(PECL event >= 1.4.0-beta)
EventHttpRequest::addHeader — Adds an HTTP header to the headers of the request
public EventHttpRequest::addHeader ( string $key , string $value , int $type ) : bool
Adds an HTTP header to the headers of the request.
key Header name.
value Header value.
type One of EventHttpRequest::*_HEADER constants .
Returns true on success. Otherwise false.
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https://www.php.net/manual/en/eventhttprequest.addheader.php