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Re: Encrypted Storage on WebDAV
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Re: Encrypted Storage on WebDAV


  • Subject: Re: Encrypted Storage on WebDAV
  • From: email@hidden
  • Date: Wed, 22 Nov 2006 14:17:27 +0100 (MET)

Hi Jim,

The problem is that the PUT method does not support ranges. <http:// lists.w3.org/Archives/Public/ietf-http-wg/1997OctDec/0011.html> gives the reason why PUT-RANGE wasn't left in the HTTP 1.1 specification and <http://www.w3.org/Protocols/HTTP/Issues/ BeforeLastCall.html#PUT-RANGE> is where PUT-RANGE was officially removed from Rev-02 of the HTTP 1.1 spec.

I agree with the reason ranged PUT support was removed from the HTTP 1.1 spec -- there are servers that ignore the Range header on a PUT, and so you'd end up with data loss on those servers.

Ah, I never thought of that kind of problem with partial PUT. This is indeed a valid reason not to support it.


In any event, fixing the WebDAV file systems to handle ranges up and down (once a PATCH method is available) will require a major rewrite (I worked on WebDAV FS for several years, so I know).

I presume WebDAV currently does clever caching to hide the high latency backend from applications requiring something like an mmap interface. I can image that one does not want to rewrite such code...


I suggest you store your secure data on another type of network volume -- AFP, NFS, or SMB.

I think I will go that route. Thanks for your insights.

Michael

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References: 
 >Encrypted Storage on WebDAV (From: email@hidden)
 >Re: Encrypted Storage on WebDAV (From: Jim Luther <email@hidden>)

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