"if" inside "loop"

[marcopeg]

Hello, I'm trying to produce an upstream definition out of a list of possible values:

ENV FALLBACK "50.50.50.50;;51.51.5151;;52.52.52.52"
ENV SEPARATOR ";;"

Here is a working piece of template:

upstream fallback {
        {{ range $index, $value := split .Env.FALLBACK .Env.SEPARATOR }}
            server {{ $value }};
        {{end}}
    }

Which produces:

upstream fallback {
    server 50.50.50.50;
    server 51.51.5151;
    server 52.52.52.52;
}

But I would rather obtain this:

upstream fallback {
    server 50.50.50.50;
    server 51.51.5151 backup;
    server 52.52.52.52 backup;
}

I tried:

upstream fallback {
        {{ range $index, $value := split .Env.FALLBACK .Env.SEPARATOR }}
            {{ if eq $index 0 }}
              server {{ $value }};
            {{ else }}
              server {{ $value }} backup;
            {{ end }}
        {{end}}
    }

but I get parsing errors that I can't understand:

2019/06/19 14:44:13 unable to parse template: template: nginx.conf.tmpl:17: unexpected unrecognized character in action: U+00A0 in command

Any ideas?

[ianroberts]

U+00A0 is the non-breaking space character - check your template and replace all whitespace with real spaces.