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From "Jens Alfke (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-1368) multipart/related document body doesn't identify which part is which attachment
Date Wed, 14 Nov 2012 20:32:12 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-1368?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13497418#comment-13497418
] 

Jens Alfke commented on COUCHDB-1368:
-------------------------------------

It turns out "Content-ID" is not the correct header to use for the filename, because according
to RFC2045 sec.7, "Content-ID values must be generated to be world-unique". (I didn't know
this when writing up this issue, but discovered it later on while implementing MIME support
for TouchDB. I should have updated this issue too; sorry!)

The most appropriate header to use seems to be Content-Disposition (RFC1806):

    Content-Disposition: attachment; filename="test.txt"

This is what TouchDB generates, and what it will recognize in incoming MIME documents.
                
> multipart/related document body doesn't identify which part is which attachment
> -------------------------------------------------------------------------------
>
>                 Key: COUCHDB-1368
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1368
>             Project: CouchDB
>          Issue Type: Bug
>          Components: HTTP Interface
>            Reporter: Jens Alfke
>            Priority: Minor
>
> If you GET a document with attachments in multipart/related format (by adding ?attachments=true
and setting Accept:multipart/related), the MIME bodies for the attachments have no headers.
This makes it difficult to tell which one is which. Damien says they're in the same order
that they appear in the document's "_attachments" object ... which is fine if you're Erlang,
because Erlang preserves the order of keys in a JSON object, but no other JSON implementation
I know of does that (because they use hashtables instead of linked lists.)
> The upshot is that any non-Erlang code trying to parse such a response will have to do
some by-hand parsing of the JSON data to get the _attachment keys in order.
> This can be fixed by adding a "Content-ID" header to each attachment body, whose value
is the filename. It would be nice if other standard headers were added too, like "Content-Type",
"Content-Length", "Content-Encoding", as this would make it work better with existing MIME
multipart libraries.

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