How to set Content Type on HttpURLConnection?

If you really want to use the HttpURLConnection you can use the setRequestProperty method like:

myHttpURLConnection.setRequestProperty("Content-Type", "text/plain; charset=utf-8");
myHttpURLConnection.setRequestProperty("Expect", "100-continue");

However, if I were you I'd look into using the Apache HTTP libraries. They're a little higher-level and easier to use. With them you would do it with something like:

HttpGet get = new HttpGet("http://192.168.1.36/");
get.setHeader("Content-Type", "text/plain; charset=utf-8");
get.setHeader("Expect", "100-continue");

HttpResponse resp = null;
try {
    HttpClient httpClient = new DefaultHttpClient();
    resp = httpClient.execute(get);
} catch (ClientProtocolException e) {
    Log.e(getClass().getSimpleName(), "HTTP protocol error", e);
} catch (IOException e) {
    Log.e(getClass().getSimpleName(), "Communication error", e);
}
if (resp != null) {
    // got a response, do something with it
} else {
    // there was a problem
}

connection.setRequestProperty("Content-Type", "VALUE");