How to use a local file to test a program

Hi HeavensSentSword, If your purpose is to make an http call to get a file, it can be done by setting up a local website on your pc (you can use a program like XAMPP)

Once you create the local website, you can place the txt file under the web folder; to call it from your browser you should write "localhost/txtfile.txt" for example.
To call it form your app you must use the IP Address of your pc that has the local website on.
Example your pc has the IP 192.168.1.100 and you placed the file in the root folder of the website, the url that must be called from the app will be http:192.168.1.100/name_of_file.txt

I have tried and it worked for me with no issues.
I created a local web site on my pc, then made a test app in which I called the txt file using the url written before.

Hope you understand what I wrote, my english is not so good.