Use Fiddler on localhost only

Question

Is there a way to set Fiddler software to log only "localhost" and not all the web traffic ?

Thanks,

nadavy · Accepted Answer · 2012-02-20T17:18:50.870

67

Yes you can. Fiddler has a filters option in which you can specify the name of your computer. Here's the steps:

Make sure you have the latest version of fiddler
Click on the "Filters" tab (in the same line of Inspectors).
Click on "Use Filters"
In the text area enter the name of your computer.
Left click on the request area (so it will be saved).

If everything went well, fiddler has a green arrow on the Filters tab. Just browse to the website using your machine name so instead of:

http://localhost/MySite

Go to

http://my-machine-name/MySite

edited Feb 20 '12 at 17:18

answered Feb 20 '12 at 11:19

nadavy

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Just entering "localhost" in the text area worked fine for me. – Diego Mijelshon Jul 19 '13 at 13:34
Maybe this issue was fixed in a newer version of fiddler - I'm not sure since I haven't used it for quite a while. In older versions it wasn't possible. – nadavy Jul 31 '13 at 08:07

score 37 · Answer 2 · answered Apr 16 '13 at 11:11

37

I found these ways to only log localhost traffic, either should work.

'Show only Intranet Hosts', which excludes hostnames with a dot in them

Filters > Show only Intranet Hosts

'Show only the following Hosts' just specify only to log localhost as below

specify only to log localhost

answered Apr 16 '13 at 11:11

politus

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Like @nadavy's answer but with a screenshot? – CodeCaster Apr 16 '13 at 11:31
10

that right, but I found it helpful to know you didn't need to use your machine name. You can use the same approach just using 'localhost' – politus Apr 16 '13 at 13:54
3

I upvoted this one because of images made it clearer. – garfbradaz Jul 11 '16 at 10:46

Adrian Iftode · Answer 3 · 2012-02-20T11:13:28.833

2

Here you can find how.

When I test local websites I usually add an entry in the hosts file %systemroot%\System32\drivers\etc\hosts

127.0.0.1   somewebsite

And then I set the bindings on IIS 7 to point to somewebsite
So I can test using "http://somewebsite". Fiddler tracks this.

update

To show only the localhost traffic:
Go to Rules\Customize Rules...
On Handlers class add this menu option

...
    class Handlers
    {

        public static RulesOption("Show Localhost Only")
        var m_ShowLocalHostOnly: boolean = false;
....

On the function OnBeforeRequest

... static function OnBeforeRequest(oSession: Session) {

    // Hide requests based on target hostname.
if (m_ShowLocalHostOnly && 
            !(oSession.host =="127.0.0.1" 
              || oSession.host =="localhost" 
              || oSession.host =="somewebsite"))
            {
        oSession["ui-hide"]="true";
    }

...

Save this file (Ctrl + S), then choose the new option from the Rules menu.

edited Feb 20 '12 at 11:13

answered Feb 20 '12 at 08:09

Adrian Iftode

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The problem is not configure to log local website, but NOT log other. When I go on google.com, I see the log. I'd like see ONLY the localhost. – TheBoubou Feb 20 '12 at 08:24
When I do this and select the rules in the menu. Every web site is blocked (local and not local) : [Fiddler] The socket connection to stackoverflow.com failed. – TheBoubou Feb 20 '12 at 10:58
I don't believe. This is not to avoid processing localhost calls, it's just to hide them on the Fiddler results. You can do the same using the filter instead of the custom script. – m3nda Apr 17 '15 at 20:00
@Kris-I Try with `if (m_ShowLocalHostOnly && (oSession.host =="127.0.0.1" || oSession.host =="localhost" || oSession.host =="somewebsite")) { oSession["ui-hide"]="false"; }` – m3nda Apr 17 '15 at 20:01

Use Fiddler on localhost only

3 Answers3