feat(http): add cookie for client

Author: StellarisW

volo-http/src/utils/cookie/store.rs

@@ -45,6 +45,10 @@ impl CookieStore {
             size += key.len() + value.len() + 3;
         }
 
+        if size == 0 {
+            return None;
+        }
+
         let mut s = String::with_capacity(size);
 
         for (name, value) in cookie_iter {
@@ -54,10 +58,6 @@ impl CookieStore {
             s.push_str("; ");
         }
 
-        if s.is_empty() {
-            return None;
-        }
-
         HeaderValue::from_maybe_shared(Bytes::from(s)).ok()
     }
 }