code: public static String getRequestHeadersOutput(HTTP http) {
          if (http == null) {
              return "";
          }
          StringBuilder requestHeaders = new StringBuilder();
          String uuid = getUUID();
          requestHeaders.append(ONCLICK_TOGGLE).append(uuid).append("\")'>Toggle Headers</a> ");
          requestHeaders.append(SPAN_ID).append(uuid).append(DISPLAY_NONE);
          requestHeaders.append(formatKeyPair(http.getHeaders()));
          requestHeaders.append(END_SPAN);
          return requestHeaders.toString();
      }
docs: Takes the headers set in the HTTP request, and writes them to the output
  file, in properly HTML formatted fashion
  
  @param http - the http object that is making the call
  @return String: an HTML formatted string with headers