Resources

SSE TestCenter is an open test facility for engineers building and evaluating Security Service Edge (SSE) products, HTTP/HTTPS proxies, and network inspection engines. Its core feature is a matrix of hostnames, each of which enforces exactly the set of protocols and ports its name implies — no more, no less.

Every hostname carries a DNS HTTPS resource record (RFC 9460) that tells clients which protocols and ports to use before the first packet is sent. The server-side listener configuration then enforces the same constraint. Together, they let you observe whether an inline SSE product respects the advertised ALPN preference, passes Alt-Svc upgrade headers through to the client, and handles protocol fallback correctly.

History and context

This site is the successor to csm-testcenter.org, which has served the web gateway and content inspection community since 2004. The CSM Testcenter remains available for legacy gateway testing; SSE TestCenter extends it for HTTP/3, QUIC, and modern SSE architectures.

Cloud Fellows GmbH

Cloud Fellows GmbH is a cybersecurity engineering company based in Paderborn, Germany. We build protocol-layer infrastructure for SSE vendors and enterprise security teams. Our work includes HTTP/HTTPS gateway software, SSH inspection, and ICAP-based content inspection — with roots going back to the early days of the Webwasher / McAfee / Skyhigh Security product lineage and co-authorship of RFC 3507 (ICAP).

Contact

Questions about the test site, feature requests, or reports of unexpected behavior: testcenternospam@nocloudfellows.de

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