Close response stream on unsupported content encoding

[jmestwa-coder]

Summary

This fixes a response stream leak in UrlRequestTransport when the server returns an unsupported Content-Encoding.

Problem

• send() opens the response InputStream.
• When Content-Encoding is unsupported, the method reports a transport failure and returns immediately.
• The opened stream is not closed before returning.

Fix

• Close the response stream before returning from the unsupported encoding branch.
• No changes to existing success or failure behavior.
• No changes to transport callbacks or response handling.

[tbroyer]

Won't connection.disconnect() in the finally block already take care of this?

[zbynek]

This makes the code more symmetrical (the stream is explicitly closed when encoding is correct, so closing it when it's incorrect makes sense). OTOH @tbroyer is right that the stream is closed automatically in disconnect (at least with OpenJDK).