在Nginx中配置proxy_pass时，需要注意斜杠的问题。
如官方文档所述：
If the proxy_pass directive is specified with a URI, then when a request is passed to the server, the part of a normalized request URI matching the location is replaced by a URI specified in the directive:
location /name/ {
proxy_pass http://127.0.0.1/remote/;
}If proxy_pass is specified without a URI, the request URI is passed to the server in the same form as sent by a client when the original request is processed, or the full normalized request URI is passed when processing the changed URI:
location /some/path/ {
proxy_pass http://127.0.0.1;
}Before version 1.1.12, if proxy_pass is specified without a URI, the original request URI might be passed instead of the changed URI in some cases.
当proxy_pass后指定的是带斜杠的链接（其实就是URI，上例是一般情况，特别情况是http://127.0.0.1/ ）时，请求的链接会被替换。如上例中，若请求的路由为/name/xxx，则下一站实际收到的请求路由为/remote/xxx；
当proxy_pass后指定的是不带斜杠的格式（即非URI），则不做任何替换，直接将原请求路由转发至下一站；
