diff --git a/demo/httpsig.py b/demo/httpsig.py
index 105ae99..5e3b22c 100644
--- a/demo/httpsig.py
+++ b/demo/httpsig.py
@@ -118,31 +118,32 @@ class HTTPXSigAuth(httpx.Auth):
         self.key = key
 
     def auth_flow(
-        self, r: httpx.Request
+        self,
+        request: httpx.Request
     ):
         bodydigest = None
-        if r.content:
+        if request.content:
             bh = hashlib.new("sha256")
-            bh.update(r.content)
+            bh.update(request.content)
             bodydigest = "SHA-256=" + base64.b64encode(bh.digest()).decode("utf-8")
 
         date = datetime.utcnow().strftime("%a, %d %b %Y %H:%M:%S GMT")
-        r.headers["Date"] = date
+        request.headers["Date"] = date
         sigheaders = {}
         if bodydigest:
-            r.headers["digest"] = bodydigest
+            request.headers["digest"] = bodydigest
             sigheaders = "(request-target) user-agent host date digest content-type"
         else:
             sigheaders = "(request-target) user-agent host date accept"
 
-        logger.warning(r.headers)
+        logger.warning(request.headers)
 
         sigdate = SignedData(
-            method = r.method,
-            path = r.url.path,
+            method = request.method,
+            path = request.url.path,
             signed_list = sigheaders.split(),
             body_digest = bodydigest,
-            headers = r.headers,
+            headers = request.headers,
         )
 
         to_be_signed = HttpSignature.build_signature_string(
@@ -162,5 +163,5 @@ class HTTPXSigAuth(httpx.Auth):
         sig_value = f'keyId="{key_id}",algorithm="rsa-sha256",\
             headers="{sigheaders}",signature="{sig.decode()}"'
         logger.debug(f"signed request {sig_value=}")
-        r.headers["signature"] = sig_value
-        yield r
+        request.headers["signature"] = sig_value
+        yield request