Update Headers Example

Source

#include <iostream>

#include <polycpp/vary/vary.hpp>

int main() {
    polycpp::http::Headers headers;
    polycpp::vary::vary(headers, polycpp::vary::FieldList{"Origin", "User-Agent"});
    std::cout << headers.get("Vary").value_or("") << '\n';
    return 0;
}

Output

Origin, User-Agent