ShiningRush edited a comment on issue #1508:
URL:
https://github.com/apache/incubator-apisix/issues/1508#issuecomment-619560681
The key code is as below
```lua
...
for _, name in ipairs(upstream_names) do
if conf[name] then
ctx.var[upstream_vars[name]] = conf[name]
end
end
...
```
If you want your host parameter setting to nginx, you should place your code
snippet before it.
and why you commented the `host` of `upstream_vars `? I think you can
directly use it.
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