diff --git a/server/model/monitor.js b/server/model/monitor.js
index c0721c484..ec56ba455 100644
--- a/server/model/monitor.js
+++ b/server/model/monitor.js
@@ -290,9 +290,9 @@ class Monitor extends BeanModel {
                         headers: {
                             "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
                             "User-Agent": "Uptime-Kuma/" + version,
-                            ...(this.headers ? JSON.parse(this.headers) : {}),
+                            ...(contentType ? { "Content-Type": contentType } : {}),
                             ...(basicAuthHeader),
-                            ...(contentType ? { "Content-Type": contentType } : {})
+                            ...(this.headers ? JSON.parse(this.headers) : {})
                         },
                         maxRedirects: this.maxredirects,
                         validateStatus: (status) => {