From ade4a7ae91b1bd8367c1d51ac73396f1d91bc903 Mon Sep 17 00:00:00 2001
From: Thomas E Lackey <telackey@bozemanpass.com>
Date: Fri, 20 Jan 2023 20:08:19 -0600
Subject: [PATCH] Only attempt to parse the body when it is present.

---
 pkg/prom/middleware.go | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/pkg/prom/middleware.go b/pkg/prom/middleware.go
index b90c1c87..6227884a 100644
--- a/pkg/prom/middleware.go
+++ b/pkg/prom/middleware.go
@@ -58,9 +58,11 @@ func preprocessRequest(r *http.Request) (*http.Request, error) {
 
 	// All API requests should be JSON.
 	var result map[string]interface{}
-	err = json.Unmarshal(body, &result)
-	if nil != err {
-		return nil, err
+	if len(body) > 0 {
+		err = json.Unmarshal(body, &result)
+		if nil != err {
+			return nil, err
+		}
 	}
 
 	// Pull out the method name, request ID, user ID, and address info.