feat(backend): add proxy endpoint

[rozzilla]

Required for this PR in order to properly proxy requests to the right runtime service endpoints

[mcollina]

How would it work?

[rozzilla]

How would it work?

@mcollina on the other PR I will dynamically override the URL used by scalar to do the service call. With this endpoint, I will proxy the requests to the right service runtime...

[mcollina]

This would cause a bad warning if I recall.

[rozzilla]

I don't see any warning when starting the service:

[11:46:21.610] INFO (61130): Starting the service "backend"...
[11:46:22.571] INFO (backend/61130): Typescript compilation completed successfully.
[11:46:22.609] INFO (backend/61130): Server listening at http://127.0.0.1:53680
[11:46:22.610] INFO (61130): Started the service "backend"...
[11:46:22.610] INFO (61130): Starting the service "frontend"...
[11:46:22.690] ERROR (frontend/61130) <STDERR>: The CJS build of Vite's Node API is deprecated. See https://vite.dev/guide/troubleshooting.html#vite-cjs-node-api-deprecated for more details.
[11:46:22.724] INFO (61130): Started the service "frontend"...
[11:46:22.725] INFO (61130): Starting the service "composer"...
[11:46:23.025] INFO (composer/61130): start watching services
    services: [
      {
        "id": "backend",
        "openapi": {
          "url": "/documentation/json",
          "prefix": "/api"
        },
        "proxy": {
          "ws": {},
          "prefix": "/api"
        },
        "origin": "http://backend.plt.local"
      }
    ]
[11:46:23.060] INFO (composer/61130): Server listening at http://127.0.0.1:5042
[11:46:23.061] INFO (61130): Started the service "composer"...
[11:46:23.061] INFO (61130): Platformatic is now listening at http://127.0.0.1:5042

nor when I call the /proxy endpoint:

11:47:30.985] INFO (composer/61130): incoming request
    reqId: "2dd6917b-bb0a-4670-8975-5ee6f1ba3824"
    req: {
      "method": "GET",
      "url": "/api/proxy/61130/services/backend/runtimes/61130/health",
      "host": "localhost:5042",
      "remoteAddress": "127.0.0.1",
      "remotePort": 53730
    }
[11:47:30.986] INFO (composer/61130): fetching from remote server
    reqId: "2dd6917b-bb0a-4670-8975-5ee6f1ba3824"
    source: "/proxy/61130/services/backend/runtimes/61130/health"
[11:47:30.988] INFO (backend/61130): incoming request
    reqId: "006c2c74-36b9-4021-a1d9-35591673137d"
    req: {
      "method": "GET",
      "url": "/proxy/61130/services/backend/runtimes/61130/health",
      "host": "localhost:5042",
      "remoteAddress": "127.0.0.1",
      "remotePort": 53682
    }
[11:47:30.988] INFO (backend/61130): runtime request proxy
    serviceId: "backend"
    injectParams: {
      "method": "GET",
      "url": "/runtimes/61130/health",
      "headers": {
        "host": "backend.plt.local",
        "content-type": "application/json",
        "user-agent": "insomnia/10.2.0",
        "accept": "*/*",
        "x-forwarded-for": "127.0.0.1",
        "x-forwarded-host": "localhost:5042",
        "x-forwarded-proto": "http"
      },
      "query": {}
    }
[11:47:30.994] INFO (backend/61130): incoming request
    reqId: "74153ed0-828e-4f27-9d69-8a85285eb0d4"
    req: {
      "method": "GET",
      "url": "/runtimes/61130/health",
      "host": "localhost:5042",
      "remoteAddress": "127.0.0.1",
      "remotePort": 53731
    }
[11:47:30.999] INFO (backend/61130): request completed
    reqId: "74153ed0-828e-4f27-9d69-8a85285eb0d4"
    res: {
      "statusCode": 200
    }
    responseTime: 3.8473329842090607
[11:47:31.001] INFO (backend/61130): request completed
    reqId: "006c2c74-36b9-4021-a1d9-35591673137d"
    res: {
      "statusCode": 200
    }
    responseTime: 13.16687497496605
[11:47:31.002] INFO (composer/61130): response received
    reqId: "2dd6917b-bb0a-4670-8975-5ee6f1ba3824"
[11:47:31.004] INFO (composer/61130): request completed
    reqId: "2dd6917b-bb0a-4670-8975-5ee6f1ba3824"
    res: {
      "statusCode": 200
    }
    responseTime: 17.654415994882584

[mcollina]

lgtm