Intercept POST requests in a WebView

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I was facing the same issue a few days ago.

So I built a library that solves it:

https://github.com/KonstantinSchubert/request_data_webviewclient

It is a WebViewClient with a custom WebResourceRequest that contains the POST/PUT/… payload of XMLHttpRequest requests.

It only works for these though – not for forms and other kind of request sources.

The hack works, basically, by injecting a script into the HTML that intercepts XMLHttpRequest calls. It records the post/put/… content and sends it to an android.webkit.JavascriptInterface. There, the request is stashed until the shouldInterceptRequest method is called by Android …

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