code: protected void consumeChar(ImapRequestLineReader request, char expected)
              throws ProtocolException {
          char consumed = request.consume();
          if (consumed != expected) {
              throw new ProtocolException("Expected:'" + expected + "' found:'" + consumed + '\'');
          }
      }
docs: Consumes the next character in the request, checking that it matches the
  expected one. This method should be used when the