---
title: Introduction
slug: custom-main-prod/introduction
createdAt: 2025-06-24T07:42:25.130Z
---

This is a sample server Petstore server.
You can find out more about Swagger at
[http://swagger.io](http://swagger.io) or on [irc.freenode.net, #swagger](http://swagger.io/irc/).
For this sample, you can use the api key `special-key` to test the authorization filters.

# Introduction

This API is documented in **OpenAPI format** and is based on
[Petstore sample](http://petstore.swagger.io/) provided by [swagger.io](http://swagger.io) team.
It was **extended** to illustrate features of [generator-openapi-repo](https://github.com/Rebilly/generator-openapi-repo)
tool and [ReDoc](https://github.com/Redocly/redoc) documentation. In addition to standard
OpenAPI syntax we use a few [vendor extensions](https://github.com/Redocly/redoc/blob/main/docs/redoc-vendor-extensions.md).

# OpenAPI Specification

This API is documented in **OpenAPI format** and is based on
[Petstore sample](http://petstore.swagger.io/) provided by [swagger.io](http://swagger.io) team.
It was **extended** to illustrate features of [generator-openapi-repo](https://github.com/Rebilly/generator-openapi-repo)
tool and [ReDoc](https://github.com/Redocly/redoc) documentation. In addition to standard
OpenAPI syntax we use a few [vendor extensions](https://github.com/Redocly/redoc/blob/main/docs/redoc-vendor-extensions.md).

# Cross-Origin Resource Sharing

This API features Cross-Origin Resource Sharing (CORS) implemented in compliance with  [W3C spec](https://www.w3.org/TR/cors/).
And that allows cross-domain communication from the browser.
All responses have a wildcard same-origin which makes them completely public and accessible to everyone, including any code on any site.

# Authentication

Petstore offers two forms of authentication:

- API Key
- OAuth2
  OAuth2 - an open protocol to allow secure authorization in a simple
  and standard method from web, mobile and desktop applications.

:::Iframe{code="<SecurityDefinitions />"}

:::