How can I find out why chrome blocks a request?

Question

I have a tracked down an issue to the point that is clearly related to my request being blocked in the the browser. Is there a way to find out the reason why it got blocked?

It seems to be related to an iFrame, since the the request is only blocked inside the iFrame, but I would like to be able to analyse the details.

Answer 1

1. You can use fiddler or wireshark Wireshark https://www.wireshark.org/

Fiddler https://www.telerik.com/fiddler

2. You can use Microsoft ETL Network logs

•  Create a folder C:\msfiles

•  open an Admin elevated cmd

•  issue the command netsh trace start InternetClient_dbg capture = yes maxsize = 450 filemode = circular persistent = yes overwrite = yes traceFile = C:\msfiles\Etl_trace.etl

•  do your request

•  stop the trace using command netsh trace stop

-> review the Etl_trace.etl