set_header/set_status/set_content chaining

[vitaly-castLabs]

Preface

I often find myself writing code similar to this:

server.Post("/add", [](const httplib::Request& req, httplib::Response& res) {
    res.set_header("Access-Control-Allow-Origin", "*");
    res.set_status(201);
    res.set_content("...", "...");
});

It's ok, but we can do better if those setters returned *this (especially if it's not res but a longer name). This widely used pattern is known as method chaining:

    res.set_header("Access-Control-Allow-Origin", "*").set_status(201).set_content("...", "...");

Looks neater (imo) and only requires adding return *this;

Will you be interested in merging a PR adding this feature? Here's an example:
vitaly-castLabs@6ad63ea

[yhirose]

@vitaly-castLabs sorry for the late reply. Please go ahead to send the pull request, and be sure to include a unit test for the changes. Also could you please to the same to Request::set_header? Thanks a lot!