Method _header

lib/response.js:152–184

(key, value, options = {})

    }

    _header(key, value, options = {}) {

        const append = options.append ?? false;
        const separator = options.separator || ',';
        const override = options.override !== false;
        const duplicate = options.duplicate !== false;

        if (!append && override ||
            !this.headers[key]) {

            this.headers[key] = value;
        }
        else if (override) {
            if (key === 'set-cookie') {
                this.headers[key] = [].concat(this.headers[key], value);
            }
            else {
                const existing = this.headers[key];
                if (!duplicate) {
                    const values = existing.split(separator);
                    for (const v of values) {
                        if (v === value) {
                            return this;
                        }
                    }
                }

                this.headers[key] = existing + separator + value;
            }
        }

        return this;
    }

    vary(value) {