protected override void Push(IOwinRequest request, PushFunc pushPromise, string pushReference) { request.Set(CommonOwinKeys.AdditionalInfo, pushReference); // Copy the headers var headers = new HeaderDictionary( new Dictionary <string, string[]>(request.Headers, StringComparer.OrdinalIgnoreCase)); // Populate special HTTP2 headers headers[CommonHeaders.Method] = request.Method; // TODO: Not all methods are allowed for push. Don't push, or change to GET? headers[CommonHeaders.Scheme] = request.Scheme; headers.Remove("Host"); headers[CommonHeaders.Authority] = request.Headers["Host"]; headers[CommonHeaders.Path] = BingRequestProcessor.GetTileQuadFromSoapUrl(pushReference); headers.Remove(CommonHeaders.ContentLength); // Push promises cannot emulate requests with bodies. // TODO: What about cache headers? If-Match, If-None-Match, If-Modified-Since, If-Unmodified-Since. // If-Match & If-None-Match are multi-value so the client could send e-tags for the primary resource and referenced resources. // If-Modified-Since and If-Unmodified-Since are single value, so it may not make sense to apply them for secondary resources. pushPromise(headers); }