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Constraints of NGINX if block

If is EVIL

• Orginal article why NGINX has these constraints. As they mention:

The only 100% safe things which may be done inside if in a location context are:

return …; rewrite … last;

and set variables value - like set $allow "${allow}n";

Other constraints

• No if inside if.
• Allowed in specific scopes server, location.

No multiple operators

• No OR, no AND, nothing.
• Workaround

Why should you need to use if even if it is considered evil?

• Because of other NGINX constraints like ones for
• location or
• redirect.