(PECL event >= 1.4.0-beta)
EventHttpRequest::findHeader — Finds the value belonging a header
public EventHttpRequest::findHeader ( string $key , string $type ) : void
Finds the value belonging a header.
key The header name.
type One of EventHttpRequest::*_HEADER constants .
Returns null if header not found.
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https://www.php.net/manual/en/eventhttprequest.findheader.php