I have a problem with Volley POST request on slow network. Everytime I see BasicNetwork.logSlowRequests in my LogCat, my POST request is executed twice or more
BasicNetwork.logSlowRequests
I managed to fix this by configuring HttpURLConnection like this:
connection.setChunkedStreamingMode(0);
I started a discussion about this in Volley email list (https://groups.google.com/forum/#!topic/volley-users/8PE9dBbD6iA).