Set Date and Server headers at beginning

src/http/mod.rs

@@ -181,11 +181,20 @@ impl Request {
 
 impl Response {
     pub fn new() -> Response {
-        Response {
+        let mut res = Response {
             version: "1.1".to_string(),
             status: Status::from_code(200).unwrap(),
             header_fields: Vec::new(),
-        }
+        };
+        res.add_header("Server", "Locutus");
+        res.add_header(
+            "Date",
+            chrono::Utc::now()
+                .format("%a, %d %b %Y %H:%M:%S GMT")
+                .to_string()
+                .as_str(),
+        );
+        res
     }
 
     pub fn status(&mut self, status_code: u16) {
@@ -217,15 +226,6 @@ impl Response {
     }
 
     pub fn send(&mut self, stream: &mut Stream) -> Result<(), std::io::Error> {
-        self.add_header("Server", "Locutus");
-        self.add_header(
-            "Date",
-            chrono::Utc::now()
-                .format("%a, %d %b %Y %H:%M:%S GMT")
-                .to_string()
-                .as_str(),
-        );
-
         let mut buf = None;
         if let None = self.find_header("Content-Length") {
             let new_buf = self.format_default_response();