variable for domain name in redirect

[shiz]

Hello,

I have something in one of my server bloc:


```
  # switch to TLS for page.php, contact.php, faq.php, known https sources 
and /
  if ($scheme = http) {
    set $rule_9 1$rule_9;
  }
  if ($outdated = 0){
    set $rule_9 2$rule_9;
  }
  if ($request_uri ~
"^/(auction|biglemon|carview(-bike)?|carsensor(-c)?|daihatsu|gazoo|goo(bike(-catalog)?|net)|honda|koubai|kuriyama-truck|kurumaerabi(-search)?|truck-reparts(-b)?|truskey|list1|pdns|rakuten|page|faq|contact(_japan)?|jpa(-b|L1)?|_jpa[23])\.php|^/(\?.*)?$")
{
    set $rule_9 3$rule_9;
  }
  if ($rule_9 = "3210"){
    return 301 https://www.server.com$request_uri;
  }
```

Then something similar in another

```
  # switch to TLS for page.php, contact.php, faq.php, known https sources 
and /
  if ($scheme = http) {
    set $rule_9 1$rule_9;
  }
  if ($outdated = 0){
    set $rule_9 2$rule_9;
  }
  if ($request_uri ~
"^/(auction|biglemon|carview(-bike)?|carsensor(-c)?|daihatsu|gazoo|goo(bike(-catalog)?|net)|honda|koubai|kuriyama-truck|kurumaerabi(-search)?|truck-reparts(-b)?|truskey|list1|pdns|rakuten|page|faq|contact(_japan)?|jpa(-b|L1)?|_jpa[23])\.php|^/(\?.*)?$")
{
    set $rule_9 3$rule_9;
  }
  if ($rule_9 = "3210"){
    return 301 https://dev.server.com$request_uri;
  }
```

The problem is that have several servers.

1 - Is there a way to use variable for the some server names in the 'return
301' line so I could use shared code and not have to edit this snippet
everywhere another site turns https?

2 - I have a lot of those return 301 where code could be shared if something
like this were available e.g.
$scheme://$actual_real_server_name$request_uri

Difficulty,  the server_name can and often contains multiple entries.

I have found nothing useful about this on serverfault nor anywhere else. 
Dealing with this for several years.

Thanks!

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,280353,280353#msg-280353