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copied!<p>I figured it out and got it working!</p> <p>While David's suggestions weren't the solution by themselves, he put me on the right track by telling me to use a packet sniffer (I ended up using Wireshark but that's not really the point).</p> <p>As it turns out, there were two errors in my dumbed down code. One so glaringly obvious that it makes me blush, one slightly more devious.</p> <p>First of all,</p> <pre><code>using (var streamWriter = new StreamWriter(stream)) { streamWriter.Write(Encoding.UTF8.GetBytes(requestText)); } </code></pre> <p>should of course be</p> <pre><code>using (var streamWriter = new StreamWriter(stream, Encoding.UTF8)) { streamWriter.Write(requestText); } </code></pre> <p>as streamWriter.Write does a ToString() on the parameter and Byte[].ToString() just returns "System.Byte[]". Embarassing!</p> <p>Secondly, the default UTF8 encoding adds the byte order mark \357\273\277, which also renders the content invalid as far as google is concerned. I found how to fix this problem <a href="https://stackoverflow.com/questions/1656717/c-sharp-httpwebrequest-posting-failing">here</a> on stackoverflow.</p> <p>So for anyone struggling with this, here is the final solution.</p> <pre><code>var url = string.Format ( "https://www.googleapis.com/calendar/v3/calendars?key={0}", application.Key ); var httpWebRequest = HttpWebRequest.Create(url) as HttpWebRequest; httpWebRequest.Headers["Authorization"] = string.Format("Bearer {0}", user.AccessToken.Token); httpWebRequest.Method = "POST"; // added the character set to the content-type as per David's suggestion httpWebRequest.ContentType = "application/json; charset=UTF-8"; httpWebRequest.CookieContainer = new CookieContainer(); // replaced Environment.Newline by CRLF as per David's suggestion var requestText = string.Join ( "\r\n", "{", " \"summary\": \"Test Calendar 123\"", "}" ); using (var stream = httpWebRequest.GetRequestStream()) // replaced Encoding.UTF8 by new UTF8Encoding(false) to avoid the byte order mark using (var streamWriter = new StreamWriter(stream, new UTF8Encoding(false))) { streamWriter.Write(requestText); } </code></pre> <p>Hope this helps someone!</p>

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