无法从Apache向Django webserver发出http请求

Question

I'm trying to issue a post request to my django webserver (which behaves correctly when accessed via browser)

my post code:

    HttpClient httpclient = new DefaultHttpClient();
    HttpPost httppost = new HttpPost("http://23.23.237.174/save-item");

    try {
        // Add your data
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(2);
        nameValuePairs.add(new BasicNameValuePair("user_email", WeShouldActivity.ACCOUNT_NAME));
        for (Field f : mData.keySet()) {
            nameValuePairs.add(new BasicNameValuePair(f.getName(), mData.get(f)));
        }
        httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));

        // Execute HTTP Post Request
        HttpResponse response = httpclient.execute(httppost);
        Log.v("GETREFERRALSSERVICE", "backing up items");

    } catch (ClientProtocolException e) {
        // TODO Auto-generated catch block
        Log.v("GETREFERRALSSERVICE", e.getMessage());
    } catch (IOException e) {
        // TODO Auto-generated catch block
        Log.v("GETREFERRALSSERVICE", e.getMessage());
    }

my complete error in apache2/access.log (nothing shows up in error.log)

174.253.199.12 - - [16/May/2012:03:25:15 +0000] "POST /save-item HTTP/1.1" 500 53055 "-" "Apache-HttpClient/UNAVAILABLE (java 1.4)"

Does anyone have any idea what this might be/how to fix?

NOTE: this IS an error. The request is not getting through to my view, where it does with the exact same url in a browser. I'm printing out the request first thing in my view and nothing shows up in error.log

Answer 1

'Apache-HttpClient/UNAVAILABLE (java 1.4)' is just the Android user agent string, not an error message. Something is wrong on the server side, you should try to debug it by adding logging, etc. Does the server side require authentication? If so, you might be missing a session cookie, etc.

BTW, since it seems you are adding more than two items, there is really no point in using new ArrayList<NameValuePair>(2) just use the default constructor.

Answer 2

Try this:

HttpClient client = new DefaultHttpClient();    
client.getParams().setBooleanParameter("http.protocol.expect-continue", false);    

This solved my problem.