code: private void addHeadersToContext(final HttpHeaders headers) {
          for (HttpHeader header : headers.all()) {
              final String rawKey = header.key();
              final String transformedKey = rawKey.replaceAll("-", "");
              context.put("requestHeader".concat(transformedKey), header.values()
                      .toString());
          }
      }
docs: Adds the request header information to the Velocity context.
  
  @param headers the request headers