CVE-2017-16013: Denial of Service via malformed accept-encoding header in hapi

The vulnerability stems from improper error handling in the accept-encoding header processing. The key change in compression.js shows the original implementation didn't handle errors from Accept.encoding(), which would throw and crash the process. The function internals.Compression.prototype.accept is the direct point where malformed input was processed without validation. The request.js changes show this function was called during request initialization, but the root vulnerability resides in the compression.js implementation.