Luke Wilde 237df9df5c LibWeb: Make extract_header_list_values differentiate parsing failures ...

Previously, parsing failures and the header not existing made
extract_header_list_values return an empty Optional, making it
impossible to differentiate between the two.

Required for implementing CORS-preflight, where parsing failures for
the headers makes it fail, but not having them doesn't make it fail in
all cases.

2023-02-10 22:18:19 +00:00

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