---
title: HTTP
description: Facilitate Worker-to-Worker communication by forwarding Request objects.
image: https://developers.cloudflare.com/dev-products-preview.png
---

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# HTTP

Worker A that declares a Service binding to Worker B can forward a [Request](https://developers.cloudflare.com/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://developers.cloudflare.com/workers/runtime-apis/handlers/fetch/):

* [  wrangler.jsonc ](#tab-panel-12276)
* [  wrangler.toml ](#tab-panel-12277)

JSONC

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

TOML

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

JavaScript

```
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-12278)
* [  wrangler.toml ](#tab-panel-12279)

JSONC

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

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

```
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

```
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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```