site that defends fiddler capture?

[cheolwoo]

When I turn on fiddler capture and go to a specific site, an http 503 error occurs.

It seems that fiddler has been blocked on that site.

Is there a way to capture this site?

 

https://smartstore.naver.com/j-flow

[Nick Iliev]

Hello Cheolwoo,

 

It is hard to say what mechanism the server uses to detect a proxy, but it seems that the status 503 is returned not because of an actual issue with the request or the server but rather for masking the denied requests from the server side. One possible reason is that the server uses a complex functionality to detect if the request comes from the expected client application (e.g., a browser or a mobile app) and not from a third party (in this case, from the Fiddler proxy app). As a side note, the observed behavior (for the mentioned endpoint) is also reproducible with other proxy tools, which confirm the theory that the server is configured to detect and reject request from a thrid-party client applications.

The best approach is to directly contact the server administrators/owners and ask them why the request is being denied while a proxy stands in the middle - they should be able to provide more insights.

 

Regards,
Nick Iliev
Progress Telerik