fix(client): handle when DNS resolves after a timeout triggers

Closes #848

src/client/connect.rs

@@ -16,7 +16,7 @@ pub trait Connect {
     /// Type of Transport to create
     type Output: Transport;
     /// The key used to determine if an existing socket can be used.
-    type Key: Eq + Hash + Clone;
+    type Key: Eq + Hash + Clone + fmt::Debug;
     /// Returns the key based off the Url.
     fn key(&self, &Url) -> Option<Self::Key>;
     /// Connect to a remote address.
@@ -96,10 +96,12 @@ impl Connect for HttpConnector {
     }
 
     fn connected(&mut self) -> Option<(Self::Key, io::Result<HttpStream>)> {
-        let (host, addr) = match self.dns.as_ref().expect("dns workers lost").resolved() {
+        let (host, addrs) = match self.dns.as_ref().expect("dns workers lost").resolved() {
             Ok(res) => res,
             Err(_) => return None
         };
+        //TODO: try all addrs
+        let addr = addrs.and_then(|mut addrs| Ok(addrs.next().unwrap()));
         debug!("Http::resolved <- ({:?}, {:?})", host, addr);
         if let Entry::Occupied(mut entry) = self.resolving.entry(host) {
             let resolved = entry.get_mut().remove(0);