Setting CoreWebView2EnvironmentOptions Language property doesn't change accept-language http header

[jebihug]

Description
Setting CoreWebView2EnvironmentOptions Language property doesn't change accept-language http header unless you delete the Preferences file or use a new userDataFolder path.

As reported in #833

Version
Runtime: 114.0.1823.79
Framework: Win32
OS: Win10

AB#45519111

[LiangTheDev]

That's the current behavior. I created an internal work item to track the issue. We'll either update the document or make it work as expected.

At the mean time, could you try to use --accept-lang command line switch to see whether it works? Something like ICoreWebView2EnvironmentOptions::put_AdditionalBrowserArguments(L”--accept-lang=es-MX”);

[jebihug]

Indeed, this works. I can set the accept languages list at initialization using the switch "accept-lang".
By the way, the "accept-language" http header seems to be "calculated" using the concatenation of the "lang" and "accept-lang" switches. Good.
Nevertheless it is not possible to change neither the lang or the accept-lang after initialisation.
Using Edge, if I change my parameter "Preferred languages" I can immediatly see the change in the "accept-language" http header.

[victorhuangwq]

#3302 @olegsavelos Do you think this is relevant?

[champnic]

Fixed in runtime versions 118.0.2061.0+. Thanks!

[olegsavelos]

#3302 @olegsavelos Do you think this is relevant?

If the fix involves forwarding WM_INPUTLANGCHANGE to the WebView WPF host window then yes, I made a workaround by periodically checking Chrome_SystemMessageWindow of web view with GetKeyboardLayout in order to be able to understand when the input language have changed so if you fixed that then great and I can get rid of this small hack.