how can i see the get-dictionary header

[shimrit]

hi,
i'm new to sdch, i'm trying to sniff the chrome traffic to see the
sdch headers. i can see the avail-dictionary header but i can't see
the get-dictionary header.
i assume it is saved in some cache, where can i find the dictionary?
can i clean the cache so i can see it comes from the server?

thanks a lot,
shimrit

[Yoav Weiss]

Hi Shimrit,

The Get-Dictionary header is a header sent from server to browser after the client advertised that it accepts SDCH.

If you see the avail-dictionary headers, your browser already requested and received the dictionary.

Cleaning the cache (plus possibly a browser restart) will cause the browser to "forget" the dictionary. Then you should be able to see the server sends a "Get-Dictionary" header and the browser requests that resource.

Yoav

---------------------------

http://blog.yoav.ws

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[Shimrit Tzur]

wow, thanks a lot.

how do i clean the cache?

do you know where can i find it? is it saved somewhere on my hard disk?

thanks again,

Shimrit

[Yoav Weiss]

You can clean the cache through: "Preferences"->"under the hood"->"clear browsing data"

Ctrl+Shift+del also does the trick

[Shimrit Tzur]

thanks a lot!

[Shimrit Tzur]

still can't see the get-dictionary header, only avail-dictionary...

i cleaned the browsing data, maybe the sdch cache is somewhere else?

 thanks again.

[Jim R]

Try exiting the browser, and then restarting.

The first attempted load from a page supporting SDCH should include the get-dictionary header.

To see if you've "missed" the load (already), visit:

about:histograms/Dictionary

You'll see (after you've loaded at least one dictionary) a histogram of the sizes of dictionaries loaded.   The page will look something like:

Histogram: Sdch3.Dictionary size loaded recorded 1 samples, average = 96018.0 (flags = 0x1)
0      ... 
83848  ------------------------------------------------------------------------O (1 = 100.0%) {0.0%}
110434 ... 

The above shows I've loaded one dictionary (1 sample), and the average size was 96K.  This sample appears in the histogram bucket with the range form 83484 to 110434.

Hope that helps,

Jim