🚀 New issue to wemake-services/django-modern-rest by @sobolevn
📝 Support `etag` (#572)


Docs: https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/ETag
Implementation example: https://docs.litestar.dev/latest/usage/responses.html#etag

We already can set etag as a header in @modify with NewHeader.
What do we need exactly?

1. We need ETag dataclass to represent the parsed header. It should also know how to unparse itself into a header
2. We need docs about sending ETag header and getting header If-Match back

#enhancement #good_first_issue #help_wanted #django_modern_rest
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