code: public static boolean is100ContinueRequest(HttpCarbonMessage inboundRequestMsg) {
          return HEADER_VAL_100_CONTINUE.equalsIgnoreCase(
                  inboundRequestMsg.getHeader(HttpHeaderNames.EXPECT.toString()));
      }
docs: Check whether a particular request is expecting continue.
  @param inboundRequestMsg in question
  @return true if the request expects 100-continue response