onRequest method
Called when the request is about to be sent.
Implementation
@override
void onRequest(RequestOptions options, RequestInterceptorHandler handler) {
if (!enabled) return handler.next(options);
logPrint([
"REQ ${options.method}: ${options.uri} >>>>>>>>>>>>>",
if (requestHeader) "${options.headers}",
"${options.data}",
if (reqExtra != null) "ERR-EXT ${reqExtra?.call(options)}",
].join('\n'));
return handler.next(options);
}