fix(http1): make date_header effective (hyperium#3718)

Before this patch, the option was not fully propagated to the inner server conn state object. Now it is.

src/proto/h1/conn.rs

@@ -152,6 +152,11 @@ where
         self.state.allow_half_close = true;
     }
 
+    #[cfg(feature = "server")]
+    pub(crate) fn disable_date_header(&mut self) {
+        self.state.date_header = false;
+    }
+
     pub(crate) fn into_inner(self) -> (I, Bytes) {
         self.io.into_inner()
     }

src/server/conn/http1.rs

@@ -459,6 +459,9 @@ impl Builder {
         if let Some(max) = self.max_buf_size {
             conn.set_max_buf_size(max);
         }
+        if !self.date_header {
+            conn.disable_date_header();
+        }
         let sd = proto::h1::dispatch::Server::new(service);
         let proto = proto::h1::Dispatcher::new(sd, conn);
         Connection { conn: proto }