Macro http_variable_set

macro_rules! http_variable_set {
    ( $name: ident, $handler: expr ) => { ... };
}

Define a static variable setter.

The set handler allows setting the property referenced by the variable. The set handler expects a Request, [mut ngx_variable_value_t], and a usize. Variables: https://nginx.org/en/docs/dev/development_guide.html#http_variables