allow overriding Content-Type in response

[bshanks]

How can I override Grape's choice of the Content-Type header in the response? (perhaps this should be added to the README). thanks

[dblock]

I haven't tried with content-type (it may be overwritten somewhere, in which case you'll need to do some work not to), but we append a last-modified header like this.

header("Last-Modified", ...)

The header method comes from endpoint.rb, hasn't been documented, but I don't see why not. It would be nice if someone (you?) wrote a test for this and content-type and added it to the doc.

# Set an individual header or retrieve
    # all headers that have been set.
    def header(key = nil, val = nil)
      if key
        val ? @header[key.to_s] = val : @header.delete(key.to_s)
      else
        @header
      end
    end

[mbleigh]

I actually ran into this myself recently...right now the Grape formatter may well override your Content-Type header without an easy way to get past it. I'll try to take a look at how to expose this functionality soon.

[dblock]

A related feature was committed in #125 that lets you add content types by extension. @bshanks - what's your scenario?

[dblock]

We've implemented this by mime-type. This remains a valid feature request to allow to override the content-type in the API implementation itself. For example you fetch /something.image and that can come back as image/jpeg or image/png depending on the mime type of the actual image.

[zeeshanlakhani]

Have there been any updates on this feature? I'm running into the problem of serving up both json and jsonp responses (if a callback is given). I want to keep the API default format as application/json, but would also like to be able to serve application/javascript for jsonp needs on API requests that contain params[:callback]. Any workarounds for this?

I'm using grape within a Rails 3.2.6 application.

[dblock]

I made a pull request, #202.

[dblock]

I think that maybe a cleaner solution for the JSONP problem, specifically, is to add a proper content-type for application/javascript and make all .js API responses be JSONP instead of relying on a callback parameter.

Otherwise, I believe the rack middleware described in #28 just does it.

[zeeshanlakhani]

Thank you. I agree with you on the cleaner solution. I'm using the middleware, but am presenting via Rabl templates. Rabl is looking for the format defined in my Grape setup. I'm guessing that using Grape/Rabl may be causing a bit of the problem as well.

[dblock]

#202 was merged, fyi

[zeeshanlakhani]

Thank you so much.