public HttpServerHandler setBizThreadPool(ThreadPoolExecutor bizThreadPool) {
        this.bizThreadPool = bizThreadPool;
        return this;
    }
Check service exists

@param serviceName Service Name
@param methodName  Method name
@return if service and method exists, return true.
remoting/remoting-http/src/main/java/com/alipay/sofa/rpc/server/http/HttpServerHandler.java