HTTP

import { WranglerConfig } from "~/components";

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
}

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"
		}
	]
}

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;
  }
};

:::