diff --git a/httpserver-header.lua b/httpserver-header.lua
index d218722..9e52784 100644
--- a/httpserver-header.lua
+++ b/httpserver-header.lua
@@ -2,28 +2,27 @@
 -- Part of nodemcu-httpserver, knows how to send an HTTP header.
 -- Author: Marcos Kirsch
 
-return function (connection, code, extension, isGzipped)
+return function(connection, code, extension, isGzipped)
 
-   local function getHTTPStatusString(code)
-      local codez = {[200]="OK", [400]="Bad Request", [404]="Not Found",}
-      local myResult = codez[code]
-      -- enforce returning valid http codes all the way throughout?
-      if myResult then return myResult else return "Not Implemented" end
-   end
+    local function getHTTPStatusString(code)
+        local codez = { [200] = "OK", [400] = "Bad Request", [404] = "Not Found", [500] = "Internal Server Error", }
+        local myResult = codez[code]
+        -- enforce returning valid http codes all the way throughout?
+        if myResult then return myResult else return "Not Implemented" end
+    end
 
-   local function getMimeType(ext)
-      -- A few MIME types. Keep list short. If you need something that is missing, let's add it.
-      local mt = {css = "text/css", gif = "image/gif", html = "text/html", ico = "image/x-icon", jpeg = "image/jpeg", jpg = "image/jpeg", js = "application/javascript", json = "application/json", png = "image/png", xml = "text/xml"}
-      if mt[ext] then return mt[ext] else return "text/plain" end
-   end
+    local function getMimeType(ext)
+        -- A few MIME types. Keep list short. If you need something that is missing, let's add it.
+        local mt = { css = "text/css", gif = "image/gif", html = "text/html", ico = "image/x-icon", jpeg = "image/jpeg", jpg = "image/jpeg", js = "application/javascript", json = "application/json", png = "image/png", xml = "text/xml" }
+        if mt[ext] then return mt[ext] else return "text/plain" end
+    end
 
-   local mimeType = getMimeType(extension)
-
-   connection:send("HTTP/1.0 " .. code .. " " .. getHTTPStatusString(code) .. "\r\nServer: nodemcu-httpserver\r\nContent-Type: " .. mimeType .. "\r\nnCache-Control: private, no-store\r\n")
-   if isGzipped then
-      connection:send("Cache-Control: max-age=2592000\r\nContent-Encoding: gzip\r\n")
-   end
-   connection:send("Connection: close\r\n\r\n")
+    local mimeType = getMimeType(extension)
 
+    connection:send("HTTP/1.0 " .. code .. " " .. getHTTPStatusString(code) .. "\r\nServer: nodemcu-httpserver\r\nContent-Type: " .. mimeType .. "\r\nCache-Control: private, no-store\r\n")
+    if isGzipped then
+        connection:send("Cache-Control: max-age=2592000\r\nContent-Encoding: gzip\r\n")
+    end
+    connection:send("Connection: close\r\n\r\n")
 end