The content obtained by the browser is inconsistent with that obtained by curl.

  question

Returns a JSON string
But i used curl -l http:// ….
But they can’t get it.

Return

<HTML><HEAD><TITLE>404 Not Found</TITLE></HEAD>
 <BODY><H1>404 Not Found</H1>
 The requested URL /mauth/usr/exists was not found on this server.
 </BODY></HTML>

The problem was later found to be the network link problem. The host executing curl was isolated from the target server and could not access each other, testicular pain!