Problem

• Same issue as Fix RemoteArchive performance by adding bulk read methods #6377: the HttpSender.Response.getBody() method returns an anonymous InputStream wrapper that only overrides the single-byte read() method. When consumers call the bulk read(byte[], int, int) method, Java's default InputStream implementation falls back to calling read() one byte at a time in a loop, resulting in extremely poor performance.

Additionally, the single-byte read() method incorrectly returns 0 when the body is null, but per the InputStream contract, -1 should be returned to indicate end of stream.

Solution

• Add read(byte[] b, int off, int len) override to delegate bulk reads to the underlying stream
• Fix EOF return value from 0 to -1 per the InputStream contract