Add UrlHelper section to HttpFoundation docs

[sanderdlm]

I was recently looking for a way to generate absolute URLs for assets in a service, and I finally stumbled upon the UrlHelper class after reading this blog post, but I couldn't find any mention of it in the docs when searching for absolute_url() or anything related.

I then saw this comment on the original PR, but saw no such PR for the docs.

This is my first contribution to the docs so any feedback is welcome.

[gnito-org]

Isn't the more accepted way to generate absolute URLs by using Symfony\Component\Routing\Generator\UrlGeneratorInterface::generate and passing Symfony\Component\Routing\Generator\UrlGeneratorInterface::ABSOLUTE_URL as the third argument?

[sanderdlm]

As far as I know, UrlGeneratorInterface is only used for routes, whileUrlHelper allows you to make any link absolute, provided that you're within a request context in your application (it uses requestStack and requestContext). That explains why the class is under the HttpFoundation component and not Routing.

The use-case is different too. I use it to generate absolute images before I send them to Slack using the Symfony Notifier for example. Combined with the Packages service from the Asset component, you can really easily generate an absolute URL for your image, just like you would with {{ absolute_url(asset(imagePath)) }} in Twig

[gnito-org]

In your code example, please:

• Change Use to use,
• At the top, add a file and namespace (// src/Normalizer/UserApiNormalizer.php and namespace App\Normalizer;).

[gnito-org]

Thank you @dreadnip

[noniagriconomie]

Suggested change

	public function normalize($user, $format = null, array $context = [])
	public function normalize($user): array

as seems not used :)
do not know if we can typehint the $user tho

[sanderdlm]

d829020

[noniagriconomie]

on sf doc, it is tried to keep lines to ~ 70/80 chars then go to new line :)

[sanderdlm]

2c6bb4e