diff --git a/stapler/handlers.py b/stapler/handlers.py
index 438260a..40456c4 100644
--- a/stapler/handlers.py
+++ b/stapler/handlers.py
@@ -126,6 +126,7 @@ class BaseHandler(abc.ABC, http.server.BaseHTTPRequestHandler):
         self.send_response(code, message)
         self.send_header("Content-Type", f"{content_type}; charset=UTF-8")
         self.send_header("Content-Length", str(len(encoded)))
+        self.send_header("Connection", "close")
         self.end_headers()
         self.wfile.write(encoded)
         self.close_connection = True
@@ -140,6 +141,7 @@ class BaseHandler(abc.ABC, http.server.BaseHTTPRequestHandler):
             headers = {}
         self.send_response(code, message)
         self.send_header("Content-Length", "0")
+        self.send_header("Connection", "close")
         for header, value in headers.items():
             self.send_header(header, value)
         self.end_headers()
@@ -188,9 +190,11 @@ class BaseHandler(abc.ABC, http.server.BaseHTTPRequestHandler):
                 "transfer-encoding",
                 "server",
                 "date",
+                "connection",
             ]:
                 self.send_header(header, value.replace(target_host, self.host))
         self.send_header("Content-Length", str(out_size := len(response.content)))
+        self.send_header("Connection", "close")
         self.end_headers()
         if out_size > 0:
             self.wfile.write(response.content)