:sig
RENDER(Request& context)

:desc
Defines the main HTTP render handler for the current `.uce` page.

When a page is requested over HTTP, the runtime loads the target file and calls its `RENDER(Request& context)` function.

Pages may also export additional named render handlers with `RENDER:NAME(Request& context)`.

Named render handlers are not used for the page's direct HTTP entrypoint. They are intended for component-style sub-rendering through helpers such as `component("components/card:BODY", props, context)` or `render_component("components/card:BODY", props, context)`.

The default page entrypoint is always the plain `RENDER(Request& context)` handler.

The request environment is passed explicitly through `context`, including params, cookies, post data, session state, headers, uploaded files, and the current `context.call` tree.

For a normal direct page request, `context.call` starts empty.

If the page is invoked from another UCE file via `render_file(file_name, context)`, the callee receives that same `context`.

Pages intended to serve WebSocket traffic may expose both `RENDER(Request& context)` and `WS(Request& context)`. In that case `RENDER(Request& context)` serves the initial HTTP response and `WS(Request& context)` handles subsequent WebSocket messages.

:see
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