He just linked you to the exact code where it sets the header.
Basically if debug is higher then 0, any custom header will not work.

On Nov 12, 6:25 am, Alberto Dominguez
<[email protected]> wrote:
> Scott,
>
> Thanks, however keep in mind I've already implemented FirePHP (a
> plugin for the FF Firebug extension). It means, table is not being
> dumped to the page, but to the Firebug console. It works pretty well,
> but I'm not sure why (where) the content type is set to HTML.
>
> On Nov 11, 6:48 pm, Scott Dahl <[email protected]> wrote:
>
> > CakePHP dumps out a table of data when debug level is set to 2...this
> > obviously won't be valid JSON.  Not sure why the headers would change
> > though.
>
> > On Wed, Nov 11, 2009 at 1:38 PM, Alberto Dominguez 
> > <[email protected]> wrote:
> > > Hi,
>
> > > I'm using CakePHP to generate JSON responses. I'm also using FirePHP
> > > to debug and log the application execution. It works pretty well,
> > > however when I set the DEBUG level to 2 o higher -i.e. when I need to
> > > monitor the DB query executions- it suddenly changes the response
> > > header content type to HTML (Content-Type: text/html).
>
> > > I'm looking at several files, but I cannot find where it is being
> > > changed.
>
> > > Implementation Notes
>
> > > 1. My JSON implementation is really close to match the one presented
> > > at  http://www.pagebakers.nl/2007/06/05/using-json-in-cakephp-12/
> > > 2. CakePHP is successfully debugging and logging to FirePHP -even when
> > > I change the debug level from 1 to 2.
> > > 3. FireBug is the tool I use to monitor the HTTP communication
> > > 4. I'm setting the JSON content type at "RequestHandlerComponent"
> > > 5. I'm using JSONView extension at Firefox to validate the output
> > > (obviously it doesn't work when content type is set to text/html
>
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