From 5870db4815c1103161384924f4f1826986955b8b Mon Sep 17 00:00:00 2001
From: BroneKot <13498924+BroneKot@users.noreply.github.com>
Date: Fri, 22 Nov 2019 17:26:02 +0300
Subject: [PATCH 1/2] Adding the ability to change the compression level. By
 default, python gzip.GzipFile compresslevel is 9. This commit saves the
 behavior of the standard library, but allows you to override compresslevel.
 High values are not recommended for streaming compression.

---
 starlette/middleware/gzip.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/starlette/middleware/gzip.py b/starlette/middleware/gzip.py
index bb634e36d..091316534 100644
--- a/starlette/middleware/gzip.py
+++ b/starlette/middleware/gzip.py
@@ -6,29 +6,31 @@
 
 
 class GZipMiddleware:
-    def __init__(self, app: ASGIApp, minimum_size: int = 500) -> None:
+    def __init__(self, app: ASGIApp, minimum_size: int = 500, compresslevel: int = 9) -> None:
         self.app = app
         self.minimum_size = minimum_size
+        self.compresslevel = compresslevel
 
     async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         if scope["type"] == "http":
             headers = Headers(scope=scope)
             if "gzip" in headers.get("Accept-Encoding", ""):
-                responder = GZipResponder(self.app, self.minimum_size)
+                responder = GZipResponder(self.app, self.minimum_size, self.compresslevel)
                 await responder(scope, receive, send)
                 return
         await self.app(scope, receive, send)
 
 
 class GZipResponder:
-    def __init__(self, app: ASGIApp, minimum_size: int) -> None:
+    def __init__(self, app: ASGIApp, minimum_size: int, compresslevel: int) -> None:
         self.app = app
         self.minimum_size = minimum_size
+        self.compresslevel = compresslevel
         self.send = unattached_send  # type: Send
         self.initial_message = {}  # type: Message
         self.started = False
         self.gzip_buffer = io.BytesIO()
-        self.gzip_file = gzip.GzipFile(mode="wb", fileobj=self.gzip_buffer)
+        self.gzip_file = gzip.GzipFile(mode="wb", fileobj=self.gzip_buffer, compresslevel=self.compresslevel)
 
     async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         self.send = send

From 1128338132a3b7ff8428a3cf08752c592c2d635a Mon Sep 17 00:00:00 2001
From: BroneKot <13498924+BroneKot@users.noreply.github.com>
Date: Fri, 22 Nov 2019 21:43:40 +0300
Subject: [PATCH 2/2] lint

---
 starlette/middleware/gzip.py | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/starlette/middleware/gzip.py b/starlette/middleware/gzip.py
index 091316534..13ce92bbb 100644
--- a/starlette/middleware/gzip.py
+++ b/starlette/middleware/gzip.py
@@ -6,7 +6,9 @@
 
 
 class GZipMiddleware:
-    def __init__(self, app: ASGIApp, minimum_size: int = 500, compresslevel: int = 9) -> None:
+    def __init__(
+        self, app: ASGIApp, minimum_size: int = 500, compresslevel: int = 9
+    ) -> None:
         self.app = app
         self.minimum_size = minimum_size
         self.compresslevel = compresslevel
@@ -15,7 +17,9 @@ async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         if scope["type"] == "http":
             headers = Headers(scope=scope)
             if "gzip" in headers.get("Accept-Encoding", ""):
-                responder = GZipResponder(self.app, self.minimum_size, self.compresslevel)
+                responder = GZipResponder(
+                    self.app, self.minimum_size, self.compresslevel
+                )
                 await responder(scope, receive, send)
                 return
         await self.app(scope, receive, send)
@@ -30,7 +34,9 @@ def __init__(self, app: ASGIApp, minimum_size: int, compresslevel: int) -> None:
         self.initial_message = {}  # type: Message
         self.started = False
         self.gzip_buffer = io.BytesIO()
-        self.gzip_file = gzip.GzipFile(mode="wb", fileobj=self.gzip_buffer, compresslevel=self.compresslevel)
+        self.gzip_file = gzip.GzipFile(
+            mode="wb", fileobj=self.gzip_buffer, compresslevel=self.compresslevel
+        )
 
     async def __call__(self, scope: Scope, receive: Receive, send: Send) -> None:
         self.send = send