HTTP (3)

Last updated Oct 12, 2026 Worker A that declares a Service binding to Worker B can forward a Request object to Worker B, by calling the fetch() method that is exposed on the binding object.

For example, consider the following Worker that implements a fetch() handler:

{
    "$schema": "./node_modules/wrangler/config-schema.json",
    "name": "worker_b",
    "main": "./src/workerB.js",
    "upload_source_maps": true
}

"$schema" = "./node_modules/wrangler/config-schema.json"
name = "worker_b"
main = "./src/workerB.js"
upload_source_maps = true

export default {
  async fetch(request, env, ctx) {
    return new Response("Hello World!");
  }
}

The following Worker declares a binding to the Worker above:

{
    "$schema": "./node_modules/wrangler/config-schema.json",
    "name": "worker_a",
    "main": "./src/workerA.js",
    "upload_source_maps": true,
    "services": [
        {
            "binding": "WORKER_B",
            "service": "worker_b"
        }
    ]
}

"$schema" = "./node_modules/wrangler/config-schema.json"
name = "worker_a"
main = "./src/workerA.js"
upload_source_maps = true

[[services]]
binding = "WORKER_B"
service = "worker_b"

And then can forward a request to it:

export default {
    async fetch(request, env) {
        return await env.WORKER_B.fetch(request);
    },
};

Note

If you construct a new request manually, rather than forwarding an existing one, ensure that you provide a valid and fully-qualified URL with a hostname. For example:

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;
  }
};

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HTTP (3) - 图1Docs

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description: Facilitate Worker-to-Worker communication via RPC. title: RPC (WorkerEntrypoint) image: https://developers.cloudflare.com/workers/runtime-apis/bindings/service-bindings/rpc/og.png?v=3b4498d1f4ea0bc6

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