fix: Set Content-Type header for JSON responses in serializeHTTPHandler (#19878)

slim-bean · web-flow · commit 019d6b40a84f · 2025-11-16T06:52:01.000-05:00
diff --git a/pkg/querier/queryrange/serialize.go b/pkg/querier/queryrange/serialize.go
@@ -82,6 +82,7 @@ func (rt *serializeHTTPHandler) ServeHTTP(w http.ResponseWriter, r *http.Request
 		}
 		return
 	}
+	w.Header().Set("Content-Type", "application/json; charset=UTF-8")
 	version := loghttp.GetVersion(r.RequestURI)
 	encodingFlags := httpreq.ExtractEncodingFlags(r)
 	if err := encodeResponseJSONTo(version, response, w, encodingFlags); err != nil {

Original file line number	Diff line number	Diff line change
`@@ -82,6 +82,7 @@ func (rt serializeHTTPHandler) ServeHTTP(w http.ResponseWriter, r http.Request`
`82`	`82`	`}`
`83`	`83`	`return`
`84`	`84`	`}`
	`85`	`+ w.Header().Set("Content-Type", "application/json; charset=UTF-8")`
`85`	`86`	`version := loghttp.GetVersion(r.RequestURI)`
`86`	`87`	`encodingFlags := httpreq.ExtractEncodingFlags(r)`
`87`	`88`	`if err := encodeResponseJSONTo(version, response, w, encodingFlags); err != nil {`