Does a fiddler request possibly changes/sets any browser or proxy settings?

[Silke]

Hallo,
I'm stuck with this since weeks so I'm looking for each possible explanation for this scenario:

I open a site with Firefox and it works. I open the same site with Chrome and I do get a 404 response. BUT if I start fiddler and run a request concerning this site, it also works with Chrome - responding with 200 of course. This even lasts when I close fiddler but it stops working as soon as I clear my Chrome Browser settings.

I did check the proxy settings on both browsers. They're both set to 'use system proxy settings'. So I don't have any clue what might cause this behaviour and I'm wondering if I've overseen anything that fiddler has an impact on..
Any help is highly appreciated.
Thanks

[Nick Iliev]

Hi Silke,

 

There are many scenarios where a request might work through Fiddler and won't work otherwise (e.g., in the browser). For example, Fiddler might be using a specific TLS version, which is different from your browser. You could check this article from Eric Lawrence, which covers some cases where you might experience similar behavior.

 

Regards,
Nick Iliev
Progress Telerik