---
title: HTTP
description: Facilitate Worker-to-Worker communication by forwarding Request objects.
image: https://edgetunnel-b2h.pages.dev/dev-products-preview.png
---

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# HTTP

Worker A that declares a Service binding to Worker B can forward a [Request](https://edgetunnel-b2h.pages.dev/workers/runtime-apis/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](https://edgetunnel-b2h.pages.dev/workers/runtime-apis/handlers/fetch/):

* [  wrangler.jsonc ](#tab-panel-12832)
* [  wrangler.toml ](#tab-panel-12833)

**JSONC**

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

**TOML**

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

**JavaScript**

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

The following Worker declares a binding to the Worker above:

* [  wrangler.jsonc ](#tab-panel-12834)
* [  wrangler.toml ](#tab-panel-12835)

**JSONC**

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

**TOML**

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


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

And then can forward a request to it:

**JavaScript**

```js
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:

**JavaScript**

```js
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;
  }
};
```

```json
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```