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-rw-r--r--synapse/metrics/_exposition.py5
1 files changed, 4 insertions, 1 deletions
diff --git a/synapse/metrics/_exposition.py b/synapse/metrics/_exposition.py
index ab7f948ed4..4304c60d56 100644
--- a/synapse/metrics/_exposition.py
+++ b/synapse/metrics/_exposition.py
@@ -208,6 +208,7 @@ class MetricsHandler(BaseHTTPRequestHandler):
             raise
         self.send_response(200)
         self.send_header("Content-Type", CONTENT_TYPE_LATEST)
+        self.send_header("Content-Length", str(len(output)))
         self.end_headers()
         self.wfile.write(output)
 
@@ -261,4 +262,6 @@ class MetricsResource(Resource):
 
     def render_GET(self, request):
         request.setHeader(b"Content-Type", CONTENT_TYPE_LATEST.encode("ascii"))
-        return generate_latest(self.registry)
+        response = generate_latest(self.registry)
+        request.setHeader(b"Content-Length", str(len(response)))
+        return response