TYPO3 Core

How to create the problem:¶

1. Check your settings for [SYS][textfile_ext]. Be sure "md" is not whitelisted/allowed. My Setup was

[SYS][textfile_ext] => 'txt,ts,typoscript,html,htm,css,tmpl,js,sql,xml,csv,xlf,yaml,yml'

2. Go to module filelist
3. Click on + (New),
4. Create new textfile" with a disallowed file extension – im my case "_test.md_"

Now you should get an Error:

(1/1) #1436717278 InvalidArgumentException
The given status code is not a valid HTTP status code.

But the file "test.md" is still created.

Expected Behaviour:

1: No Error / Exception
2: Flash message: "Files with that extension are not editable. Allowed extensions are: txt,ts,typoscript,html,htm,css,tmpl,js,sql,xml,csv,xlf,yaml,yml"