Support custom success codes in http input (#6549)

plugins/inputs/http/http.go

@@ -29,6 +29,8 @@ type HTTP struct {
 	Password string `toml:"password"`
 	tls.ClientConfig
 
+	SuccessStatusCodes []int `toml:"success_status_codes"`
+
 	Timeout internal.Duration `toml:"timeout"`
 
 	client *http.Client
@@ -71,6 +73,9 @@ var sampleConfig = `
   ## Amount of time allowed to complete the HTTP request
   # timeout = "5s"
 
+  ## List of success status codes
+  # success_status_codes = [200]
+
   ## Data format to consume.
   ## Each data format has its own unique set of configuration options, read
   ## more about them here:
@@ -101,6 +106,11 @@ func (h *HTTP) Init() error {
 		},
 		Timeout: h.Timeout.Duration,
 	}
+
+	// Set default as [200]
+	if len(h.SuccessStatusCodes) == 0 {
+		h.SuccessStatusCodes = []int{200}
+	}
 	return nil
 }
 
@@ -171,12 +181,19 @@ func (h *HTTP) gatherURL(
 	}
 	defer resp.Body.Close()
 
-	if resp.StatusCode != http.StatusOK {
-		return fmt.Errorf("Received status code %d (%s), expected %d (%s)",
+	responseHasSuccessCode := false
+	for _, statusCode := range h.SuccessStatusCodes {
+		if resp.StatusCode == statusCode {
+			responseHasSuccessCode = true
+			break
+		}
+	}
+
+	if !responseHasSuccessCode {
+		return fmt.Errorf("received status code %d (%s), expected any value out of %v",
 			resp.StatusCode,
 			http.StatusText(resp.StatusCode),
-			http.StatusOK,
-			http.StatusText(http.StatusOK))
+			h.SuccessStatusCodes)
 	}
 
 	b, err := ioutil.ReadAll(resp.Body)