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From Adam Kocoloski <kocol...@apache.org>
Subject Re: multiple view requests
Date Tue, 11 Jan 2011 21:41:25 GMT
The POST computes a proper ETag.  I believe the multi-key lookups can be done with GET provided
you don't exceed the URL length limit.  I'm not sure how I'd want to do a multi-query GET
request.  I'd have to see an example.

Adam

On Jan 11, 2011, at 3:56 PM, Chad George wrote:

> Is it worth having both a Get / URL encoded option and a POST option to take
> advantage of caching. Or would we still be able to use ETags with POST?
> 
> 
> On Tue, Jan 11, 2011 at 3:07 PM, Adam Kocoloski <kocolosk@apache.org> wrote:
> 
>> Hi Alex, I agree, it's awkward.  Note that CouchDB already supports POSTing
>> to a view to select several individual keys.  If I recall correctly that
>> decision came down to the fact that
>> 
>> a) servers put limits on the length of a URL (in mochiweb at the time it
>> was 8KB)
>> b) GET requests with bodies are not well-supported
>> 
>> so if a user wanted to select hundreds of keys from a view a POST seemed
>> like the path of least resistance.  This multi-query support wouldn't
>> introduce any new weirdness in that respect.  I'm open to alternatives,
>> though I think the POST option would probably still go forward because it's
>> so similar to existing features.  Best,
>> 
>> Adam
>> 
>> On Jan 11, 2011, at 1:02 PM, Alexandru Popescu ☀ wrote:
>> 
>>> While the feature sounds pretty useful there is something that I
>>> couldn't stop thinking: a POST for a view?
>>> 
>>> I know that sounds purist but on the other hand one of the highest
>>> praised characteristics of CouchDB is its HTTPness. On the other hand
>>> I'm not sure I see all the angles of this feature to come up with a
>>> better proposal. Maybe we could discuss it on #irc and see if there're
>>> better solutions (at least for the general cases).
>>> 
>>> :- alex
>>> 
>>> 
>>> On Tue, Jan 11, 2011 at 5:21 PM, Adam Kocoloski <kocolosk@apache.org>
>> wrote:
>>>> On Jan 11, 2011, at 9:58 AM, Chad George wrote:
>>>> 
>>>>> Is there any work being done on getting multiple views in a single HTTP
>>>>> request. I'm thinking of something similar to the multiple doc API.
>>>>> 
>>>>> I just finished my first significant webapp with couchdb and one of the
>>>>> things that was a little annoying with a javascript client was all the
>>>>> nested async callbacks required to get all the data required for a
>>>>> particular function to process.
>>>>> 
>>>>> Sometimes this was 3 or 4 nested view lookups, and gracefully handling
>>>>> errors is difficult. It would be much easier if I could pack them into
>> a
>>>>> single async call to couchdb then handle errors or success just once.
>>>>> 
>>>>> This isn't really a critical feature since it can be done with multiple
>>>>> requests, I'm not even sure it has the performance benefits that the
>>>>> multi-doc api has ... but it certainly would be handy to have around
>> when we
>>>>> need it.
>>>>> 
>>>>> 
>>>>> - Chad
>>>> 
>>>> Hi Chad, I did some work on submitting multiple queries to a single view
>> in one POST to that view.  I'll try to clean it up and submit the patch this
>> week.  Multiple queries to different views in the same view group would be a
>> straightforward extension internally, but I'm not sure what the HTTP API
>> would look like for that.  Queries to different view groups should always
>> require separate requests IMO.
>>>> 
>>>> The case to track this would be
>> https://issues.apache.org/jira/browse/COUCHDB-523 - please feel free to
>> comment, especially if the proposed feature doesn't meet your needs.
>> Cheers,
>>>> 
>>>> Adam
>>>> 
>>>> 
>>>> 
>> 
>> 


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