On 10 Mar 2010, at 21:07, J Chris Anderson wrote:
>
> On Mar 10, 2010, at 7:47 PM, Robert Newson wrote:
>
>> All,
>>
>> I want to retrieve the JSON document or a specific binary attachment
>> of it from the same URL, conditional on the Accept header. That is,
>> "/db/doc" is either JSON metadata or a binary stream, depending on
>> content-type negotiation. The below rewrite enhancement would achieve
>> it, I think, but perhaps there's a cleaner way? Right now, I'm adding
>> another Erlang module to achieve this but I would really like to do it
>> entirely from a design document.
>>
>> I'm thinking of writing a new kind of rewrite handler. I have a case
>> where it would be very useful to rewrite a URL based on the contents
>> of a request header. That is, the presence of a particular header will
>> alter the path, but not otherwise;
>>
>> {
>> "_id":"_design/foo",
>> "rewrites": {
>> "bar": {
>> "function":"function(req){ if (req.headers["Accept"] == blah) {
>> return req.path + "extra";} return req.path"
>>
>> that is, the rewrite handler would get a full request object and
>> return the rewritten path, and could use anything from the request to
>> do so.
>>
>
> we originally decided against an executable rewrite handler for reasons of
> performance.
One could argue that optional executable rewrites are okay. Especially when
written as
Erlang functions.
> is there a way to add to the pattern matching api to achieve this?
"from": {
"path":"/db/:doc",
"headers":{"Accept":"application/octet-stream"}
},
"to":"/db/doc/attachment"
"from": {
"path":"/db/:doc",
"headers":{"Accept":"application/json"}
},
"to":"/db/doc"
Could do the trick, but I don't want to be the one implementing that :)
Cheers
Jan
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