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From Dean Gaudet <>
Subject Re: [DOC] undocumented ContentDigest directive
Date Sun, 24 Aug 1997 21:14:02 GMT
It's pretty easy to make this efficient if you were to write a module
which cached the results of the digest.  Use something like msql, or
anything that can have multiple concurrent writers.


On Sun, 24 Aug 1997, Alexei Kosut wrote:

> On Sun, 24 Aug 1997, Lars Eilebrecht wrote:
> > the ContentDigest directive is available since the first versions
> > of Apache, but still undocumented.
> > Attached is a patch to add it to the manual.
> No, only since 1.1 or so. And -1 on adding it to the manual. It's an
> undocumented feature. It was a bit proof-of-content code I added to
> Apache, and was never designed to be used in a real web server. I forget
> why - there's nothing insecure or anything about it - but I think it had to
> do with performance (or lack thereof). Also, I am aware of 0 web browsers
> that make use of it.
> It's only possible use is to make sure a message wasn't truncated in
> transit (since if the message can be changed, so can the hash, and TCP
> has its own mechanisms to prevent data from being corrupted, so that's
> not a concern), but Apache only applies it to files served by the core,
> which all have Content-Length statements anyhow. And HTTP/1.1 provides
> chunking to all other files, anyway.
> So there's really no use for it.
> -- Alexei Kosut <>

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