Merge pull request 'fix: series removal sent its status line twice' (#176) from fix/series-remove-double-writeheader into main

backend/internal/web/admin_series.go

@@ -505,10 +505,13 @@ func (h *Handler) adminSeriesRemove(w http.ResponseWriter, r *http.Request) {
 		band = 1
 	}
 	h.render(w, http.StatusOK, "series-row", seriesRow(a, band, time.Now()))
+	// The heading is an out-of-band append to a response whose status line has
+	// already gone out with the row, so it is executed straight onto w —
+	// h.render would send a second WriteHeader.
 	if head, err := h.seriesListHeadView(r); err != nil {
 		log.Printf("series remove %s: %v", site+":"+seriesID, err)
-	} else {
-		h.render(w, http.StatusOK, "series-list-head", head)
+	} else if err := h.tmpl.ExecuteTemplate(w, "series-list-head", head); err != nil {
+		log.Printf("series remove %s: render series-list-head oob: %v", site+":"+seriesID, err)
 	}
 }