A real Spring Boot 3.2 app — embedded Tomcat, @RestController, Jackson JSON —
running entirely inside the wasm JVM. This page is an HTTP client that opens a
TCP connection to the server running in the tab and speaks HTTP/1.1 to it. There is
no network: the socket is a loopback stack living in wasm memory
(bind/accept/poll/read/write
emulated), so Tomcat binds 127.0.0.1:8080 and the browser dials it — all in-process.
this page ──HTTP/1.1──▶ emulated TCP loopback (wasm memory)
──▶ Tomcat ──▶ Spring
DispatcherServlet
──▶ @RestController
Response
(boot the app, then send a request)
VM / Spring log