AddHttpHeader does not work

[ashraful29]

AddHttpHeader does not work when use post url in Webview

[ocram]

Thank you very much!

As you can see here, it's actually (and unfortunately) expected behaviour and documented accordingly.

I'm afraid the only solution to this problem would be using WebViewClient#shouldInterceptRequest (available on API levels 11+ and 21+, respectively) instead of WebViewClient#shouldOverrideUrlLoading.

But in that case, we would have to do all resource requests (pages, images, CSS, JS, etc.) ourselves, i.e. download them with a HTTP client.

But you can do this yourself already without changing this library: Just implement those WebViewClient methods yourself and apply your custom WebViewClient instance via setWebViewClient.