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Service bindings — HTTP

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:

name = "worker_b"
main = "./src/workerB.js"
export default {
async fetch(request, env, ctx) {
return new Response("Hello World!");

The following Worker declares a binding to the Worker above:

name = "worker_a"
main = "./src/workerA.js"
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);