code: func (i ifCond) True(r *http.Request) bool {
  	if c, ok := ifConditions[i.op]; ok {
  		a, b := i.a, i.b
  		if r != nil {
  			replacer := NewReplacer(r, nil, "")
  			a = replacer.Replace(i.a)
  			b = replacer.Replace(i.b)
  		}
  		return c(a, b)
  	}
  	return false
  }
docs: // True returns true if the condition is true and false otherwise.
  // If r is not nil, it replaces placeholders before comparison.