Ask for nginx address rewriting rules

request
http://xxx/sites/app/index.php?m=user&c=index&a=avatar&user_id=0F0993200F910338F0EE638EFDFA1779

when matching the address
http://xxx/sites/app/avatar/0F0993200F910338F0EE638EFDFA1779

the following doesn"t seem to work

location /sites/app/avatar/  {
   rewrite "^/sites/app/avatar/$"  $host/sites/app/index.php?m=user&c=index&a=avatar&user_id=$1;
}
Mar.28,2021

location /sites/app/avatar/  {
   rewrite /sites/app/avatar/(.*)  /sites/app/index.php?m=user&c=index&a=avatar&user_id=$1 last;
}

rewrite ^ / sites/app/avatar/ (. *) $/ sites/app?m=user&c=index&a=avatar&user_id=$1 last;

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