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Description:
In which we discuss the Shared Dictionary Compression over HTTP (SDCH) Google opensource project.
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SDCH and SPDY
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SPDY is equivalent to using HTTPS. And this specification call out that the shared dictionary can not be used with HTTPS: [link] Is it correct then that the two can not be used together?
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why SDCH is used only in searches?
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Hi,
It seems that SDCH has a lot of advantages over other compressions,
like gzip.
So why google uses it only on searches? why not on other google
traffic, like google sites etc.
And another question, efficient compression might be even more
important on cellular devices (to save bandwidth, CPU and battery), is... more »
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SDCH and Chrome
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Hi We have built an SDCH proxy server are in the process of testing.
We are having some issues we are trying to debug but have a problem
with Chrome “locking us out” ie
If Chrome gets some SDCH is does not like it seem to switch it off
completely? Does anyone know if there is a way to stop this from... more »
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SDCH & Google toolbar
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Hi,
In the latest version of Google Toolbar (v.7.0) I can't seem to find
the SDCH add-on in the browser settings, nor do I see any outgoing
"accept-encoding: sdch" in the HTTP headers (even for Google
searches).
Was the SDCH service taken out of the Google Toolbar? If so, are there
any plans for it to come back at later versions?... more »
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SDCH Client plugin
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Hi, I want to write a client plugin for SDCH. It seem hard to change
the Content Encoding header in IE as such maybe this can’t be done as
a simple plugin.
I note that Google toolbar support SDCH as such they must be able to
do this. Does anyone have any ideas. Is the Toolbar source code
available?... more »
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Setting dictionaries for hosts of the format X.Y.domain.com
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Hi,
It seems that when I'm trying to set a dictionary on a host of the
format X.Y.domain.com, I get an error of
DICTIONARY_REFERER_URL_HAS_DOT _IN_PREFIX and I'm failing the
Dictionary::CanSet security check function.
From the function's code comments:
A dictionary is invalid and must not be stored if any of the... more »
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SDCH and jetSTREAM Client API
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Hi Group, This may be of interest.
I work for a load balancing / Application Delivery Company called
jetNEXUS ([link])
We have been doing some work with SDCH and will be incorporating it
into our load balancing product. In addition we have written a new
content encoding method called jetSTREAM that uses “some” of the... more »
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An extension to help SDCH opt-out of encoding some content
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Below is a proposal for a "helpful" extension for folks that would like to use SDCH compression, but only want to use it *some* of the time, or on some of the paths on their site, or on some of the content. If you already grok the problem and just want to see the proposed resolution, jump to the end of this post.... more »
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Open source SDCH dictionary generation tool
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As part of work on a tangential project, I have a tool suitable for
building SDCH dictionaries given sample web pages. I would be curious
if anybody can report back results or compare to other tools available
for dictionary generation. I used the tool to generate an sdch
dictionary for google search results pages, training on 50 of the top... more »
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dictionary file and the code table
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Hello all,
As much as i understand, the code table and the values for the copy
instructions should appear in the dictionary file.
I download a dictionary file from a server and after decompressed it,
it seems like the code table is not there.
So, where is the code table? do the client and server use the default... more »
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