I want to know if it is possible setup fiddler to capture WMS/WFS requests from QGIS and how to do it.

Fiddler is capturing the requests from MapInfo and I don't remember making any setup in fiddler to accomplish that.

So can I make fiddler capture requests from QGIS and how do I do it?

Version info: Fiddler, QGIS 1.7.0

1 Answer 1


Fiddler allow you to capture HTTP traffic acting as a proxy between you and network.

So to capture WMS/WFS requests from any software I believe you have just to run Fiddler as usual. The same way you have done it with MapInfo - no additional configuring is required.

PS I have tested it with ArcGIS Server - successfully capturing REST traffic.


You was right - running fiddler without additional configuration of QGIS did nothing.

I was able to capture traffic from QGIS by navigating to QGIS Settings\Options\Network and checking Use proxy for web access. Then I have setup for Host, 8888 for Port and HttpProxy for Proxy type.

You can use these parameters too or check what Fiddler had setup in Windows Control Panel\Internet Options\Connections\LAN settings\Advanced

I think this is happening because QGIS is not reading system Internet Properties and MapInfo is reading.

  • That was also what I thought I should do, but when I add a WMS layer in QGIS and move the map or zoom in I do not see the requests in fiddler. But when I add a WMS layer in MapInfo and zoom I get all the requests in fiddler.
    – taudorf
    Commented May 22, 2012 at 8:21
  • 1
    Indeed, you was right - additional configuration is required. I have updated my answer. Commented May 22, 2012 at 9:00
  • Thanks for your updated answer. Setting QGIS to use a proxy did the trick for me.
    – taudorf
    Commented May 22, 2012 at 10:36
  • QGIS 2.0 should read the system proxy settings now.
    – Nathan W
    Commented Aug 13, 2013 at 21:56
  • 1
    To clarify Nathan's comment (testing in QGIS 2.2.0), this means that you still have to check the 'Use proxy for web access' option in Settings > Options, but you don't need to fill in any of the fields.
    – nmtoken
    Commented Apr 2, 2014 at 12:05

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