code: private void appendRequestParam(FastStringWriter actualUriBuf, Object name,
              Object value, String encoding) {
  
          if (value == null) {
              value = "";
          }
  
          actualUriBuf.append(urlEncode(name, encoding))
                      .append('=')
                      .append(urlEncode(value, encoding));
      }
docs: /*
  Appends a request parameters for the given aname and value