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https://issues.apache.org/jira/browse/COUCHDB-463?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12742463#action_12742463
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Robert Newson commented on COUCHDB-463:
---------------------------------------

I did;

"Some tools, like JSONView for FireFox, do not send the Accept header but do 
render "application/json" responses if received."

That is, there is at least one plugin that can render returned JSON better than 
text/plain that does not (or cannot? I don't know firefox plugin API) send the 
Accept header couchdb expects.

I've added force_json=true to couchdb-lucene as the API there is much smaller 
(you can query the index, that's about it) so I didn't have any qualms about 
adding another parameter for these rare cases. If this parameter lets users 
work around bugs or deficiencies in their browsers or tools, I'm fine with 
that. Obviously the Accept header is the way to go if you access couch 
programatically which is the typical case.

JSONView: https://addons.mozilla.org/en-US/firefox/addon/10869

> Allow client to insist on Content-Type: application/json in all responses
> -------------------------------------------------------------------------
>
>                 Key: COUCHDB-463
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-463
>             Project: CouchDB
>          Issue Type: Improvement
>            Reporter: Robert Newson
>
> The Content-Type of responses is negotiated via Accept (application/json if 
> acceptable, text/plain if not). When the client is the browser, this often 
> fails as the Accept line usually does not include application/json.
> Consider a query parameter to force application/json responses even without 
> the Accept header. Couchdb-lucene does this today (it didn't do it 
> yesterday), described as;
> "force_json
>     Usually couchdb-lucene determines the Content-Type of its response based 
> on the presence of the Accept header. If Accept contains "application/json", 
> you get "application/json" in the response, otherwise you get 
> "text/plain;charset=utf8". Some tools, like JSONView for FireFox, do not send 
> the Accept header but do render "application/json" responses if received. 
> Setting force_json=true forces all response to "application/json" regardless 
> of the Accept header."
> I recognize it duplicates the HTTP content negotiation.

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