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## Resource: Introduction

## Article: Introduction SDK

## Article Link: https://dev.wix.com/docs/api-reference/assets/http-functions/sdk/introduction.md

## Article Content:

# About HTTP Functions

> **Note:** This API is used to call HTTP functions exposed using the Velo [HTTP Functions](https://dev.wix.com/docs/velo/velo-only-apis/wix-http-functions/introduction.md) API with [authentication context](https://dev.wix.com/docs/rest/assets/http-functions/sdk/authentication-context.md). It is not equivalent to the Velo API.

The `http-functions` module allows you to call HTTP functions exposed using the Velo [HTTP Functions](https://dev.wix.com/docs/velo/velo-only-apis/wix-http-functions/introduction.md) API from your app with authentication. 

Velo HTTP functions allow you to expose the functionality of a Wix site as a service in the form of APIs. If you’ve added functionality to a site with code and want to use it in an app, you can expose HTTP functions and call the APIs in your code. 

Calls made to a site's exposed HTTP functions with the Velo `http-functions` module automatically include [authentication context](https://dev.wix.com/docs/rest/assets/http-functions/sdk/authentication-context.md). This means you can use methods that return different responses based on the user who calls them, such as [`getCurrentMember()`](https://dev.wix.com/docs/sdk/backend-modules/members/members/get-current-member.md), in your HTTP functions.

Your site's HTTP function's prefix defines which SDK method to use to call it. For example, call the HTTP function `get_myFunction()` using [`get()`](https://dev.wix.com/docs/rest/assets/http-functions/sdk/get.md).

## Learn more about custom site APIs and HTTP functions
- [About custom site APIs](https://dev.wix.com/docs/develop-websites/articles/coding-with-velo/integrations/exposing-services/about-custom-site-apis.md)
- [Write an HTTP Function](https://dev.wix.com/docs/develop-websites/articles/coding-with-velo/integrations/exposing-services/write-an-http-function.md)
- [Methods for HTTP Functions](https://dev.wix.com/docs/develop-websites/articles/coding-with-velo/integrations/exposing-services/methods-for-http-functions.md)