47 lines
1.9 KiB
Plaintext
47 lines
1.9 KiB
Plaintext
:title
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RENDER
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:sig
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RENDER(Request& context)
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:see
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>ob
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>1_COMPONENT
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>1_INIT
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>1_ONCE
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>1_WS
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:content
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Defines the main HTTP render handler for the current `.uce` page.
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When a page is requested over HTTP, the runtime loads the target file and calls its `RENDER(Request& context)` function.
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## Entry Point Behavior
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The default page entrypoint is always the plain `RENDER(Request& context)` handler.
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Reusable component handlers live on `COMPONENT(Request& context)` and `COMPONENT:NAME(Request& context)`. The component helpers call those handlers, not `RENDER()`.
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The request environment is passed explicitly through `context`, including params, cookies, post data, session state, headers, uploaded files, and the current `context.props` tree.
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If the file defines `ONCE(Request& context)`, the runtime calls that hook once per request before the first `RENDER()` or `COMPONENT...` entrypoint from that unit runs.
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If the file defines `INIT(Request& context)`, the runtime calls that hook once when the worker loads the compiled unit into memory.
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For a normal direct page request, `context.props` starts empty.
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If the page is invoked from another UCE file via `unit_render(file_name, context)`, the callee receives that same `context`.
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Pages that serve WebSocket traffic may expose both `RENDER(Request& context)` and `WS(Request& context)`. Files may also define `COMPONENT()` handlers when one unit needs both page and component behavior.
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In that case:
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- `RENDER(Request& context)` serves the direct HTTP response
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- `WS(Request& context)` handles later WebSocket messages
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- `COMPONENT()` remains available only through the component helpers
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## Related Concepts
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- PHP: front controller entrypoints, template files, `include`, `require`, and route handlers that write the HTTP response
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- JavaScript / Node.js: Express or Fastify route handlers, page controller functions, and SSR entrypoints that build a response
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