[RFE] provide request entities in a more abstract way

[Ortwin Glück]

Providing only an InputStream as a request body is not enough. We can 
not automatically repeat such a request since we are unable to reset the 
input stream without buffering it. I suggest we introduce an abstraction 
for the source of request entities such as:

interface RequestEntity {
  /**
   * Provides an input stream of the request entity. The method may be 
called
   * more than once and must provide a virgin stream upon each call.
   */
  InputStream getAsStream();
}

We can then provide convenience classes that implement this interface, 
such as:

* class StringRequestEntity implements RequestEntity

* class FileRequestEntity implements RequestEntity

etc.

What does everybody think about this?

Odi
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