If no handlers are found to handle the request, the server will return a 501 error.

如果没有找到处理请求的处理程序，服务器将返回一个501错误。

youdao

Always properly handle return values of functions returning references of dynamically allocated memory.

始终正确处理返回动态分配的内存引用的函数返回值。

youdao

It is therefore important that your code checks a return value is not an empty handle before continuing execution.

所以在继续执行前，在代码中检查返回值是否为一个空句柄是非常重要的。

youdao

"Houston,while you're looking that up, you might recognize what I have in my hand as the handle for the contingency sample return;

VOA: special.2011.05.15

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