。

{
  "Logging": {
    "LogLevel": {
      "Default": "Information",
      "Microsoft": "Warning",
      "Microsoft.Hosting.Lifetime": "Information"
    }
  },
  //"AllowedHosts": "*"

  "ReverseProxy": {
    "Routes": [
      {
        "ClusterId": "cluster1",
        "Match": {
          //"Methods": [ "GET", "POST", "PUT", "HEAD", "OPTIONS", "DELETE" ],
          "Path": "{**catch-all}"
        }
      },
      {
        // matches /something/* and routes to 2 external addresses
        "ClusterId": "cluster2",
        "Match": {
          "Path": "/something/{*any}"
        }
      }
    ],
  "Clusters": {
      "cluster1": {
        "Destinations": {
          "cluster1/destination1": {
            "Address": "http://localhost:44339/"
          }
        }
      },
      "cluster2": {
        "Destinations": {
          "first_destination": {
            "Address": "https://baidu.com"
          },
          "another_destination": {
            "Address": "https://bing.com"
          }
        },
        "LoadBalancingPolicy": "PowerOfTwoChoices"
      }

    }
  }
}

测试结果

默认：https://localhost:44370

https://localhost:44370/somthing

它将重定向到 bing 站点。

【讨论】：