code: private void parseTrailerHeaders() throws IOException {
          try {
              this.footers = AbstractMessageParser.parseHeaders(in,
                      constraints.getMaxHeaderCount(),
                      constraints.getMaxLineLength(),
                      null);
          } catch (final HttpException ex) {
              final IOException ioe = new MalformedChunkCodingException("Invalid footer: "
                      + ex.getMessage());
              ioe.initCause(ex);
              throw ioe;
          }
      }
docs: Reads and stores the Trailer headers.
  @throws IOException in case of an I/O error