…or (hallboav)

This PR was merged into the 5.1-dev branch.

Discussion
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[HttpClient] adding NoPrivateNetworkHttpClient decorator

| Q             | A
| ------------- | ---
| Branch?       | master
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

The purpose of NoPrivateNetworkHttpClient is for block requests to private networks by default or block one or more subnetwork if specified. NoPrivateNetworkHttpClient accepts two arguments, first one is a HttpClientInterface instance and subnetworks as a second argument.
Second argument $subnets can be null for blocking requests to private networks, or string to specify a single subnet of array for a set of subnets.

```php
<?php

use Symfony\Component\HttpClient\HttpClient;
use Symfony\Component\HttpClient\NoPrivateNetworkHttpClient;

$client = new NoPrivateNetworkHttpClient(HttpClient::create());
// You can request public networks normally using the code above
$client->request('GET', 'https://symfony.com/');

// Requests to private neworks will be blocked because second argument ($subnets) is null
$client->request('GET', 'http://localhost/');

// If we request from 104.26.14.0 to 104.26.15.255 we'll get an exception, since I'm specifying a subnetwork
$client = new NoPrivateNetworkHttpClient(HttpClient::create(), ['104.26.14.0/23']);

// Let's suppose that our DNS server resolves symfony.com to 104.26.14.6, then the following request will be blocked
$client->request('GET', 'https://symfony.com/');
```

Commits
-------

63fec80 [HttpClient] adding NoPrivateNetworkHttpClient decorator

…r1337)

This PR was squashed before being merged into the 6.3 branch.

Discussion
----------

[HttpFoundation] Add IpUtils::isPrivateIp

| Q             | A
| ------------- | ---
| Branch?       | 6.3
| Bug fix?      | no
| New feature?  | yes
| Deprecations? | no
| Tickets       | N/A
| License       | MIT
| Doc PR        | symfony/symfony-docs#18102

This is only my second PR for this project, so I hope I followed all the guidelines correctly.
Recently I had more and more use cases where I had to make exceptions (mostly rate limiting) for private IP ranges.

Symfony currently does not provide an easy way to check if an IP is private or public but implements such logic internally (private constant) for the [NoPrivateNetworkHttpClient](https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/HttpClient/NoPrivateNetworkHttpClient.php).

This PR intents to make the private subnet list reusable by adding it to [IpUtils](https://github.com/symfony/symfony/blob/6.3/src/Symfony/Component/HttpFoundation/IpUtils.php).

In the original PR of the NoPrivateNetworkHttpClient it was also briefly mentioned that this constant may have value when made public. #35566 (comment)

I think symfony should and always should have exposed this constant.

Commits
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6471582 [HttpFoundation] Add IpUtils::isPrivateIp