[HttpFoundation] fixed regression in the way the request format is handled for duplicated requests (closes #8917)
merged branch fabpot/format-fix (PR #8961)

This PR was merged into the 2.2 branch.

Discussion
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fixed regression in the way the request format is handled

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #8917
| License       | MIT
| Doc PR        | n/a

Commits
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719b2bf [HttpFoundation] fixed regression in the way the request format is handled for duplicated requests (closes #8917)
[HttpKernel] made code more reliable