new for Chrome backend. (not available on WebKit).
A shortcut to set the content type when using POST data. If you supply a "content-type" header via headers this will be ignored.
Typical options are application/x-www-form-urlencoded, application/json, or text/plain, Please see https://developer.mozilla.org/en-US/docs/Web/HTTP/Methods/POST for details.
submitted in POST BODY of your request.
custom headers for the taret page. for example, can be used to specify a referer.
if you want to set headers for every sub-resource requested, use the IRequestSettings.customHeaders parameter instead.
valid choices: GET, POST, PATCH, PUT, DELETE or OPTIONS.
The old WebKit backend only supports GET or POST
adjustable parameters for when making network requests to the url specified. used by IPageRequest.