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From Samuel Wan <...@samuelwan.com>
Subject Re: specify Content-Type of a document?
Date Tue, 21 Apr 2009 21:36:07 GMT
Ok, thanks for the confirmation.

That was an interesting trip through the code. CouchDB is absolutely
blowing my mind :-)

-Sam

On Tue, Apr 21, 2009 at 2:23 PM, Paul Davis <paul.joseph.davis@gmail.com> wrote:
> On Tue, Apr 21, 2009 at 4:56 PM, Samuel Wan <sam@samuelwan.com> wrote:
>> Thanks a lot for the pointer, Paul, it would have taken a long time to
>> find otherwise. So lemme see if I got it right...
>>
>> The manual approach is to specify the content type as a member of the
>> _show function's response object:
>>
>> - - - - - - -
>>  return {
>>           "headers" : {
>>             "Content-Type" : "application/xml"
>>           },
>>           "body" : new XML('<xml><node foo="bar"/></xml>')
>>         }
>> - - - - - - -
>>
>> The convenient approach is to use some global variables and helper
>> methods defined by CouchDB's <couchdb>/server/main.js file. One of
>> these methods is registerType, which lets you register a type key with
>> one or more MIME type strings.
>>
>> - - - - - - -
>> registerType("foo", "application/foo", "application/x-foo"); //<--
>> stored to some global associative array defined by main.js
>> - - - - - - -
>>
>> The other helper method is respondsWith, which accepts a second
>> argument (a key-value object) that maps type keys to functions that
>> return different kinds of HTTP responses depending on the type.
>>
>
> That sounds pretty much right. I'll tell Chris to double check when he
> gets back.
>
>> - - - - - - -
>> return respondWith(req, {
>>          html : function() {
>>            return {
>>              body:"Ha ha, you said \"" + doc.word + "\"."
>>            };
>>          },
>>          foo : function() {
>>            return {
>>              body: "foofoo"
>>            };
>>          },
>>          fallback : "html"
>>        });
>> - - - - - - -
>>
>> So respondWith helper makes it easier for a show function respond to
>> different Content-Type request headers... i think... Since there's a
>> test for it, I guess content-type handling in the server-side JS is
>> something CouchDB intends to support moving forward...
>>
>
> Yep, they're features that CouchDB is comitted to keeping.
>
>
> Paul Davis
>
>> -Sam
>>
>>
>> On Tue, Apr 21, 2009 at 12:57 PM, Paul Davis
>> <paul.joseph.davis@gmail.com> wrote:
>>> Sam,
>>>
>>> This sounds very much like you want a _show function. Both _show and
>>> _list can specify the content-type returned to the client. You'll want
>>> to check the test suite code and look for the respondWith stuff for
>>> examples.
>>>
>>> HTH,
>>> Paul Davis
>>>
>>> On Tue, Apr 21, 2009 at 3:51 PM, Samuel Wan <sam@samuelwan.com> wrote:
>>>> I'm trying to build a simple learning experiment where I can write
>>>> HTML and Javascript into documents, and retrieve them with a GET
>>>> request. However, I don't know how to specify text/html or
>>>> application/x-javascript as the Content-Type headers in the response
>>>> to a document request.
>>>>
>>>> Is the recommended practice to simply store the html or js text as
>>>> attachments, or is it possible somehow to use a "show" function to
>>>> send them back with specific content type headers? I read some of
>>>> Chris Anderson's posts, the Safari Rough Cuts book, and looked a bit
>>>> at the CouchApp code, but it might be too much to grasp all at once
>>>> for me.
>>>>
>>>> -Sam
>>>>
>>>> On Tue, Apr 21, 2009 at 12:33 PM, Paul Davis
>>>> <paul.joseph.davis@gmail.com> wrote:
>>>>> Sam,
>>>>>
>>>>> We're consistently inconsistent in that we only sometimes check for
>>>>> the content-type when posting JSON documents. Of the top of my head I
>>>>> know we check in _temp_views but not for PUTs and POSTs to docs or
>>>>> _bulk_docs.
>>>>>
>>>>> If you mean for adding attachments to docs though CouchDB will just
>>>>> send you back the content-type header you attached it with so you can
>>>>> control what clients will see when fetching attachments.
>>>>>
>>>>> HTH,
>>>>> Paul Davis
>>>>>
>>>>> On Tue, Apr 21, 2009 at 3:28 PM, Samuel Wan <sam@samuelwan.com>
wrote:
>>>>>> Is it possible to specify the Content-Type header of a document?
Do
>>>>>> you need to use a "show" function?
>>>>>>
>>>>>> -Sam
>>>>>>
>>>>>
>>>>
>>>
>>
>

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