Gary-Airwallex opened a new issue #4197:
URL: https://github.com/apache/apisix/issues/4197
### Issue description
APISIX supports rewriting of Host header while talking to the upstream
nodes, either with the proxy-rewrite plugin or with "pass_host" and
"upstream_host" attributes in Upstream configuration. However, they both
rewrite host for the Upstream, not nodes - so for example if I have an upstream
with nodes:
```
"nodes": {
"host-1.com:80": 1,
"host-2.com:443": 1
},
```
I can't set Host to "host-1.com" when the first node is picked by the
balancer, and set Host to "host-2.com" when the second is picked. I have tried
ngx.req.set_header() or set the upstream_host variable in balancer phase
directly and they don't seem to work. Is it a constraint by nginx modules /
openresty?
### Environment
* apisix version (cmd: `apisix version`): 2.5
* OS (cmd: `uname -a`): Ubuntu 18.04
* OpenResty / Nginx version (cmd: `nginx -V` or `openresty -V`): 1.19.3.1
* etcd version, if have (cmd: run `curl
http://127.0.0.1:9090/v1/server_info` to get the info from server-info API):
* apisix-dashboard version, if have:
* luarocks version, if the issue is about installation (cmd: `luarocks
--version`):
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