Dear all,

I am working on a project that requires communicating and transferring files to a server that requires SSL communication. I'm currently developing in C# .NET 4.7.2 and have utilized RestSharp to communicate to this server via POST command. The issue I am running into now is I keep getting a certificate chain error, and I have captured this with fiddler. Fiddler gives me a popup as shown in the attachments. The curious thing is, if I don't have fiddler open, my code will not work and the file transfer fails, however, when fiddler is open and monitoring all processes, it will popup the certificate error, and if I click YES then the file will get transferred correctly.

Can any of the devs provide some insight on how I should implement my code to perform the same behavior that Fiddler does when ignoring unsafe errors? I have searched other resources online and have not been able to find a working solution.

I have found a few blog articles like this one: https://www.telerik.com/blogs/understanding-fiddler-certificate-generators

which have provided some insight but if anyone has more detail on how this implementation works I hope to build something similar like this in my application.

 

Really appreciate your help,

Thank you!

garyd

Cannot sniff python script from command-line anymore after new update.

the script is using python-requests to make a get or post requests.

Last seen working on v5.0.20182.28034

 

 I found that fiddlercore will customize the return content based on the HTTP status code. Can I ban this behavior?

This page has been personalized for various status codes, but Fiddlercore will turn the customized content into Fiddlercore error message. For example, the web 

page will display some contents like "Http status: 502 Fiddler - Connection Failed ajaxOptions: error thrownError..." if the status code is 502. But at this time, I only

 want the page to show that the connection has failed without the specific error message.

I wanna know what can I do to show original customized message in Fiddlercore.

Hi,

 

When i capture JSON files, (for this particular site) i use EXPORT RAW FILES. 

It seems to capture the text i need, Except that each Json file is just one long long line of text..  i created a php script to extract what i need & make it into multiple lines. (however this is a slow process).

 

Is there a way in Fiddler 4, to identify a special character - EG   curly brace { or }  and make it "save" a new-line after (or before) this character.  So when i view the resulting file, is already in multiple lines...

 

 

My Fiddler crashed the last Friday, and after that, something in the background always auto-enable proxy settings in Internet Options even though the Fiddler isn't running, as a result, I couldn't open any web pages and have to manually disable the proxy, but the proxy would be re-enabled again in few minutes and I have to repeat that again and again, any advice to identify and fix that? Thank you.

My Fiddler crashed the last Friday, and after that, something in the background always auto-enable proxy settings in Internet Options even though the Fiddler isn't running, as a result, I couldn't open any web pages and have to manually disable the proxy, but the proxy would be re-enabled again in few minutes and I have to repeat that again and again, any advice to identify and fix that? Thank you.

Hello, i newly install fiddler for log for one week the http trafic. So i configure the auto-save but and put fiddler on my startup folder , but when the software start after a reboot the auto-save are not configure and i need to comeback on the software for configure the auto-save

 

My questions is : Can i script or if there is a option for configure auto-save at the boot of my computer.

 

Thanks for help !

Hello,
I connect fiddler with IOS device. HTTPS is turned on, the certificate is installed couple times.
The connection is fine. I can see the tunnel to...:443. I can also see https/404... but nothing else.
When I started the App, it says unable to connect to the server.
Fiddler only has tunnel to...443.  https://0123movie.net/
But for some reason, I was able to capture the traffic and log-in one time. well, only the once...
I am sure there is nothing different that time. I think Fiddler is acting wired...
Have any suggestion? thank you.

Hey, there! So Ive been using fidler for a while so i decided to try to sniff the requests out from a mobile app. And for some reason it didn't work. I have the certificate and everything set up. So i googled it and i saw one guy who converted the apk of a random apk (Im on android) and put a network_secutity_config.xml file in there that basically tells the app to trust the trusted certificates. It didn't work this way either so im just lost at this point. Do you know anything about this?

Basically the app just doesn't send the requests when sniffing with fiddler. They appear but in some weird ciphered format and it doesn't even give me a response.

I trying to test a simple demo application written in Visual Studio C++. However nothing is logged in Fiddler 4 when the program runs.

I complied the code from here on my Win10 m/c using VS 2017 community:

https://www.codeproject.com/Articles/66625/A-Fully-Featured-Windows-HTTP-Wrapper-in-C

I am running this simple function which does a 'GET'

void SimpleGetTest(void)
{
    wprintf(L"SimpleGetTest\r\n");

    // Set URL.
    WinHttpClient client(L"http://www.codeproject.com/");

    // Send http request, a GET request by default.
    client.SendHttpRequest();

    // The response header.
    wstring httpResponseHeader = client.GetResponseHeader();

    // The response content.
    wstring httpResponseContent = client.GetResponseContent();

    wprintf(L"<%ws>\r\n", httpResponseContent.c_str());
}

 

When I run the program the console output shows HTML response content just fine, Fiddler sees nothing.

 

If I stick "http://www.codeproject.com/" into my Firefox Fiddler does see the traffic ok.

 

I am very new to Fiddler and I downloaded it a few days ago and I am using it with the default settings. Is there some setting I need to change so it sees the traffic from my code?

 

As a matter of interest when I start VS Studio I can see traffic in Fiddler for the connection to Microsoft VS site.