The compression middleware filter runs before route handlers, so the
res.getHeader('Content-Type') check in shouldSkipCompression is always
undefined at decision time. SSE exclusion relied entirely on the Accept
header, which non-standard clients (curl, fetch) may omit.
Add deterministic path-based exclusion for all known SSE routes so
compression is skipped regardless of client behavior. Also add a Caddy
reverse proxy example and a CDN double-compression warning to docs.
jwcrystal