fix(inputs.prometheus): Correctly handle host header (#15195)

(cherry picked from commit 6bb3d32)
influxdata · Apr 22, 2024 · 559e8ad · 559e8ad
1 parent 1aa00c7
commit 559e8ad
Showing 1 changed file with 5 additions and 1 deletion.
diff --git a/plugins/inputs/prometheus/prometheus.go b/plugins/inputs/prometheus/prometheus.go
@@ -437,7 +437,11 @@ func (p *Prometheus) gatherURL(u URLAndAddress, acc telegraf.Accumulator) (map[s
 	}
 
 	for key, value := range p.HTTPHeaders {
-		req.Header.Set(key, value)
+		if strings.EqualFold(key, "host") {
+			req.Host = value
+		} else {
+			req.Header.Set(key, value)
+		}
 	}
 
 	var err error