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If a location is defined by a prefix string that ends with the slash character, and requests are processed by one of proxy_pass, fastcgi_pass, uwsgi_pass, scgi_pass, memcached_pass, or grpc_pass, then the special processing is performed. In response to a request with URI equal to this string, but without the trailing slash, a permanent redirect with the code 301 will be returned to the requested URI with the slash appended. If this is not desired, an exact match of the URI and location could be defined like this:

中的

In response to a request with URI equal to this string, but without the trailing slash, a permanent redirect with the code 301 will be returned to the requested URI with the slash appended.

这一段到底说了什么？能否举一个例子说明一下？

after decoding the text encoded in the “%XX” form

所谓 “%XX” form 是一种什么形式?

and possible compression of two or more adjacent slashes into a single slash.

为什么会出现几个'/'相邻的情况？（如果这种情况是错误的话，nginx应该不会说会对它进行处理）

The “@” prefix defines a named location. Such a location is not used for a regular request processing, but instead used for request redirection. They cannot be nested, and cannot contain nested locations.

什么叫做不会被用来做正常的请求处理，但会用来请求重定向？也就是说这个location块中不能使用root之类的东西，必须使用proxy_pass之类的？

另外这个@前缀，前在什么地方？location @ ...吗？

谢谢