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Re: Should the default value of url-user-agent include a version number?

From: Clément Pit--Claudel
Subject: Re: Should the default value of url-user-agent include a version number? What about the specific case of package.el?
Date: Wed, 6 Apr 2016 07:37:35 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 04/06/2016 12:56 AM, Richard Stallman wrote:
> [[[ To any NSA and FBI agents reading my email: please consider    ]]]
> [[[ whether defending the US Constitution against all enemies,     ]]]
> [[[ foreign or domestic, requires you to follow Snowden's example. ]]]
>   > I meant IceCat. It sends its precise version, and it reveals that I'm 
> using Firefox. 
> Are you sure?  I don't think so.  I think that string is entirely made up.
> That is what Ruben told me.

I was wrong to say precise version; it seems that it sends its major version 
only :) 

Icecat 31 sends this:
  Mozilla/5.0 (Windows NT 6.1; rv:31.0) Gecko/20100101 Firefox/31.0
Icecat 38 sends this:
  Mozilla/5.0 (Windows NT 6.1; rv:38.0) Gecko/20100101 Firefox/38.0

Additionally, IceCat of course leaks the fact that you're using LibreJS, which 
probably goes a long way towards identifying IceCat. I wonder if profiling the 
list of websites that SpyBlock is blocking would give further information. If 
that's not enough, differences in behaviour between successive versions of 
LibreJs can probably help in pinpointing a precise version.


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