https://help.syncfusion.com/cr/document-processing/Syncfusion.HtmlConverter.HttpRequestHeaderCollection.html
HttpRequestHeaderCollection Class - FileFormats API Reference | Syncfusion
Represents a collection of the HTTP request headers
api referenceclasssyncfusion
https://learn.microsoft.com/ja-jp/uwp/api/windows.web.http.headers.httprequestheadercollection?view=winrt-28000
HttpRequestHeaderCollection Class (Windows.Web.Http.Headers) - Windows apps | Microsoft Learn
Provides a collection of the HTTP headers associated with an HTTP request.
http headersclasswindowswebapps