totemofwolf commented on issue #4095:
URL: https://github.com/apache/apisix/issues/4095#issuecomment-825365422


   > > > This command doesn't send Origin header.
   > > > The client should run the CORS mechanism: 
https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS
   > > 
   > > 
   > > Not yet.
   > > 
![WX20210422-155121](https://user-images.githubusercontent.com/1818214/115676983-a8eb4900-a382-11eb-8c4c-f08beb0f9969.png)
   > 
   > In the `curl` command, did you try to bring the `Origin` header? Example: 
`curl -I https://xxxyyy.com -H 'Origin: https://x'`
   
   If I set property `` in plugin: cors(), the response header will clear 
cors.....
   
   ```
     "plugins": {
       "cors": {
         "allow_origins": "https://www.xxx.cn";
       }
     }
   ```
   
   curl output: 
   ```
   HTTP/2 404
   content-type: text/plain; charset=utf-8
   content-length: 18
   date: Fri, 23 Apr 2021 03:37:33 GMT
   server: APISIX/2.5
   ```
   
   
   curl with -H 'Origin: ' returns ok:
   
   ```
   HTTP/2 404
   content-type: text/plain; charset=utf-8
   content-length: 18
   date: Fri, 23 Apr 2021 03:40:18 GMT
   server: APISIX/2.5
   access-control-allow-origin: https://www.xxx.cn
   vary: Origin
   access-control-allow-methods: *
   access-control-max-age: 5
   access-control-expose-headers: *
   access-control-allow-headers: *
   ```
   


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