Fix: Solve 204 No Content Error

[jdalvar3z]

Solve 204 No Content Error

See issue #431 for Context

• Refactored parseNetworkResponse to handle 204 No Content responses gracefully.
• Added check for null or empty response.data to return Response.success with an empty JSONObject instead of triggering a Response.error.
• Optimized code by extracting HttpHeaderParser.parseCacheHeaders to a local variable for reuse, improving readability and performance.
• Maintained existing functionality for non-empty responses while enhancing clarity and maintainability.

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[jpd236]

My stance here is largely unchanged from what I said here: #431 (comment)

In particular, we're making an assumption that an empty response body should be treated as equivalent to "{}", and while that seems logical, I can easily imagine existing applications that would not expect that change and could fail in significant ways. While I agree this would probably have made sense if this were a brand new class, I'm very hesitant to change the existing behavior of a long-standing class in a semantically meaningful way.

Our priority at this point is maintaining Volley's functionality for existing users. New users shouldn't be using these classes as noted there - or, for that matter, Volley in general. There are more modern recommendations at https://developer.android.com/develop/connectivity/network-ops/connecting#choose-http-client. So while it may seem counterintuitive, I think it's best to maintain existing behavior in case of any doubt.