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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GFDL-1.3-no-invariants-only
/*!
\ingroup qthttpserver-examples
\title RESTful API Server
\examplecategory {Web Technologies}
\brief Example of how to create a RESTful API server using the QHttpServer.
\image restful-color-palette-server-example.png
\example colorpalette
This example shows how to create and host simple RESTful web APIs in a small
application using the QHttpServer class. This server accepts calls in REST
style and can be used with its counterpart example
\l {Qt Quick Demo - RESTful API client} {RESTful Color Palette API client}
on the client side.
An application that obeys the REST constraints may be informally described as
RESTful. The RESTful API Server allows create, read, update and delete
operations of colors (unknown resource to be compatible with Reqres API) and
users. The RESTful API Server also provides login/logout functionality.
The example is based on \l {https://reqres.in/}{Reqres API}.
To run the server application, execute server binary:
\code
./colorpaletteserver
\endcode
or
\code
./colorpaletteserver --port 1234
\endcode
An optional \c port parameter may be provided to specify the port
on which the server shall run.
\snippet colorpalette/main.cpp GET paginated list example
In the example above, the route is specified for the GET method,
which returns the JSON array with paginated list of items stored.
To achieve that, the \l QHttpServer::route() method is used with the
\l QHttpServerRequest::Method::Get enumeration.
\snippet colorpalette/main.cpp GET single item example
To get a single item from the list of entities, the item ID is passed
in the request query.
\snippet colorpalette/main.cpp POST example
In this example, the route accepts POST method, which adds a new entry to
the item list and returns a JSON object that represents the added entry.
This request must be authorized. To authorize the request the value of
the header \c TOKEN must be equal to previously returned token from
the \c api/login or the \c api/register methods.
\snippet colorpalette/apibehavior.h POST return different status code example
Besides new entry as JSON object POST methods returns also different
HTTP status code: \c Created for new entries, or \c AlreadyReported for pre-existing entries.
This example makes use of an overload of QHttpServerResponse::QHttpServerResponse
to send a JSON object and corresponding HTTP status code.
To create an entry, the request body must be a JSON object with
\c email \c first_name \c last_name and \c avatar fields - to create new users.
For example:
\code
{
"email": "jane.doe@qt.io",
"first_name": "Jane",
"last_name": "Doe",
"avatar": "/img/faces/1-image.jpg"
}
\endcode
*/
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