diff --git a/mitmproxy2swagger/mitmproxy2swagger.py b/mitmproxy2swagger/mitmproxy2swagger.py
index 3f60136..f0bf08e 100644
--- a/mitmproxy2swagger/mitmproxy2swagger.py
+++ b/mitmproxy2swagger/mitmproxy2swagger.py
@@ -213,19 +213,22 @@ def main(override_args: Optional[Sequence[str]] = None):
             )
 
             params = swagger_util.url_to_params(url, path_template_to_set)
+            all_params = []
             if args.headers:
                 headers_request = swagger_util.request_to_headers(
                     req.get_request_headers()
                 )
                 if headers_request is not None and len(headers_request) > 0:
-                    set_key_if_not_exists(
-                        swagger["paths"][path_template_to_set][method],
-                        "parameters",
-                        headers_request,
-                    )
+                    all_params.extend(headers_request)
+
             if params is not None and len(params) > 0:
+                all_params.extend(params)
+
+            if len(all_params) > 0:
                 set_key_if_not_exists(
-                    swagger["paths"][path_template_to_set][method], "parameters", params
+                    swagger["paths"][path_template_to_set][method],
+                    "parameters",
+                    all_params,
                 )
 
             if method not in ["get", "head"]: