HttpPostCacheSynchronizer.java

...

if (mBaseUrl.getProtocol().equals("https"))
{
    UsernamePasswordCredentials credentials = 
        new UsernamePasswordCredentials(mAuthenticationUsername, 
                                        mAuthenticationPassword);

    mHttpClient.getState().setCredentials(AuthScope.ANY, credentials);

    mHttpClient.getParams().setAuthenticationPreemptive(true);
}

String composedUrl = mBaseUrl + "/" + relativePath;
PostMethod post = new PostMethod(composedUrl);
boolean success = false;

try
{
    //new StringPart("Accept", "application/json"), 
    Part[] parts = {new FilePart("sound", source)};
    post.setDoAuthentication(true);
    post.setRequestEntity(new MultipartRequestEntity(parts, post.getParams()));

    int status = mHttpClient.executeMethod(null, post, mHttpClient.getState());

    if (status == HttpURLConnection.HTTP_OK)
    {
        success = true;
    }
    else
    {
        throw new CacheException("Can't post content stream. 
                                   Error code: [" + status + "]");
    }
}
catch (Exception exception)
{
    throw new CacheException("Can't post content stream", exception);
}
finally
{
    post.releaseConnection();
}
return success;
...