Automatic content length in Reponse::send() can break some responses #46449
Description
Symfony version(s) affected
6.1
Description
Drupal's Big Pipe module does some custom chunking of responses.
After symfony/http-foundation@38a3244 a content length is automatically added to the response, which breaks the page.
We can workaround this by doing an explicit $this->headers->set('Transfer-Encoding', ''); and might be able to come up with something better in the future, however thought it was worth opening an issue just to document the behaviour change, since it's not impossible other projects are doing something weird like us.
How to reproduce
More discussion on the Drupal.org issue https://www.drupal.org/project/drupal/issues/3276186
To reproduce, install Drupal core, update Symfony to 6.1, enable big pipe module.
Possible Solution
No response
Additional Context
No response