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I am designing a web application for iPad which makes use of HTML5 in mobile safari. I am transmitting the file manually through an ASP.NET .ashx file hosted on IIS 7 running .NET Framework v2.0. The essential code looks partly like this: // If we receive range header only transmit partial file if (context.Request.Headers["Range"] != null) { var fi = new FileInfo(filePath); long fileSize = fi.Length; // Read start/end index string headerRange = context.Request.Headers["Range"].Replace("bytes=", ""); string[] range = headerRange.Split('-'); int startIndex = Convert.ToInt32(range[0]); int endIndex = Convert.ToInt32(range[1]); // Add header Content-Range,Last-Modified context.Response.StatusCode = (int)HttpStatusCode.PartialContent; context.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderContentRange), String.Format("bytes {0}-{1}/{2}", startIndex, endIndex, fileSize)); context.Response.AddHeader(HttpWorkerRequest.GetKnownResponseHeaderName(HttpWorkerRequest.HeaderLastModified), String.Format("{0:r}", fi.CreationTime)); long length = (endIndex - startIndex) + 1; context.Response.TransmitFile(filePath, startIndex, length); } else context.Response.TransmitFile(filePath); Now what confuses me to no end is the the protocols for requesting that safari seems to use. From proxying the requests through fiddler i get the following for an aprox 2MB file. NOTE: When requesting an mp4 file, directly served through IIS 7, the protocol and amount of request are the same First it requests 2 bytes which allows it to read the 'Content-Range' header. Now it request the entire content (?) - It proceeds to do step 1. & 2. again (??) - It now requests only parts of the file (???)

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