Macro accept

macro_rules! accept {
    ($request:expr, $($mime:expr => $val:expr),+ $(,)*) => { ... };
}

Dispatches between blocks depending on the value of the Accept header.

This macro takes as first parameter the request object, and then each additional parameter must be of the form mime => value where mime is a MIME type in quotes and value is an expression of any type.

The macro returns the value corresponding to the MIME type that has the highest priority in the request’s Accept header. If multiple MIME types have the same priority, the earliest in the list passed to the macro is chosen. If no MIME matches the request, the first in the list is chosen. If there is no Accept header in the request, it is as if the header’s value was */*.

You can also use * in the MIME types you pass to the macro. The MIME */* can be used as a default handler.

Note: Using | just like in real match expressions is not yet supported because the author didn’t find a way to make it work with Rust macros.

Basic example

use rouille::Request;
use rouille::Response;

fn handle(request: &Request) -> Response {
    accept!(request,
        "text/html" => Response::html("<p>Hello world</p>"),
        "text/plain" => Response::text("Hello world"),
    )
}

Example with a default handler

use rouille::Request;
use rouille::Response;

fn handle(request: &Request) -> Response {
    accept!(request,
        "text/html" => Response::html("<p>Hello world</p>"),
        "text/plain" => Response::text("Hello world"),
        "*/*" => Response::empty_406()
    )
}