[Feature]: allow to define multiple times the same header in route.fulfill

🚀 Feature Request

There is currently no way to define multiple times the same header in route.fulfill.

I first hoped I could trick it by using different cases but com/microsoft/playwright/impl/RouteImpl.java:214 uses headers.put(h.getKey().toLowerCase(), h.getValue());

I would expect that I can define headers in both ways, via Map<String, String> or via List<HttpHeader> (likewise one can use response.allHeaders() and response.headersArray()

Example

I have a test where I want to make sure that my implementation to detect multiple headers work. That's why I use route.fulfill and would like to define a header multiple times.

Motivation

see above

Beginne mit com/microsoft/playwright/impl/RouteImpl.java in Zeile 214 und verfolge, wie route.fulfill Map<String, String> und List verarbeitet. Vergleiche das Verhalten mit response.allHeaders() und response.headersArray(); abgeschlossen ist die Aufgabe, wenn route.fulfill wiederholte Header-Namen über beide angeforderten Eingabeformen hinweg bewahren kann.