Android webview.loadUrl works with one URL GET string but not Another

I am new at Java and Android so thank for you help.

I wrote a simple Android WebView app to view my home webcam. I can get webview to return a snapshot of the webcam but not send controls to pan etc.

The line that works is

webview.loadUrl("http://myhost.com/snapshot.cgi?user=myusername&pwd=mypassword");

This works and returns a snapshot of my current webcam a FOSCAM

This line DOES NOT WORK!

webview.loadUrl("http://myhost.com/decoder_control.cgi?command=28?user=开发者_开发问答myusername&pwd=mypassword");

The above line uses that same username / password but returns a HTTP 401 Unauthorized error

WHAT is going on.. they both work fine in a browser? and in CURL

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It's likely the second question mark... Why is that there? I imagine it should be an ampersand unless you have some weird protocol.