Hi all,
I’ve made another update to Fiddler Html Inspector, the Fiddler extension for viewing HTML inefficiencies. I have modified the location of the inspector so that it now appears as a traditional inspector, rather than as a tab. This should improve the experience you all enjoy. As usual, you have access to the full source code.
You can read the earlier posts Part 1 and Part 2 to see how it has progressed.
You can still get the full tabbed version by using the following menu option. Note that the full tabbed version features “history viewing” in that you may go back and forth between graphed items for comparison.
After you’ve toggled this view, you must restart Fiddler for the change to take effect.
Once you have restarted you can see the inspector as it used to be, as a tab:
One last thing to note, if you go to the Log fiddler tab, you will be able to see detailed stats on what is being reported.
Andy



Hi Andy!
I want to tell you the tool is very very good! I have used it in previous versions but let me tell you that the last one is not working for me. When I open Fiddler, it throws an error:
Could not load file or assembly “System.Windows.Forms.DataVisualization, Version=3.5.0.0….
Do you have any idea why this could happen? Thanks a lot for your attention.
Have you recently upgraded fiddler? There was a release very recently.
The error sounds like you”re missing a .dll from the folder that the BareWeb.HtmlInspector dll is located in. Check the following locations:
%Program Files%Fiddler2Scripts
%USERPROFILE%My DocumentsFiddler2Scripts
There should be an assembly: System.Windows.Forms.DataVisualization.dll. This is what we use to generate the graphs in the tool.
If not, I”d try to reinstall the Fidder Html Inspector, and see if that helps.
Thanks for using the tool!
Andy
Andy,
I”m getting the same error as Patricia.. Have reinstalled the inspector. System.Windows.Forms.DataVisualization.dll does not exist on HD..
Is that supposed to be part of the msi?
Cheers, Darryl
I stand corrected..the file is in fiddler2/scripts.. But error persists..
Andy,
Issue resolved, installed .NET chart extensions and *poof* problem solved..
Cheers, Darryl
Thanks for the bug report (and posting your fix!)
This was the way we managed to fix Patricia”s problem also.
Can you tell me, did you install the Fiddler HTML Inspector recently? What OS are you using? I would really like to pin down why this has started happening.
Thanks
Andy
I have the same problem on WinXP 32bit with Framework 3.5, hope this help you in tracing
it worked after i copied the System.Windows.Forms.DataVisualization.dll to GAC (c:windowsassembly folder)
I had just installed it the day I posted the message..so that was 05/20. OS is XPSP3..
Same issue here.
Installed Fiddler 2.3.4.4 beta.
Installed HTML inspector.
Got error regarding System.Windows.Forms.DataVisualization.dll
It cannot be simply copied to windows/assembly. Apparently it has to be registered.
Once I installed MSChart for the net framework, things work fine.
Perhaps the issue is not with the installer for HTML inspector, but that the requirement for MSChart should be asserted?
Same issue here.
Installed Fiddler 2.3.4.4 beta.
Installed HTML inspector.
Got error regarding System.Windows.Forms.DataVisualization.dll
It cannot be simply copied to windows/assembly. Apparently it has to be registered.
Once I installed MSChart for the net framework, things work fine.
Perhaps the issue is not with the installer for HTML inspector, but that the requirement for MSChart should be asserted?
I installed the latest component, and it”s definitely a simple dependency issue resolved by the installation of MSChart.exe
Also, Andy may want to go a simple check in his installer to copy the latest copy of fiddler.exe from the fiddler install folder and place that into his Bare Web directory, since it seems the copy placed there is just a static copy of fiddler (unless I installed it incorrectly)
I installed the latest component, and it”s definitely a simple dependency issue resolved by the installation of MSChart.exe
Also, Andy may want to go a simple check in his installer to copy the latest copy of fiddler.exe from the fiddler install folder and place that into his Bare Web directory, since it seems the copy placed there is just a static copy of fiddler (unless I installed it incorrectly)
Actually…the new version of fiddler (2.3.4.5) does not seem to allow you to enter the full screen version of the inspector. Only the tabbed version is accessable
Actually…the new version of fiddler (2.3.4.5) does not seem to allow you to enter the full screen version of the inspector. Only the tabbed version is accessable
Thanks for the tip – installed MS chart controls for 3.5 and error has gone.
Thanks for the tip – installed MS chart controls for 3.5 and error has gone.
I stand corrected..the file is in fiddler2/scripts.. But error persists..
Andy,
Issue resolved, installed .NET chart extensions and *poof* problem solved..
Cheers, Darryl
I have the same problem on WinXP 32bit with Framework 3.5, hope this help you in tracing
it worked after i copied the System.Windows.Forms.DataVisualization.dll to GAC (c:windowsassembly folder)
I had just installed it the day I posted the message..so that was 05/20. OS is XPSP3..
Thanks for the bug report (and posting your fix!)
This was the way we managed to fix Patricia”s problem also.
Can you tell me, did you install the Fiddler HTML Inspector recently? What OS are you using? I would really like to pin down why this has started happening.
Thanks
Andy