code: @Override
      public void setQueryString(NameValuePair[] params) {
          LOG.trace("enter HttpMethodBase.setQueryString(NameValuePair[])");
          queryString = EncodingUtil.formUrlEncode(params, "UTF-8");
      }
docs: Sets the query string of this HTTP method.  The pairs are encoded as UTF-8 characters.
  To use a different charset the parameters can be encoded manually using EncodingUtil
  and set as a single String.
  
  @param params an array of {@link NameValuePair}s to add as query string
  parameters. The name/value pairs will be automcatically
  URL encoded
  
  @see EncodingUtil#formUrlEncode(NameValuePair[], String)
  @see #setQueryString(String)