The result of ngxin reverse proxy an interface returns that of interface b?

background in test environment A server, background pre-release in B server, front-end server in C
configure nginx reverse proxy interface in front-end C server,
has nothing to do with backend service?
proxy to test environment An is normal, changed to pre-published B result or visited A service! nginx must have restarted why?

        location /api {
         proxy_pass  https://xx.xx.com/api;
            proxy_set_header Cookie $http_cookie;
            proxy_cookie_domain xx.com localhost;
            proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
            proxy_set_header Host xx.com;
            proxy_set_header X-Real-IP $remote_addr;
            proxy_set_header REMOTE-HOST $remote_addr;
        }
Nov.22,2021

proxy_pass address is not matched correctly.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b3a66f-41250.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b3a66f-41250.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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