CookieStore cleanup/fixes

* Remove TODO
* Remove Cookie::set_ setters
* Do not expose SameSite enum, provide getters on Cookie instead
* Simplify Response::cookies signature (now ignores errors)

src/async_impl/client.rs

@@ -546,7 +546,6 @@ impl Client {
                     .collect::<Vec<_>>()
                     .join("; ");
                 if !header.is_empty() {
-                    // TODO: is it safe to unwrap here? Investigate if Cookie content is always valid.
                     headers.insert(::header::COOKIE, HeaderValue::from_bytes(header.as_bytes()).unwrap());
                 }
             }

src/async_impl/response.rs

@@ -71,10 +71,11 @@ impl Response {
     }
 
     /// Retrieve the cookies contained in the response.
-    pub fn cookies<'a>(&'a self) -> impl Iterator<
-        Item = Result<cookie::Cookie<'a>, cookie::CookieParseError>
-    > + 'a {
+    /// 
+    /// Note that invalid 'Set-Cookie' headers will be ignored.
+    pub fn cookies<'a>(&'a self) -> impl Iterator<Item = cookie::Cookie<'a>> + 'a {
         cookie::extract_response_cookies(&self.headers)
+            .filter_map(Result::ok)
     }
 
     /// Get the final `Url` of this `Response`.