Add optional API key support for server authentication in inventoryWebBridge

inventoryWebBridge.lua

@@ -22,6 +22,7 @@ local ORDER_CHANNEL      = 4201
 -------------------------------------------------
 
 local CONFIG_FILE = ".webbridge_config"
+local API_KEY = nil  -- optional API key for server auth
 
 local function loadConfig()
     if fs.exists(CONFIG_FILE) then
@@ -47,7 +48,6 @@ local latestState = nil  -- last broadcast from master
 local modem = nil
 local modemName = nil
 local running = true
-local API_KEY = nil  -- optional API key for server auth
 
 -------------------------------------------------
 -- Find modem
@@ -75,7 +75,7 @@ local function httpPost(path, body)
     local headers = { ["Content-Type"] = "application/json" }
     if API_KEY then headers["Authorization"] = "Bearer " .. API_KEY end
 
-    local ok, err = pcall(function()
+    local ok, result = pcall(function()
         local response = http.post(url, data, headers)
         if response then
             local responseData = response.readAll()
@@ -84,10 +84,10 @@ local function httpPost(path, body)
         end
     end)
 
-    if not ok then
-        -- Silent fail, will retry
-        return nil
+    if ok then
+        return result
     end
+    return nil
 end
 
 local function httpGet(path)