sdk/src/com/socialize/oauth/signpost/AbstractOAuthConsumer.java
protected void collectBodyParameters(HttpRequest request, HttpParameters out)
            throws IOException {

        // collect x-www-form-urlencoded body params
        String contentType = request.getContentType();
        if (contentType != null && contentType.startsWith(OAuth.FORM_ENCODED)) {
            InputStream payload = request.getMessagePayload();
            out.putAll(OAuth.decodeForm(payload), true);
        }
    }
protected void collectBodyParameters(HttpRequest request, HttpParameters out)
            throws IOException {

        // collect x-www-form-urlencoded body params
        String contentType = request.getContentType();
        if (contentType != null && contentType.startsWith(OAuth.FORM_ENCODED)) {
            InputStream payload = request.getMessagePayload();
            out.putAll(OAuth.decodeForm(payload), true);
        }
    }
Collects x-www-form-urlencoded body parameters as per OAuth Core 1.0 spec
section 9.1.1