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

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Silke
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Silke asked on 07 Oct 2020, 01:02 PM

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

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Nick Iliev
Telerik team
answered on 07 Oct 2020, 01:33 PM

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
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