CODEWITHSUNDEEP
nginx
Kevin Vincent
Kevin Vincent

Reputation: 617

if condition concatenation in nginx conf file

I'm trying to do this in a nginx conf file but it doesn't work :

if ($scheme://$host = 'http://example.com') {
  return 301 https://example.com$request_uri;
}

So how can I concatenate $scheme and $host in the if condition ?

Upvotes: 4

Views: 3954

Answers (2)

ᴍᴇʜᴏᴠ
ᴍᴇʜᴏᴠ

Reputation: 5266

I was also searching how to use Nginx's if with a concatenated string. I found this question, and a bunch of other articles saying "if is evil", but not offering a replacement.

And then I ran into this question, which led me to a solution that is much more compact and elegant - especially when you need multiple if cases, so I'll post it for other searchers.

map "$scheme://$host" $myVar {
    default 0;
    "http://example.com" 1;
    "~*(www\.)?example" 1;
    # add more if needed
}

Basically, this compares the first argument from the first line (the concatenated $scheme://$host) with first arguments from other lines (http://example.com literal, ~*(www\.)?example regex case insensitive, or default by default), and assigns the second arguments from corresponding lines (1 or 0 in our case, could be anything) to the variable passed as the second argument on the first line ($myVar).

Saving a lot of extra lines of code if you need 10+ ifs

Upvotes: 2

Larry.He
Larry.He

Reputation: 634

It's easy with a temp variable

set $tmp $scheme://$host;
if ($tmp = 'http://example.com') {
    return 301 https://example.com$request_uri;
}

Upvotes: 4

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