Add simple async get function

Also add minor comment

python/lsst/ts/rubintv/handlers/websocket_notifiers.py

@@ -46,6 +46,7 @@ async def send_notification(
 ) -> None:
     datestamp = get_current_day_obs().isoformat()
     if messageType is MessageType.CAMERA_PD_BACKDATED and payload:
+        # use the day_obs in the backdated event, rather than today
         datestamp = payload.values()[0].get("day_obs", datestamp)
     try:
         await websocket.send_json(

src/js/modules/utils.js

@@ -18,6 +18,17 @@ export async function simplePost (url) {
   return data
 }
 
+/**
+ * @param {RequestInfo | URL} url
+ */
+export async function simpleGet (url) {
+  const res = await fetch(url, {
+    method: 'GET',
+  })
+  const data = await res.text()
+  return data
+}
+
 /**
  * @param {string} tagName
  * @param {string} className