fetch request file://xxxxx

[Benja Van]

I am developing an extension program for markdown reader, which is being transferred to V3 version recently. Since the manifest of V3 version does not support XMLHttpRequest API, I can only use fetch API. However, fetch cannot request the local file address of the file:// protocol, so I cannot realize the function of automatically requesting the changes of local files in the extension program and rendering markdown in real time. Do you have any good technical suggestions? 

[Stefan Van Damme]

Hi there,

The File System Access API can read the content of your file. See this helpful resource:

https://web.dev/file-system-access/

Thanks,

Stefan vd

[wOxxOm]

`fetch` can access file:// scheme since Chrome 99.

[Moe Bazzi]

fetch does with with file:// url schemes but you also need to have the 'file://' host permission set in your manifest and also the user has to manually go to your extensions detail page and check the 'Allow access to file urls' toggle (see screenshot) 

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[Jackie Han]

// in manifest.json

  "host_permissions": [
    "file://*/*"
  ],

In extension details

In my test, load unpacked extension with file:// permission, chrome allow above toggle automatically.

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[Moe Bazzi]

Jackie, are you sure that chrome had the 'Allow access to file URLs' toggle on automatically? If so, this is huge. I wonder if this works for extensions downloaded from the store. Also, was this MV2 or MV3?

[Jackie Han]

Yes, it is MV3. I only tested from my local unpacked extension, I don't know CWS.

[wOxxOm]

It is enabled by default only for unpacked extensions.

[Rxtester Beijing]

Hi wOxxOm,
Do you have any suggestion about the issue: https://groups.google.com/a/chromium.org/g/chromium-extensions/c/ybJCN4YX_uU