You can't pass values from the URL to populate the fields.
You can create a server-side, FDF, XDP (XFA), XFDF and output to buffer, which will populate PDF in browser.
What type of web server are you running? MS .NET or PHP?
If you are running MS .NET, then check out:
www.fdftoolkit.net (C#/VB.net)
or iTextSharp (C#/VB.net)
If you are running PHP, then check out:
iText (Java)