Questions on Fiddler Forum

1 answer

130 views

Hello,

I have successfully setup Fiddler Everywhere on my iMac as proxy, installed certificate and can watch traffic from my iPhone to HTTPS-sites using Chrome or Safari. Great!

But I would like to inspect traffic of other apps – like Find My – to Apple's servers. The app says "Find My not available, check network connection". It seems that the requests are blocked because the CRT is not valid for app traffic, just for browsers?!

Please advise, any help is greatly appeciated.

Regards

Döner

Fiddler Everywhere

answered on 12 Jan 2024

1 answer

48 views

FiddlerCore - Decrypt only some HTTPS requests

Hi, is it possible to only decrypt some HTTPS requests?
I only need to decrypt some specific, and since using

.DecryptSSL()

Will decrypt all HTTPS traffic, which is what I don't want. I only need to decrypt on specific URLs.
I found this example: https://docs.telerik.com/fiddlercore/basic-usage/capture-https-traffic#fiddlerapplicationbeforeresponse
But it looks to be for the actual Fiddler Application, not for the Core version, so I'm not sure if it will work, will the <session>.uriContains even work if DecryptSSL is not enabled, will it even find the sessions?

Thanks

FiddlerCore

answered on 04 Jan 2024

0 answers

24 views

Is there a x-breakresponse in FiddlerCore?

static function OnBeforeRequest(oSession: Session) {      
        if (oSession.uriContains("/teste.json")) {     
            oSession["x-breakresponse"]="uri";                         
        }

I need to make a change to the text of a file that is large and if I do it the normal way this change doesn't happen, I think I don't have time to edit the response and that's why it loads without changing. Because in small files it replaces the normal load on the page with the modified response. Is there any way to get around this? Thanks.

FiddlerCore

asked on 01 Jan 2024

1 answer

52 views

Custom rules loaded from a external program.

I will try to be very precise in the question. I have a C# program that uses fiddler, but I want to be able to modify the fiddler script using the program for example. When opening the program it would load the script I need into fiddler or edit it within fiddler automatically. I would like to know if there is a way to do this? Automatically load or edit the rules script in real time using an external program. I prefer to edit because unpacking the custom rules in the folder generally has difficulties as Windows blocks file modifications, etc. Thanks.

Fiddler Classic

answered on 01 Jan 2024

1 answer

38 views

How can I ignore the first request for the same URL

How can I ignore the first request for the same URL with fiddler auto responder

I want auto responder to work with the 2nd request from the same url

Fiddler Classic

answered on 28 Dec 2023

1 answer

52 views

Please Delete My Account

Please Delete My Account I Dont Know How To.

Fiddler Everywhere

Windows

answered on 26 Dec 2023

1 answer

58 views

Why origin and/or referer values are null?

Hi Fiddler Team,

I'm conducting an analysis on origin referer and have 4 scenarios:

No Origin, No Referer

No Origin, Referer Present

Origin Present, Referer Missing

Origin Present, Referer Present

Can you please help me to understand why origin and / or referer are missing (scenarios 1-3)?

Thanks!

Fiddler Classic

answered on 23 Dec 2023

2 answers

56 views

How to redirect unpkg.com to unpkg.zhimg.com?

In my network environment, I cannot access unpkg.com, which causes some of my web pages to load improperly. I can access unpkg.zhimg.com, which can replace unpkg.com. Therefore, I'm wondering if I can use Fiddler to replace all accesses to unpkg.com with accesses to unpkg.zhimg.com. To do this, I used the following code in FiddlerScript:

if (oSession.HTTPMethodIs("CONNECT") && (oSession.PathAndQuery == "unpkg.com:443")) { 
          oSession.PathAndQuery = "unpkg.zhimg.com:443"; 
}

if (oSession.HostnameIs("unpkg.com")) oSession.hostname = "unpkg.zhimg.com";

When I try to access unpkg.com, I encounter the following error:

"fiddler.network.https> HTTPS handshake to unpkg.com (for #2) failed. System.Security.Authentication.AuthenticationException."

From the error message, it seems like Fiddler is still attempting to establish a connection with unpkg.com before accessing unpkg.zhimg.com. Is it possible to configure Fiddler to directly access unpkg.zhimg.com without attempting to connect to unpkg.com first?

Fiddler Classic

answered on 19 Dec 2023

1 answer

134 views

blocking fiddler from interfering with certain apps

hi, i am new to fiddler and i only use it to set up some private servers for games, and it ends up logging data from all my active apps even chrome, is there a way to stop fiddler from touching chrome/other apps while it only works with my games? even when i am on discord i have a hard time on calls because fiddler is on and i have to turn it off to make the voice call work smoothly without issues, is there a way i can block fiddler from interfering with discord?

Fiddler Classic

answered on 18 Dec 2023

1 answer

109 views

Outlook 356 App and Fiddler Classic

My client said that they are having issues with Outlook 365 via the local Outlook app when Fiddler is also open/running.

The client goes to open outlook and it just sits and spins and never opens. But as soon as she closed out of Fiddler, she was able to open email no problem. They have even had to reboot their computer in order to open Outlook.

See attached for how I have their settings set up.

Fiddler Classic