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Is it possible to add custom headers to asp.net MVC 4 Web API?

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I assume you are talking about HTTP headers. And I am not sure if you want to customize the response or the request. You can do both. Here is a blog post that shows how to add a custom header in the response using and ActionFilterAttribute. If you are using JQuery ajax to send a request to the Web API you can use the beforeSend event to add a custom header. Here is an example of using it for basic authentication.

    $.ajax({
        url: _url,
        data: _data,
        type: _type,
        beforeSend: function (xhr) {
            var up = username + ":" + password;
            xhr.setRequestHeader("Authorization", "Basic " + up);
        },
        success: _successFunc,
        error: _errorFunc
    });
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thanks, i was talking about HTTP headers – user1135534 Oct 4 '12 at 0:14
brilliantly simple response - after a few hours going around in circles, this made my afternoon - especially the link detailing the "Same Origin Policy" and "Cross-Origin Resource Sharing" stuff I've been dancing around all day..., this response should be on 10x answers on SO... – dave -pointbypoint Dec 10 '12 at 15:38
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