handle server CloseNotifying connection

tests/https-agent.rs

@@ -0,0 +1,11 @@
+use std::io::Read;
+
+#[test]
+fn connection_close() {
+    let agent = ureq::Agent::default().build();
+    let resp = agent.get("https://example.com/404")
+        .set("Connection", "close")
+        .call();
+    assert_eq!(resp.status(), 404);
+    resp.into_reader().read_to_end(&mut vec![]).unwrap();
+}