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// use actix_web::dev::{Service, ServiceRequest, ServiceResponse, Transform};
// use futures::future::{ok, Ready};
// use std::task::{Context, Poll};
// pub struct Language;
// impl<S, B> Transform<S, ServiceRequest> for Language
// where
// S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>,
// S::Future: 'static,
// {
// type Response = ServiceResponse<B>;
// type Error = actix_web::Error;
// type Transform = LanguageMiddleware<S>;
// type InitError = ();
// type Future = Ready<Result<Self::Transform, Self::InitError>>;
// fn new_transform(&self, service: S) -> Self::Future {
// ok(LanguageMiddleware { service })
// }
// }
// pub struct LanguageMiddleware<S> {
// service: S,
// }
// impl<S, B> Service<ServiceRequest> for LanguageMiddleware<S>
// where
// S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>,
// S::Future: 'static,
// {
// type Response = ServiceResponse<B>;
// type Error = actix_web::Error;
// type Future = S::Future;
// fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
// self.service.poll_ready(cx)
// }
// fn call(&self, mut req: ServiceRequest) -> Self::Future {
// if let Some(lang) = req.headers().get("Accept-Language") {
// if let Ok(lang_str) = lang.to_str() {
// req.extensions_mut().insert(lang_str.to_string());
// }
// }
// self.service.call(req)
// }
// }