Android :: How AJAX Requests Work On 2.0 / 2.2 Emulators?

I'm testing out a web page on the Android 2.0 and 2.2 emulators, and the jQuery.ajax() requests that the app makes have slightly different behaviors regarding HTTP Authentication Headers. The server I'm making requests to requires basic authentication, and the ajax requests in 2.2 send the proper auth header. In 2.0, I am debugging with Fiddler, and it seems that the requests do not include the auth header, and the server rejects the request with a 401.2 error. I don't think it matters, but the server is running IIS 7. One interesting thing I noticed while debugging the web requests is that Android 2.2 makes two requests for each resource, whether or not it's an XHR. One does not contain the Auth header, and the second one does. In 2.0, it seems to make 2 requests for everything but XHR's:

Here is the 2.2 header for the first XHR:
GET http://192.168.1.111/sonar/mobileweb/sonar/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/sonar/mobileweb/sonar/sonar.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.2; en-us; sdk Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7

The 2.2 header for the second XHR:
GET http://192.168.1.111/sonar/mobileweb/sonar/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/sonar/mobileweb/sonar/sonar.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.2; en-us; sdk Build/FRF91) AppleWebKit/533.1 (KHTML, like Gecko) Version/4.0 Mobile Safari/533.1
Authorization: Basic cGFyaXZlZGFcZGF2aWQubW9ycmlzOjIzbkx2ZWxsbGw=
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7

And the 2.0 header:
GET http://192.168.1.111/app/views/week/init.ejs HTTP/1.1
Host: 192.168.1.111
Accept-Encoding: gzip
Referer: http://192.168.1.111/app/app.html
Accept-Language: en-US
User-Agent: Mozilla/5.0 (Linux; U; Android 2.0; en-us; sdk Build/ECLAIR) AppleWebKit/530.17 (KHTML, like Gecko) Version/4.0 Mobile Safari/530.17
Accept: text/plain, */*
X-Requested-With: XMLHttpRequest
Accept-Charset: utf-8, iso-8859-1, utf-16, *;q=0.7

Has anyone experienced this behavior before? It is basically causing my app to not work at all in version 2.0. Version 2.1 seems to act the same as 2.0.