Methods addRequestProperty(String,String), setRequestProperty(String,String),
getRequestProperty(String) not perform as specified in the documentation.
If the methods have no implementation they should be declared as abstract.
Probably, other methods also aren't implemented.

See attached example.
###@###.### 2005-2-18 10:03:14 GMT
more precisely: set/add/getRequestProperty wrongly processes empty key string.
It seems getRequestProperty( '' ) always return null.

A small problem: the API doesn't provide method to reset property value.
In addition, the documentation doesn't specify what setRequestProperty(<key>, <key default value>) does.
There are two possibilities: reset this property, or treat default value as any other value. The difference is in execution of next addRequestProperty method.