fix: need Content-Type header in smoke test script

api/salience/timed_import.py

@@ -17,4 +17,5 @@ class timed_import:
 
     def __exit__(self, *args):
         elapsed = time.time() - self.start
-        print(f"in {elapsed:.1f}s")
+        sys.stdout.write(f"in {elapsed:.1f}s\n")
+        sys.stdout.flush()