Agent skill

yarp-proxy

Configure YARP reverse proxy for affolterNET.Web.Bff. Use when setting up API proxying, route configuration, or backend service integration.

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Install this agent skill to your Project

npx add-skill https://github.com/majiayu000/claude-skill-registry/tree/main/skills/testing/yarp-proxy-mcafee123-affolternet-web-1805863c

SKILL.md

YARP Reverse Proxy

Configure YARP to proxy requests to backend APIs.

For complete reference, see Library Guide.

Quick Start

appsettings.json

json
{
  "affolterNET": {
    "ReverseProxy": {
      "Routes": {
        "api-route": {
          "ClusterId": "api-cluster",
          "Match": {
            "Path": "/api/{**catch-all}"
          }
        }
      },
      "Clusters": {
        "api-cluster": {
          "Destinations": {
            "api": {
              "Address": "https://api.example.com"
            }
          }
        }
      }
    }
  }
}

How It Works

  1. BFF receives request to /api/...
  2. YARP matches the route pattern
  3. AuthTransform adds bearer token from user session
  4. Request is forwarded to backend API
  5. Response is returned to client

Configuration Options

Routes

json
{
  "Routes": {
    "route-name": {
      "ClusterId": "cluster-name",
      "Match": {
        "Path": "/api/{**catch-all}",
        "Methods": ["GET", "POST"]
      },
      "Transforms": []
    }
  }
}

Clusters

json
{
  "Clusters": {
    "cluster-name": {
      "Destinations": {
        "destination1": {
          "Address": "https://api1.example.com"
        },
        "destination2": {
          "Address": "https://api2.example.com"
        }
      },
      "LoadBalancingPolicy": "RoundRobin"
    }
  }
}

Auth Transform

The BFF automatically adds bearer tokens to proxied requests:

csharp
// Automatically extracts access token from user session
var token = await context.GetTokenAsync("access_token");
// Adds Authorization: Bearer {token} header

Multiple Backend APIs

json
{
  "affolterNET": {
    "ReverseProxy": {
      "Routes": {
        "users-api": {
          "ClusterId": "users",
          "Match": { "Path": "/api/users/{**catch-all}" }
        },
        "orders-api": {
          "ClusterId": "orders",
          "Match": { "Path": "/api/orders/{**catch-all}" }
        }
      },
      "Clusters": {
        "users": {
          "Destinations": {
            "default": { "Address": "https://users-api.example.com" }
          }
        },
        "orders": {
          "Destinations": {
            "default": { "Address": "https://orders-api.example.com" }
          }
        }
      }
    }
  }
}

Path Rewriting

json
{
  "Routes": {
    "api-route": {
      "ClusterId": "api",
      "Match": { "Path": "/bff/api/{**remainder}" },
      "Transforms": [
        { "PathRemovePrefix": "/bff" }
      ]
    }
  }
}

Troubleshooting

502 Bad Gateway

  • Verify backend API is running and accessible
  • Check destination address is correct
  • Review network connectivity between BFF and API

Token not forwarded

  • Ensure user is authenticated
  • Verify access token is in session
  • Check AuthTransform is registered

Route not matched

  • Verify path pattern matches incoming request
  • Check route order (more specific routes first)
  • Enable YARP logging for debugging

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