b7c9fcf7a1
This PR was squashed before being merged into the 4.4 branch (closes #32348).
Discussion
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[HttpFoundation] Accept must take the lead for Request::getPreferredFormat()
| Q | A
| ------------- | ---
| Branch? | 4.4
| Bug fix? | yes
| New feature? | no <!-- please update src/**/CHANGELOG.md files -->
| BC breaks? | no <!-- see https://symfony.com/bc -->
| Deprecations? | no <!-- please update UPGRADE-*.md and src/**/CHANGELOG.md files -->
| Tests pass? | yes <!-- please add some, will be required by reviewers -->
| Fixed tickets | n/a
| License | MIT
| Doc PR | n/a
Follow up PR to #32344: if both `Accept` and `Content-Type` are defined, `Accept` must take the lead because it explicitly tells what format the client expect as a response.
Before:
```
$ curl -H 'Accept: application/json' -H 'Content-Type: text/xml' -i 'https://127.0.0.1:8000/userinfo'
[snip]
content-type: text/xml
```
After:
```
$ curl -H 'Accept: application/json' -H 'Content-Type: text/xml' -i 'https://127.0.0.1:8000/userinfo'
[snip]
content-type: application/json
```
Actually, I'm not sure that inferring the content type of the response using the `Content-Type` provided for the request body is a good idea. The HTTP RFC explicitly states that `Accept` must be used to hint a preferred response format (`Content-Type` on the request indicates the type of associated its the body). I would be in favor of being more conservative: use `Accept` if provided (a best practice anyway), and fallback to the default value (HTML by default) otherwise. WDYT?
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