I am using Fiddler Classic strictly for its FiddlerScript capabilities, and I have just learned that the Progress team no longer have any plans to add this awesome functionality to Fiddler Everywhere. This is very sad news for me, as I feel that probably Fiddler's most appreciated feature is dropped all together. I have just installed the Everywhere version, checked out its Rules tab, but I am most positive that all those hard-coded rules will not even come close to the functionality and the simplicity provided by a scripting language. The Rules tab in Everywhere may be a more easier and intuitive option for most users, but this comes at the price of loosing the flexibility and the powerful tools that only a script can provide. The web is becoming more and more complex with each day, and in order for Fiddler to stay on top of it, I believe it should give its users access to the most powerful tools available. Employing scripting capabilities is certainly one of it, if not the best one! Why restrict that?!

I would like to take this opportunity to kindly ask the design team to re-evaluate this decision of dropping this future. It sets Fiddler apart from all the other software out there, and dropping it all together would be a major downgrade for Fiddler, in my opinion. Having a Rules tab for those in need of a quick set-up, and preserving the current scripting capabilities for those looking for powerful functionality seems like the best way to go for me. With these two foundations, I have no doubt Fiddler will continue to stay relevant and grow in the years ahead.

Anyhow, in case no re-evaluation will be made and approved, I would like to know if you have any plans of dropping support/updates for Fiddler Classic in the future. This would be a second blow to all the 10 year+ Fiddler users.

I hope both versions will be offered to us for many years to come, no matter how much the web will be changing. So, please confirm if we can at least rely on Fiddler Classic, as some believe it is only a matter of time until it will be deprecated (including me). For the time being, hopefully the plans to add support for HTTP/2 and TLS 1.3 will indeed materialize (for Fiddler Classic).

If others feel like me on this whole issue, please do comment. Thank you!

Alex

Hi there, I've used Fiddler occasionally for years, but am new to Fiddler Anywhere. I want to use Fiddler to accurately time page load times of my Dynamics 365 CRM system. I used to do this by filtering on the URL of my CRM system, clearing the traffic window, loading a page, clicking Ctrl+A in the traffic window to highlight all the sessions, and then reading off the total time from start to end (currently shown as the Max Duration figure in the Overview Window).

This method is working for me some of the time currently, but only for about one in three page loads that I test. The problem seems to be related to the "Client Connected" time which sometimes doesn't reset for each page load. In the screenshot below, you can see that I clicked the link in my browser at 11:54:12, but the system is providing a timing which starts at 11:53:59 as the Client Connected time. It incorrectly tells me the session lasted 13.67s when it actually only began at the Client Begin Request time and took less than a second to complete.

Is there a way to tell Fiddler Anywhere to ignore the Client Connected time and measure from Client Begin Request instead? Alternatively, can I force my browser to start a new connection each time I load a page (which it seems to sometimes, if I've been idle for a minute or so)?

Any help greatly appreciated,

Best wishes,

Tony

I'm trying to learn about the API that my Amazon Echo device uses when I ask Alexa for information.

So I'd like to be able to run my Echo traffic through Fiddler (classic or everywhere).

But everything I've read requires using a browser or configuring a proxy on the remote device or some other step that I can't do on my Amazon Echo.

So is there some way to configure Fiddler to work in the scenario where I can only do stuff (e.g., VLANs, port mirroring) on an AP/PC-as-hotspot/gateway/router?

Im supporting multiple users who are all reporting that something has changed recently and while they can capture network traffic in Google Chrome and Microsoft Outlook they only get network calls from Fiddler. Tested with VPN and endpoint protection enabled/disabled. Logs captured, screen recordings available if needed.

Environment - Fiddler is deployed using Jamf with extension and proxy.

MacOS - Multiple versions 14.7.X and 15.X

Logs have multiple entries like this

error 09:22:08.150612+0000 com.progress-telerik.fiddler.fiddler-extension (3348778651): No interface found for (edited IP removed), not re-setting the interface

error 09:22:08.242428+0000 com.progress-telerik.fiddler.fiddler-extension (1259812390): No interface found for (edited IP removed), not re-setting the interface

There are some sites like this https://vk.com/ that just because fiddler is open makes the site loop the capcha challenge and not stop doing it. How to resolve this? Thanks.

