code: public void addFormField(String name, String value) {
          mWriter.append("--" + mBoundary).append(LINE_FEED);
          mWriter.append("Content-Disposition: form-data; name=\"" + name + "\"")
                  .append(LINE_FEED);
          mWriter.append("Content-Type: text/plain; charset=" + mCharset).append(
                  LINE_FEED);
          mWriter.append(LINE_FEED);
          mWriter.append(value).append(LINE_FEED);
          mWriter.flush();
      }
docs: Adds a form field to the request
  
  @param name  field name
  @param value field value