Change information inside packets

[Marco]

Hi at all !
I'm studying Fiddler and I'm trying to know what can I do with it.
My questions are :

1. Can I change "User-Agent" value when I receive a particular packet ?
2. Can I change "Request URI" value when I receive a particular packet ?
3. In general case, Can I change every field value when I receive a particular packet ?
​

[Eric Lawrence]

Hi, Marco--

The term "packet" is related to TCP/IP, a lower-level protocol, and it's not really related to what you're asking.

Yes, Fiddler can modify any outbound request body or header, and can modify any inbound response body or header. That's why it's called "Fiddler"-- because it can fiddle with such things.

You can make modifications manually, using the UI, or via script.

http://docs.telerik.com/fiddler/KnowledgeBase/FiddlerScript/ModifyRequestOrResponse

Regards,
Eric Lawrence
Telerik

 

 

[Marco]

Thank you very much for your help !
Listen, can I add inside packet HTTP this line ? X-Common-idcode : AP354L\r\n

[Eric Lawrence]

I will reiterate that HTTP is not a "packet".

If you're asking how to add the request header shown below, you can use Fiddler's FILTERS tab, or you can click Rules > Customize Rules, scroll to OnBeforeRequest, and add

   oSession.oRequest.headers["X-Common-idcode"] = "AP345L";

inside that method.

Regards,
Eric Lawrence
Telerik

 

 

[Gene]

Is it possible to see TCP-level information in the standard Fiddler UI?  For example, it would be interesting to see what ephemeral port (unassigned port >1023) my OS has given to a particular HTTP client request.