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ca97ec5099
Previously if you were looking for a given key, the header may incorrectly tell you that it did not exist even though it would return a valid value:
```ruby
env = { "CONTENT_TYPE" => "text/plain" }
headers = ActionDispatch::Http::Headers.new(env)
headers["Content-Type"]
# => "text/plain"
headers.key?("Content-Type")
# => false
```
This PR fixes that behavior by converting the key before checking for presence
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| .. | ||
| abstract_controller | ||
| action_controller | ||
| action_dispatch | ||
| action_pack | ||
| abstract_controller.rb | ||
| action_controller.rb | ||
| action_dispatch.rb | ||
| action_pack.rb | ||