Android Custom Protocol always returns an empty body

[jkelleyrtp]

The code for creating request bodies on android always sets the body to be an empty vec:

wry/src/android/binding.rs

Lines 160 to 167 in cbbcccc

	let final_request = match request_builder.body(Vec::new()) {
	Ok(req) => req,
	Err(e) => {
	#[cfg(feature = "tracing")]
	tracing::warn!("Failed to build response: {}", e);
	return Ok(*JObject::null());
	}
	};

No other platforms do this, breaking custom protocol support on android.

The core reason is because android's shouldInterceptRequest doesn't provide the body. I would imagine wry should paper over this issue rather than let it bubble up to user code.

• https://issuetracker.google.com/issues/119844519
• https://stackoverflow.com/questions/43273640/android-webviewclient-how-to-get-post-request-body
• https://developer.android.com/reference/android/webkit/WebViewClient#shouldInterceptRequest(android.webkit.WebView,%20android.webkit.WebResourceRequest)
• https://stackoverflow.com/questions/46481042/how-to-get-the-body-of-the-webresourcerequest-in-android-webview

You can work around this by exposing a JavaScriptInterface object to the webview as shown here

https://github.com/acsbendi/Android-Request-Inspector-WebView/blob/master/app/src/main/java/com/acsbendi/requestinspectorwebview/RequestInspectorJavaScriptInterface.kt