1 reply

Is it possible to invoke API for a private Worker using HTTP Service bindings?

Is it possible to make arbitrary API requests from the frontend to the backend using the worker's HTTP Service Bindings?
In a typical use case, it is known that a request to a worker can be forwarded to another worker.
It is also stated that arbitrary requests can be made by providing a fully qualified URL as shown below.

via https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/http/

export default {
  async fetch(request, env) {
    // provide a valid URL
    let newRequest = new Request("https://valid-url.com", { method: "GET" });
    let response = await env.WORKER_B.fetch(newRequest);
    return response;
  }
};

export default {
  async fetch(request, env) {
    // provide a valid URL
    let newRequest = new Request("https://valid-url.com", { method: "GET" });
    let response = await env.WORKER_B.fetch(newRequest);
    return response;
  }
};

If let

workers_dev=false

workers_dev=false

WORKER_B

WORKER_B

and hide the hostname, can we use

fetch

fetch

to call any API on

WORKER_B

WORKER_B

?
Or should we use RPC for this use case?

Assumed usercase:

sequenceDiagram
    User ->> Frontend (WORKER_A): GET /
    Frontend (WORKER_A)  ->> Backend (WORKER_B): GET /api/user

sequenceDiagram
    User ->> Frontend (WORKER_A): GET /
    Frontend (WORKER_A)  ->> Backend (WORKER_B): GET /api/user

Cloudflare Docs

HTTP

Facilitate Worker-to-Worker communication by forwarding Request objects.

Cloudflare Developers•7mo ago•

1 reply

ryok

Is it possible to invoke API for a private Worker using HTTP Service bindings?

export default {
  async fetch(request, env) {
    // provide a valid URL
    let newRequest = new Request("https://valid-url.com", { method: "GET" });
    let response = await env.WORKER_B.fetch(newRequest);
    return response;
  }
};

export default {
  async fetch(request, env) {
    // provide a valid URL
    let newRequest = new Request("https://valid-url.com", { method: "GET" });
    let response = await env.WORKER_B.fetch(newRequest);
    return response;
  }
};

If let

workers_dev=false

workers_dev=false

WORKER_B

WORKER_B

and hide the hostname, can we use

fetch

fetch

to call any API on

WORKER_B

WORKER_B

?
Or should we use RPC for this use case?

Assumed usercase:

sequenceDiagram
    User ->> Frontend (WORKER_A): GET /
    Frontend (WORKER_A)  ->> Backend (WORKER_B): GET /api/user

sequenceDiagram
    User ->> Frontend (WORKER_A): GET /
    Frontend (WORKER_A)  ->> Backend (WORKER_B): GET /api/user

Cloudflare Docs

HTTP

Facilitate Worker-to-Worker communication by forwarding Request objects.

Is it possible to invoke API for a private Worker using HTTP Service bindings?

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