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trpc-nuxt/docs/content/1.get-started/4.links/1.httpLink.md
2022-12-18 23:31:55 -08:00

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---
title: HTTP Link
description: httpLink is a terminating link that sends a tRPC operation to a tRPC procedure over HTTP.
---
# HTTP Link
`httpLink` is a [terminating link](https://trpc.io/docs/links#the-terminating-link) that sends a tRPC operation to a tRPC procedure over HTTP.
`httpLink` supports both POST and GET requests.
::alert{type="info"}
`httpLink` imported from `trpc-nuxt/client` is a convenience wrapper around the original `httpLink` that replaces regular `fetch` with a [`$fetch`](https://nuxt.com/docs/api/utils/dollarfetch) from Nuxt. It also sets the default headers using [`useRequestHeaders`](https://nuxt.com/docs/api/composables/use-request-headers#userequestheaders).
::
## Usage
You can import and add the `httpLink` to the `links` array as such:
```ts
import { createTRPCNuxtClient, httpLink } from 'trpc-nuxt/client'
import type { AppRouter } from '~/server/trpc/routers'
const client = createTRPCNuxtClient<AppRouter>({
links: [
httpLink({
url: '/api/trpc',
}),
],
})
```
## `httpLink` Options
The `httpLink` function takes an options object that has the `HTTPLinkOptions` shape.
```ts
export interface HTTPLinkOptions {
url: string;
/**
* Select headers to pass to `useRequestHeaders`.
*/
pickHeaders?: string[];
/**
* Add ponyfill for fetch.
*/
fetch?: typeof fetch;
/**
* Add ponyfill for AbortController
*/
AbortController?: typeof AbortController | null;
/**
* Headers to be set on outgoing requests or a callback that of said headers
* @link http://trpc.io/docs/v10/header
*/
headers?: HTTPHeaders | (() => HTTPHeaders | Promise<HTTPHeaders>);
}
```