ServiceStack.HttpRequestExtensions.GetResponseContentType C# (CSharp) Метод

        public static string GetResponseContentType(this IRequest httpReq)
        {
            var specifiedContentType = GetQueryStringContentType(httpReq);
            if (!IsNullOrEmpty(specifiedContentType)) return specifiedContentType;

            var acceptContentTypes = httpReq.AcceptTypes;
            var defaultContentType = httpReq.ContentType;
            if (httpReq.HasAnyOfContentTypes(MimeTypes.FormUrlEncoded, MimeTypes.MultiPartFormData))
            {
                defaultContentType = HostContext.Config.DefaultContentType;
            }

            var customContentTypes = HostContext.ContentTypes.ContentTypeFormats.Values;
            var preferredContentTypes = HostContext.Config.PreferredContentTypesArray;

            var acceptsAnything = false;
            var hasDefaultContentType = !IsNullOrEmpty(defaultContentType);
            if (acceptContentTypes != null)
            {
                var hasPreferredContentTypes = new bool[preferredContentTypes.Length];
                foreach (var acceptsType in acceptContentTypes)
                {
                    var contentType = ContentFormat.GetRealContentType(acceptsType);
                    acceptsAnything = acceptsAnything || contentType == "*/*";

                    for (var i = 0; i < preferredContentTypes.Length; i++)
                    {
                        if (hasPreferredContentTypes[i]) continue;
                        var preferredContentType = preferredContentTypes[i];
                        hasPreferredContentTypes[i] = contentType.StartsWith(preferredContentType);

                        //Prefer Request.ContentType if it is also a preferredContentType
                        if (hasPreferredContentTypes[i] && preferredContentType == defaultContentType)
                            return preferredContentType;
                    }
                }

                for (var i = 0; i < preferredContentTypes.Length; i++)
                {
                    if (hasPreferredContentTypes[i]) return preferredContentTypes[i];
                }

                if (acceptsAnything)
                {
                    if (hasDefaultContentType)
                        return defaultContentType;
                    if (HostContext.Config.DefaultContentType != null)
                        return HostContext.Config.DefaultContentType;
                }

                foreach (var contentType in acceptContentTypes)
                {
                    foreach (var customContentType in customContentTypes)
                    {
                        if (contentType.StartsWith(customContentType, StringComparison.OrdinalIgnoreCase))
                            return customContentType;
                    }
                }
            }

            if (httpReq.ContentType.MatchesContentType(MimeTypes.Soap12))
            {
                return MimeTypes.Soap12;
            }

            if (acceptContentTypes == null && httpReq.ContentType == MimeTypes.Soap11)
            {
                return MimeTypes.Soap11;
            }

            //We could also send a '406 Not Acceptable', but this is allowed also
            return HostContext.Config.DefaultContentType;
        }