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From: Frank Kozuschnik <franko@nurfuerspam.de>
Newsgroups: comp.lang.javascript
Subject: Re: IIS http.open "GET" error
Date: Fri, 9 Oct 2020 17:33:21 +0200
Organization: solani.org
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Arno Welzel:

> 1) Make sure IIS works at all - put the file named SPASSKY.JCH to the
> root directory and check that http://localhost/SPASSKY.JCH or
> http://127.0.0.1/SPASSKY.JCH gives you the content of that file.

In a default setup, IIS will return a HTTP 404 error because the '.JCH' 
suffix ("extension") is unknown. Adding the suffix to the "MIME Types" 
list of the IIS configuration may help.

> 2) XHR does not load "files" it will send a HTTP request for an *URL*.
> Also see
> <https://developer.mozilla.org/en-US/docs/Web/API/XMLHttpRequest/open>.
> Therefore you should also put the URL there and not just a file name.

"Just a file name" *is* a valid URL, typically relative to the URL of 
the current document. See RFC 1808 for details.