Host Webserver

Web HTTP and upgrade-route registration plugin (default-exported `WebServer`, config `{host, port}`): a `node:http` server that listens on activation and provides `ctx.webServer`. `register(route)` adds a named `exact`/`prefix` HTTP route; `registerUpgrade(route)` adds an upgrade route for an exact pathname. A duplicate path within either table throws because route patterns are a composition-level contract and a collision is a misconfiguration; both methods return a disposer that removes the registration. `registerFallback(handler)` registers the one handler for requests that match no named route. A second registration throws; the SPA dist server [`dsh-host-frontend-static`](../frontend-static/README.md) is the shipped owner, and the server returns 404 while none is registered. Index startup inputs are structured rows: `collectIndexInjections()` gathers a fresh `IndexInjection` table over one `webserver/index-inject` emit per call, and `renderIndex(html)` renders the rows into an index.html body before applying the raw `tapIndex(transform)` transforms in registration order (`applyIndexTaps(html)`, the escape hatch for markup no row expresses); the fallback handler calls `renderIndex` on every index response, and a static deployment ships the same rows over its boot payload, rendering with the exported `renderIndexInjections`. `port` reads the listening port (the OS-assigned value when `port` is 0), and `host` reads the configured bind host (composition-time facts other plugins adapt to, e.g. the directory-picker chooser). HTTP match order is fixed: exact over the whole table, then longest prefix, then the fallback handler. Upgrades match exactly and unmatched connections are closed; registration order carries no request-facing semantics.

• 适用 Agent：DeepSeek Harness
• 适配模型：DeepSeek

@deepseek-ai/dsh-host-webserver

暂无通过审核、可复现的同任务 A/B 运行证据；本档案仅证明来源可信，不代表实测有效。