Request and response filters

A recent addition to ServiceStack is the ability to register custom Request and Response filters. These should be registered in your AppHost.Configure() onload script:

• The Request Filters are applied before the service gets called and accepts: (IHttpRequest, IHttpResponse, RequestDto) e.g:

//Add a request filter to check if the user has a session initialized
this.RequestFilters.Add((httpReq, httpResp, requestDto) => {
    var sessionId = httpReq.GetCookieValue("user-session");
    if (sessionId == null)
    {
        httpResp.ReturnAuthRequired();
    }
});

• The Response Filters are applied after your service is called and accepts: (IHttpRequest, IHttpResponse, ResponseDto) e.g:

//Add a response filter to add a 'Content-Disposition' header so browsers treat it as a native .csv file
this.ResponseFilters.Add((req, res, dto) => {
    if (req.ResponseContentType == ContentType.Csv)
    {
        res.AddHeader(HttpHeaders.ContentDisposition,
            string.Format("attachment;filename={0}.csv", req.OperationName));
    }
});

Tip: If you're writing your own response to the response stream inside the response filter, add res.EndRequest(); to signal to ServiceStack not to do anymore processing for this request.