add README for this feature
@@ -265,6 +265,7 @@ Configure frps same as above.
plugin_crt_path = ./server.crt
plugin_key_path = ./server.key
plugin_host_header_rewrite = 127.0.0.1
+ plugin_header_X-From-Where = frp
```
2. Visit `https://test.yourdomain.com`.
