1436017 - fetch() a relative chrome: url results in error "x is not a valid URL"

Status: UNCONFIRMED

(Core :: DOM: Core & HTML, defect, P3)

Description

[Duan Yao]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:58.0) Gecko/20100101 Firefox/58.0
Build ID: 20180128191252

Steps to reproduce:

Navigate to chrome://devtools/content/framework/connect/connect.xhtml ,
, open devtools, and run this code `fetch('connect.xhtml')`.


Actual results:

A "TypeError: connect.xhtml is not a valid URL".


Expected results:

fetch() shoud succeed.

Comment 1

[Ben Kelly [:bkelly, not reviewing]]

We require absolute URLs in chrome script.  Since chrome script does not always have a window its unclear where we should be getting a base URL from automatically.  This would be the case even if we fix bug 1432481.

Comment 2

[Boris Zbarsky [:bzbarsky]]

We could use the window base URL if the global is a window, even if it's system...  I agree that for a JSM or something that's more complicated.

Comment 3

[Duan Yao]

(In reply to Ben Kelly [:bkelly] from comment #1)
> We require absolute URLs in chrome script.  Since chrome script does not
> always have a window its unclear where we should be getting a base URL from
> automatically.  This would be the case even if we fix bug 1432481.

However, XHR works fine with the same url:

  var xhr = new XMLHttpRequest();
  xhr.open('GET','connect.xhtml');
  xhr.send();

Comment 4

[Anne (:annevk)]

Since XMLHttpRequest works this seems worth fixing to me.

Comment 5

[Ben Kelly [:bkelly, not reviewing]]

Andrea, do you know how XHR does relative chrome script URL resolution?  Do you have any bandwidth to fix this in fetch()?

Comment 6

[Andrea Marchesini [:baku]]

Actually, following the STR, fetch("connect.xhtml") works fine because there is a chrome window.
But if I run this code in a JSM:

>   var xhr = new XMLHttpRequest();
>   xhr.open('GET','connect.xhtml');
>   xhr.send();

it fails as fetch() does: SyntaxError: The URI is malformed.