chenyuezhou opened a new issue #3753:
URL: https://github.com/apache/apisix/issues/3753
### Issue description
Dose proxy-mirror support set mirror rate?
### Environment
* apisix version: `2.3`
* OS: `5.4.80`
* OpenResty / Nginx version:
```
nginx version: openresty/1.19.3.1
built by gcc 8.3.1 20191121 (Red Hat 8.3.1-5) (GCC)
built with OpenSSL 1.1.1g FIPS 21 Apr 2020
TLS SNI support enabled
configure arguments:
--prefix=/home/zcy/openresty/openresty-1.19.3.1/nginx/nginx --with-cc-opt=-O2
--add-module=../ngx_devel_kit-0.3.1 --add-module=../echo-nginx-module-0.62
--add-module=../xss-nginx-module-0.06 --add-module=../ngx_coolkit-0.2
--add-module=../set-misc-nginx-module-0.32
--add-module=../form-input-nginx-module-0.12
--add-module=../encrypted-session-nginx-module-0.08
--add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.19
--add-module=../ngx_lua_upstream-0.07
--add-module=../headers-more-nginx-module-0.33
--add-module=../array-var-nginx-module-0.05
--add-module=../memc-nginx-module-0.19 --add-module=../redis2-nginx-module-0.15
--add-module=../redis-nginx-module-0.3.7
--add-module=../rds-json-nginx-module-0.15
--add-module=../rds-csv-nginx-module-0.09 --add-module=../ngx_stream_lua-0.0.9
--with-ld-opt='-Wl,-rpath,/home/zcy/openresty/openresty-1.19.3.1/nginx/luajit/lib
-Wl,-rpath,/home/zcy/openresty/openresty-1.19.3.1/nginx/luajit/lib'
--with-pcre=/ho
me/zcy/openresty/openresty-1.19.3.1/bundle/pcre-8.40 --with-stream
--with-stream_ssl_module --with-stream_ssl_preread_module
--with-http_ssl_module --with-http_stub_status_module --with-http_realip_module
--with-http_v2_module --with-pcre-jit --with-pcre-opt=-g --with-stream
```
* etcd version:
```
{"hostname":"localhost.localdomain","version":"2.3","id":"8842cd73-9d27-4745-8005-20d8e4383c29","etcd_version":"3.5.0","up_time":7566,"last_report_time":1614841246,"boot_time":1614833686}
```
* apisix-dashboard: nope
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