Video Explaining My Issue


I was trying, as a test run, to capture the traffic from Facebook. I did what someone suggested in my previous post about removing the "https" and just using "facebook." I did that, clicked "Actions," and selected "Run Filter Set Now." I then refreshed the tab I was currently on, which was Facebook, and as you can see in the video link, no traffic was captured.

So, what am I supposed to do if I want to capture only the tab with Facebook traffic ? Do I really have to close my Firefox window, reopen Firefox, and have just one tab open with Facebook? Then, I would use Fiddler Classic. How is this realistic at all?

If anyone can please inform me how I can capture all of Facebook's traffic in the session list without any other traffic being captured-thus sparing me the hassle of sorting through the list to identify which traffic belongs to Facebook- that would be great. Otherwise, I see no reason to continue using Fiddler Classic or to subscribe.

I filtered to show only if the URL contains, as you can see in the image, but no URLs from Facebook are being listed when I refresh the tab that's currently on the Facebook URL.

Here's the error message it told me to paste onto here. I have tried uninstalling and reinstalling Fiddler but nothing changed.

 

---------------------------
Loading custom MIME mappings failed
---------------------------
Fiddler has encountered an unexpected problem. If you believe this is a bug in Fiddler, please copy this message by hitting CTRL+C, and submit a bug report at http://www.telerik.com/forums/fiddler.

The cloud file provider is not running.



Type: System.IO.IOException
Source: mscorlib
   at System.IO.__Error.WinIOError(Int32 errorCode, String maybeFullPath)

   at System.IO.FileStream.ReadCore(Byte[] buffer, Int32 offset, Int32 count)

   at System.IO.FileStream.Read(Byte[] array, Int32 offset, Int32 count)

   at System.Xml.XmlTextReaderImpl.InitStreamInput(Uri baseUri, String baseUriStr, Stream stream, Byte[] bytes, Int32 byteCount, Encoding encoding)

   at System.Xml.XmlTextReaderImpl..ctor(String url, Stream input, XmlNameTable nt)

   at System.Xml.XmlTextReader..ctor(Stream input)

   at System.Xml.Serialization.XmlSerializer.Deserialize(Stream stream)

   at Fiddler.XmlFileMimeMappings..ctor(String filePath)

   at Fiddler.frmViewer.PrepareConsumer(Object info, EventArgs counter)


Fiddler v5.0.20251.1171 (x64 AMD64) [.NET 4.0.30319.42000 on Microsoft Windows NT 10.0.22631.0] 
---------------------------
OK   
---------------------------

I have tried editing the rules on fiddler script editor
static function OnBeforeRequest(oSession: Session) {
// Check if the request URL matches a pattern (for example, you can forward requests to a specific domain)
if (oSession.url.Contains("example.com")) {
// Get the request body (as a string)
var requestBody = oSession.GetRequestBodyAsString();

// Parse the request body as JSON
var data = parseJSON(requestBody);

if (data == null) {
// If the data is not valid JSON, handle the error
oSession.ResponseBody = "Invalid JSON received";
oSession.oResponse.headers["Content-Type"] = "text/plain";
return;
}

// Prepare the data to send to the PHP server
var dataToSend = {
"method": oSession.oRequest.headers["Method"],
"url": oSession.url,
"headers": oSession.oRequest.headers.ToString(),
"body": data
};

// Define the PHP server URL (running on localhost:8000)
var phpServerUrl = "http://localhost:8000/process_request.php";

// Prepare HTTP request to send to the PHP server
var oHTTP = new HTTPRequest(phpServerUrl, "POST", stringifyJSON(dataToSend));

// Send the request
var oResponse = oHTTP.Send();

// Handle the PHP server's response
if (oResponse.StatusCode == 200) {
oSession.ResponseBody = oResponse.Body;
oSession.oResponse.headers["Content-Type"] = "application/json";
}
}
}

But the code doesnt work because JSON object is not recordgnized.
Is there any waY I can broadcast/forward all requests captured that belong to example.com domain?>

i can't find snapshots menu in mac fiddler app. where is it?

i'm using free account now.