Server Actor Test

Apify MCP server test Server Actor

Test Actor for the Apify MCP server. Not for production use.

It has both interfaces of a Server Actor: an HTTP API documented by an OpenAPI schema (.actor/openapi.json) and an input schema with the same fields as the POST /add body. It has no MCP endpoint. It adds two numbers, the same operation as the other fixtures in this repository: a normal run of normal-actor and the add MCP tool of mcp-server-actor.

What it does

src/main.ts picks the entry path from the run's origin:

• Standby run (metaOrigin === 'STANDBY'): serves the HTTP API on ACTOR_STANDBY_PORT until the platform stops the run.
• Any other run: validates the input (firstNumber, secondNumber), pushes { firstNumber, secondNumber, sum } to the default dataset as one item (the same item POST /add returns), and exits.

Endpoints

Method and path	Response
GET /add?firstNumber=&secondNumber=, POST /add	200 JSON { firstNumber, secondNumber, sum }. Numbers come from the query (GET) or the JSON body (POST). asText=true returns 2 + 3 = 5 as text/plain; asText accepts only true or false, so 1/0 return 400. Other methods return 405.
GET /	Readiness probe (200 ok) when the x-apify-container-server-readiness-probe header is set. Otherwise the echo below.
GET /, POST /	200 JSON echo: method, path, query, headers, body. A JSON body is parsed; other bodies are returned as text. Other methods on / return 405.
GET /status/{code}	That status (400–599) with a JSON { code, error } body.
GET /empty	204, no body, no Content-Type.
GET /text	200 text/plain.
GET /binary	200 application/octet-stream, 256 bytes.
GET /bytes?n=	200 text/plain, exactly n bytes (0 to 1,048,576) of a.
GET /gzip?n=	Same body as /bytes, with Content-Encoding: gzip. n counts decompressed bytes.
GET /delay?ms=	Waits ms milliseconds (0 to 150,000), then 200 JSON { delayedMs }.
GET /redirect	302 with Location: /. The target is fixed and never taken from the request.

Unknown paths return 404 with a JSON { code, error } body; invalid parameters return 400.

What the Apify router changes

Checked on production against a single-tenant deployment:

• Authorization is removed before the request reaches the Actor, so the echo never contains the caller's token header. A token query parameter is consumed as authentication and removed too. A token sent in the POST / body or in another query parameter is echoed.
• X-Apify-Request-Origin is forwarded.
• Status codes, Location, Content-Encoding: gzip bodies and response sizes pass through unchanged. The router does not compress responses itself.
• GET /delay?ms=125000 returns 200 after 125 s, so a 120 s client deadline expires first.
• A request without a token returns 401 from the router.

Example

curl -X POST https://example-server-actor.apify.actor/add \
  -H "Authorization: Bearer $APIFY_TOKEN" -H 'Content-Type: application/json' \
  -d '{"firstNumber": 2, "secondNumber": 3}'
# {"firstNumber":2,"secondNumber":3,"sum":5}

Settings outside actor.json

Set these in Console on the Actor's Settings tab (Actor Standby) in each environment:

• Actor Standby enabled, single-tenant, build latest
• Idle timeout 120 s, memory 256 MB
• Max requests per run 40, desired requests per run 30

The request counts matter: under a burst the router starts extra runs in the caller's account instead of returning 429.

Development

npm install
npm run lint
npm run format
npm run build
npm test

Resources

• Apify MCP server documentation
• Actor Standby