# HTTP 服务器

[English](http-server.md) | 中文

[dsh-host-webserver](../../packages/host/webserver) 是 GUI 宿主 web 形态的 HTTP 载体：单个提供 `ctx.httpServer` 的 `node:http` 插件，由具名路由注册表加 index.html 转换挂点组成，兜底是静态 dist 回退。它不属于 agent loop（智能体循环）主干，也不是能力 seam：它不了解任何 harness 概念，每个功能表面（`/api` 桥接、插件 bundle、HMR（热模块替换）事件流）都是由其他插件注册的一条路由（[分层说明](../../.agents/notes/implemented/architecture/2026-07-19-gui-layering-and-rpc-protocol.md)）。仅限 web（浏览器）形态：Electron 通过 `file://` 加载 dist，并经 IPC 桥接承载 fetch，不经过本服务器。

源码：[`packages/host/webserver/src/index.ts`](../../packages/host/webserver/src/index.ts)

## 路由

```ts type-equiv
/** Route match kind: 'exact' matches the pathname verbatim; 'prefix' p matches p and p/<anything>. */
type WebRouteKind = 'exact' | 'prefix'
```

```ts type-equiv
/** One named route registration. */
interface WebRoute {
  kind: WebRouteKind
  /** Absolute pathname, no trailing slash. */
  path: string
  /** Owns the full response lifecycle (may hold the response open, e.g. SSE). */
  handler: (req: IncomingMessage, res: ServerResponse) => void | Promise<void>
}
```

匹配顺序固定：先查 exact 表，再取最长匹配前缀，最后落到已注册的回退。注册顺序不携带任何面向请求的语义：具名路由在组合上互不相交，任何未被具名路由认领的请求都由回退席位应答；席位只有一个所有者，第二次注册会抛出异常。发布的 Web 组合用 [`dsh-frontend-static`](../../packages/host/frontend-static/src/index.ts) 认领席位，即遵循固定语义的 SPA dist 服务器：非 GET/HEAD 返回 405，越出 dist 根目录的遍历返回 403，任何未命中都以 HTTP 200 回退到 `index.html`（SPA 路由），未知扩展名按 octet-stream 发送。

## 配置

```ts type-equiv
/** Gateway config: the listen address. */
interface Config {
  /** Listen host; the two supported values are loopback and all-interfaces. */
  host: '127.0.0.1' | '0.0.0.0'
  /** Listen port; zero requests an OS-assigned port. */
  port: number
}
```

`host` 只接受 `127.0.0.1`（默认姿态）和 `0.0.0.0`（刻意的网络暴露）；没有 TLS、认证或 origin 策略，因此绑定到非回环地址会把服务器暴露给该网络。dist 位置是认领席位的前端插件的组装事实。

## 服务

`HttpServerService`（`ctx.httpServer`）在激活时立即监听；监听失败（EADDRINUSE 等）会从 init 抛出，形成一个 FAILED fiber，由启动的大声失败 sweep 上报。`register(route)` 添加一条具名路由并返回其 disposer；重复的 `(kind, path)` 抛出异常，因为路由模式是组合层契约，冲突即配置错误。`tapIndex(transform)` 添加一个纯的 html 到 html 转换，按注册顺序应用于每个 index 响应（`/` 和每次 SPA 回退）；[dsh-client-modules](../../packages/client/modules) 用它注入启动 manifest（元数据清单）。`port` 读取监听端口，`config.port` 为 0 时读到的是操作系统分配的值。

处理过程中抛出异常的请求（畸形的 % 转义撞上 `decodeURIComponent`、客户端在请求体中途断开）会记录为警告并应答 400（响应头已发出时则销毁 socket），绝不导致进程退出。dispose（资源释放）把 `close()` 与 `closeAllConnections()` 配对使用，因为处理器可能像 SSE（Server-Sent Events）那样保持响应打开，而这类连接永远不会自行结束；没有强制关闭，拆卸就会挂起。该包（package）从不打印输出：URL 行归 shell 所有。逐包运维细节（含开发模式的 bundle 监视流水线）留在 [README](../../packages/host/webserver/README.md) 中。

<!-- BEGIN GENERATED cordis-surface (gen-cordis-catalog.ts) — do not edit between markers -->

<a id="cordis-surface"></a>

## Cordis surface

Generated from source by `scripts/gen-cordis-catalog.ts` (verified fresh by `pnpm run verify-cordis-catalog` in doc-sync; regenerate with `pnpm run gen-cordis-catalog`) — this section is byte-identical in both language sides of the page. Signature blocks use a `ts cordis-catalog` fence and keep the original source JSDoc; dispatch modes are defined in the [primer](../cordis-primer.md#dispatch-modes), and the framework-inherited `ctx` surface lives in [cordis-api/inherited.md](../cordis-api/inherited.md).

<a id="ctxhttpserver--httpserverservice"></a>

### `ctx.httpServer` — `HttpServerService`

The web-shape HTTP carrier service. Activation listens immediately (route registration order carries no request-facing semantics: named routes are composed to be disjoint, and the fallback seat answers anything not yet claimed during the boot window — 404 until its owner registers). A listen failure throws out of init — a FAILED fiber the boot's fail-loud sweep reports.

```ts cordis-catalog
/**
 * Register a named route. Duplicate (kind, path) throws — route patterns are
 * a composition-level contract, so a collision is a misconfiguration.
 * @param route - kind, path, and the owning handler.
 * @returns the disposer removing the route.
 */
register(route: WebRoute): () => void

/**
 * Register an exact-path HTTP upgrade route. Duplicate paths throw because
 * one socket can have only one protocol owner.
 * @param route - pathname and handler owning negotiation plus socket use.
 * @returns the disposer removing the route.
 */
registerUpgrade(route: WebUpgradeRoute): () => void

/**
 * Claim the fallback seat: the handler answering every request no named
 * route matches (the SPA dist server in the shipped Web composition). One
 * owner only — a second registration throws, because two fallbacks cannot
 * compose.
 * @param handler - owns the full response lifecycle of unmatched requests.
 * @returns the disposer releasing the seat.
 */
registerFallback(handler: WebRoute['handler']): () => void

/**
 * Register an index.html transform, applied by the fallback owner to every
 * index response ({@link applyIndexTaps}) in registration order.
 * @param transform - pure html-to-html function.
 * @returns the disposer removing the transform.
 */
tapIndex(transform: (html: string) => string): () => void

/**
 * Run an index.html body through the registered taps in registration order
 * — called by the fallback owner on every index response it renders.
 * @param html - the raw index.html body.
 * @returns the transformed body.
 */
applyIndexTaps(html: string): string
```

Source: [`packages/host/webserver/src/index.ts:60`](../../packages/host/webserver/src/index.ts)
<!-- END GENERATED cordis-surface -->