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From "Benoit Chesneau (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (COUCHDB-2052) Add API for discovering feature availability
Date Fri, 07 Feb 2014 16:28:19 GMT

    [ https://issues.apache.org/jira/browse/COUCHDB-2052?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13894693#comment-13894693
] 

Benoit Chesneau commented on COUCHDB-2052:
------------------------------------------

[~snej] agree it/I may have been too far. Also [~rnewson] is right this
is smth we do in the replicator too, but maybe we can improved it a
litte.

I am thinking that the faster answer to your problem would be listing
all the URI we have on a node associated to the vendor id and version.
 Then the client can recover these informations and use them to setup
itself. Definitely +1 for it. imo having a json on / that return

{
    vendor_id,
    vendor_url,
    version,
    resources: [
        "/"
        "/{dbname}/"
        ...    
    ],

}

This exactly what doess the HOST Meta RFC:

http://tools.ietf.org/search/rfc6415

The project unhosted is doing a similar thing.

I would be +1 for such solutions. 


(I will continue the discussion on the ml which another topic)

> Add API for discovering feature availability
> --------------------------------------------
>
>                 Key: COUCHDB-2052
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-2052
>             Project: CouchDB
>          Issue Type: Improvement
>      Security Level: public(Regular issues) 
>          Components: HTTP Interface
>            Reporter: Jens Alfke
>
> I propose adding to the response of "GET /" a property called "features" or "extensions"
whose value is an array of strings, each string being an agreed-upon identifier of a specific
optional feature. For example:
> 	{"couchdb": "welcome", "features": ["_bulk_get", "persona"]}, "vendor": …
> Rationale:
> Features are being added to CouchDB over time, plug-ins may add features, and there are
compatible servers that may have nonstandard features (like _bulk_get). But there isn't a
clear way for a client (which might be another server's replicator) to determine what features
a server has. Currently a client looking at the response of a GET / has to figure out what
server and version thereof it's talking to, and then has to consult hardcoded knowledge that
version X of server Y supports feature Z.
> (True, you can often get away without needing to check, by assuming a feature exists
but falling back to standard behavior if you get an error. But not all features may be so
easy to detect — the behavior of an unaware server might be to ignore the feature and do
the wrong thing, rather than returning an error — and anyway this adds extra round-trips
that slow down the operation.)



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