onBeforeSendHeaders
fun onBeforeSendHeaders(filter: WebRequestFilter, listener: (details: OnBeforeSendHeadersListenerDetails, callback: (beforeSendResponse: BeforeSendResponse) -> Unit) -> Unit?)(source)
fun onBeforeSendHeaders(listener: (details: OnBeforeSendHeadersListenerDetails, callback: (beforeSendResponse: BeforeSendResponse) -> Unit) -> Unit?)(source)
The listener will be called with listener(details, callback) before sending an HTTP request, once the request headers are available. This may occur after a TCP connection is made to the server, but before any http data is sent.
The callback has to be called with a response object.