Best content type to serve JSONP?

I have a webservice that when called without specifying a callback will return a JSON string using application/json as the content type.

When a callback is specified it will wrap the JSON string in a callback function, so it's not really valid JSON anymore. My question is, should I serve it as application/javascript in this case or still use application/json?

Answers:

Answer

Use application/javascript. In that way, clients can rely on the content-type without having to manually check whether a response has padding or not.

Answer

Use application/json as per rfc4627.txt if what you return is plain JSON.

If you return JavaScript (which is really what JSONP is), then use application/javascript as per rfc4329.txt

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