System.Net.WebException: The connection was closed unexpectedly. How to fix?

Question

Vue.js

Good evening!
Unhandled exception of type 'System.Net.WebException' in System.dll
Additional information: The request was aborted: The connection was closed unexpectedly.

public static string GetFileNameModePack(string url)
{
    string result;

    using (var client = new WebClient())
    {
        result = client.DownloadString(new Uri(url));
    }

    return result;
}

Bottom line: I specify a link to a folder with files, and if there are few files (189), then there is no error, and if there are many (1656), then an error occurs.
This is not a complete code, but it is enough to get an error. Tried to make the method both asynchronous and synchronous.
Tell me, please, how to fix it? Which day I'm raping Google, I can't decide.

Answer 1

Use this component (or check out the sources) https://www.npmjs.com/package/vue-search-select
There is an example moreta.github.io/vue-search-select/#/ModelAjax

Answer 2

System.IO namespace
Classes File, Directory