[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

Inizia da com/microsoft/playwright/impl/RouteImpl.java alla riga 214 e segui come route.fulfill gestisce Map<String, String> e List. Confronta il comportamento con response.allHeaders() e response.headersArray(); il lavoro è completato quando route.fulfill può preservare i nomi degli header ripetuti attraverso entrambe le forme di input richieste.