TChromiumCore.AcceptLanguageList not working in recent Chromium versions

[salvadordf]

The TChromiumCore.AcceptLanguageList property sets the new value in the browser preferences correctly but it's ignored by Chromium recently.

The Browser.Host.RequestContext.CanSetPreference function returns true and the new value seems to be set but Chromium overrides it with the default GlobalCEFApp.AcceptLanguageList value.

Some browser preferences are not used by Chromium and we can only read them.

Using the TChromiumCore.OnBeforeResourceLoad event to replace the "Accept-Language" HTTP header might be a workaround.

See the discussion here

[salvadordf]

After further testing, the TChromiumCore.AcceptLanguageList property seems to work fine as long as it's set after creating the browser. The browser cache has to be cleared to see the results in some cases.

Navigate to this website to test this property.

Tested using the menu option to change the Accept Language List in the MiniBrowser demo and CEF 132.3.1.

GlobalCEFApp.AcceptLanguageList also works correctly.

[SteIngODF]

Hi, since CEF version 127 we have had a problem with Accept-Language.

I just carried out the test with Cef version 132 and the mini browser. After changing the Accept Language via the menu options, the set Accept Language is only used the first time. If the page is reloaded, the default "en-US" is used instead of Accept-Language.

[salvadordf]

I'll check this issue again as soon as I can. Meanwhile, use the GlobalCEFApp.AcceptLanguageList property.

[salvadordf]

I tried to reproduce this issue navigating to several websites and reloading the site in the previous link several times and I can't reproduce it in my computer.

I used 'it' (Italian) as the TChromiumCore.AcceptLanguageList property value in the MiniBrowser tests. I always saw the 'it' ACCEPT-LANGUAGE header in whatismybrowser.com

I'll reopen this issue anyway.

[SteIngODF]

Hi,

I tested this again on myself. My surroundings:

CEF4Delphi: Master with cef_binary_132.3.2

• Delphi 12.2, Windows version 11
• Delphi 10.3, Windows version 10

Reproduced with "Mini-Browser" sample

• Launch mini browser
• Go to page "https://www.whatismybrowser.com/detect/what-http-headers-is-my-browser-sending/".
  ==>> Accept language is "en-US,en;q=0.9"
• Open Options/Accept-Language and set "Accept Language list" to "de-DE".
• Click Open or Reload "https://www.whatismybrowser.com/..."
  ==>> Accept language is "de-DE,de;q=0.9"
• Click Open or Reload "https://www.whatismybrowser.com/..."
  ==>> Accept language is "en-US,en;q=0.9"
• Open Options/Accept-Language and set "Accept Language list" to "de-DE1".
• Click Open or Reload "https://www.whatismybrowser.com/..."
  ==>> Accept language is "de-DE1,de;q=0.9"
• Click Open or Reload "https://www.whatismybrowser.com/..."
  ==>> Accept language is "en-US,en;q=0.9"