A public test site for Security Service Edge gateways, HTTP proxies, and content inspection products — with real H1, H2, and H3/QUIC endpoints.
New here? Start with How to Test Your SSE Gateway.
A public test site for Security Service Edge gateways, HTTP proxies, and content inspection products — with real H1, H2, and H3/QUIC endpoints.
New here? Start with How to Test Your SSE Gateway.
What is this?
The site exposes controlled test content through a matrix of purpose-built hostnames. Each hostname enforces a specific protocol setup — HTTP/1.1 (H1), HTTP/2 (H2), HTTP/3/QUIC (H3), cleartext variants, standard ports, or alternate ports. DNS HTTPS records and server-side ALPN enforcement make the expected behavior explicit and testable.
Use the Hostname Matrix to see whether your browser or gateway reaches H1, H2, or H3 as expected, and whether Alt-Svc and DNS HTTPS records are preserved.
Use the Content Filter page to distinguish simple URL blocking from real response-body inspection with EICAR and benign control content.
Use the Download Test to measure throughput and detect modification, truncation, or corruption introduced in transit.
SSE TestCenter is a purpose-built origin site for testing modern HTTP/HTTPS gateways, Security Service Edge (SSE) platforms, inline proxies, and content inspection engines. It is the successor to csm-testcenter.org, extended for HTTP/3, QUIC, DNS HTTPS records, and modern SSE architectures. It is operated by Cloud Fellows GmbH.
SSE stands for Security Service Edge: cloud-delivered security services that proxy, inspect, and control user traffic to the web, cloud services, and private applications.