Add Response::content_type() method.

lib/src/request/request.rs

@@ -310,10 +310,10 @@ impl<'r> Request<'r> {
         self.extra.session = RefCell::new(jar);
     }
 
-    /// Returns `Some` of the Content-Type header of `self`. If the header is
-    /// not present, returns `None`. The Content-Type header is cached after the
-    /// first call to this function. As a result, subsequent calls will always
-    /// return the same value.
+    /// Returns the Content-Type header of `self`. If the header is not present,
+    /// returns `None`. The Content-Type header is cached after the first call
+    /// to this function. As a result, subsequent calls will always return the
+    /// same value.
     ///
     /// # Example
     ///

lib/src/response/response.rs

@@ -1,9 +1,8 @@
 use std::{io, fmt, str};
 use std::borrow::Cow;
 
-use http::{Header, HeaderMap};
 use response::Responder;
-use http::Status;
+use http::{Header, HeaderMap, Status, ContentType};
 
 /// The default size, in bytes, of a chunk for streamed responses.
 pub const DEFAULT_CHUNK_SIZE: u64 = 4096;
@@ -641,6 +640,24 @@ impl<'r> Response<'r> {
         self.status = Some(status);
     }
 
+    /// Returns the Content-Type header of `self`. If the header is not present
+    /// or is malformed, returns `None`.
+    ///
+    /// # Example
+    ///
+    /// ```rust
+    /// use rocket::Response;
+    /// use rocket::http::ContentType;
+    ///
+    /// let mut response = Response::new();
+    /// response.set_header(ContentType::HTML);
+    /// assert_eq!(response.content_type(), Some(ContentType::HTML));
+    /// ```
+    #[inline(always)]
+    pub fn content_type(&self) -> Option<ContentType> {
+        self.headers().get_one("Content-Type").and_then(|v| v.parse().ok())
+    }
+
     /// Sets the status of `self` to a custom `status` with status code `code`
     /// and reason phrase `reason`. This method should be used sparingly; prefer
     /// to use [set_status](#method.set_status) instead.