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From Robert Newson <rnew...@apache.org>
Subject Re: Storing text/plain attachments and digest
Date Thu, 01 Nov 2012 21:15:40 GMT
CouchDB compresses some attachments (determined by content-type).
"text/plain" is one of them (the full list is in your default.ini file),
and so the MD5 returned is that of the compressed form.


On 1 November 2012 20:49, Mclean, Adam <adam.mclean@rbc.com> wrote:

> Hi list,
>
> I'm working on using couch as a script / configuration file repository.
> Then retrieving the contents as they are updated to various hosts.
>
> The digest produced by the file upload is key to this working for me so
> I'm not replacing files that are already the same in couch.  I've been
> struggling with attachments that are uploaded as content-type
> 'text/plain'.  I haven't been able to match the md5sum that couch shows
> me under any circumstance.  The text/plain I'm sending up is us-ascii
> which to my understanding from an md5sum perspective wouldn't be any
> different represented as UTF-8.
>
> When I upload a file without a content-type of text/plain, I find the
> md5sum representation is accurate.
>
> I've also noticed the headers when retrieving a text/plain attachment
> show as:
> HTTP/1.1 200 OK
> Server: CouchDB/1.2.0 (Erlang OTP/R15B02)
> ETag: "2DvSqQDg7SoM+Su+Ymkt4A=="
> Date: Thu, 01 Nov 2012 20:36:37 GMT
> Content-Type: text/plain
> Content-Length: 8840
> Cache-Control: must-revalidate
> Accept-Ranges: none
>
> Versus something encoded differently:
> Server: CouchDB/1.2.0 (Erlang OTP/R15B02)
> ETag: "tDK39M3il/9xLqnYLosWKg=="
> Date: Thu, 01 Nov 2012 20:44:42 GMT
> Content-Type: application/x-perl
> Content-MD5: tDK39M3il/9xLqnYLosWKg==
> Content-Length: 7080
> Cache-Control: must-revalidate
> Accept-Ranges: bytes
>
> Which produces a 'Content-MD5' that I can verify / duplicate.
>
> What am I missing?  Are md5s not generated for text/plain?
>
> Thanks!
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