Implements an OpenSearch request over HTTP
상속: OpenSearchRequest
        /// <summary>
        /// Create an OpenSearchRequest based on the IOpenSearchable entity, type and parameters.
        /// </summary>
        /// <description>
        /// This method is the basic default implementation for creating OpenSearchRequest. It supports only 2 schemes:
        /// 1) file:// that will create a FileOpenSearchRequest
        /// 2) http:// that will create an HttpOpenSearchRequest
        /// <param name="entity">IOpenSearchable Entity.</param>
        /// <param name="type">MimeType of the request.</param>
        /// <param name="parameters">Parameters of the request.</param>
        public static OpenSearchRequest Create(IOpenSearchable entity, QuerySettings querySettings, NameValueCollection parameters)
        {
            OpenSearchDescription osd = entity.GetOpenSearchDescription();

            OpenSearchDescriptionUrl url = OpenSearchFactory.GetOpenSearchUrlByType(osd, querySettings.PreferredContentType);

            if (url == null) throw new InvalidOperationException(string.Format("Could not find a URL template for entity {0} with type {1}", entity.Identifier, querySettings.PreferredContentType));

            OpenSearchUrl queryUrl = OpenSearchFactory.BuildRequestUrlForTemplate(url, parameters, entity.GetOpenSearchParameters(querySettings.PreferredContentType), querySettings);

            OpenSearchRequest request = null;

            switch (queryUrl.Scheme) {
                case "http":
                case "https":
                    request = new HttpOpenSearchRequest(queryUrl, querySettings.PreferredContentType);
                    ((HttpOpenSearchRequest)request).TimeOut = 60000;
                    break;
                case "file":
                    request = new FileOpenSearchRequest(queryUrl, querySettings.PreferredContentType);
                    break;
            }

            request.OriginalParameters = parameters;

            return request;
        }
        public static OpenSearchRequest Create(OpenSearchUrl queryUrl)
        {
            OpenSearchRequest request = null;

            switch (queryUrl.Scheme) {
                case "http":
                case "https":
                    request = new HttpOpenSearchRequest(queryUrl);
                    break;
                case "file":
                    request = new FileOpenSearchRequest(queryUrl, "");
                    break;
            }

            return request;
        }