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Chat Demo

Notes

  • Temporary browser-session sandbox, not published. Session ownership is not authentication.
  • Same-origin and CSRF checks are enforced. No rate-protection or production-readiness guarantee.
  • History retains the welcome plus the latest 25 complete exchanges (51 entries).
  • Messages allow at most 4096 UTF-16 units before trimming; this is not a raw HTTP limit.
  • Chat expires after 30 idle minutes. Streams end after 5 minutes; Resume is explicit.
  • At most 32 chats, two streams per session and 64 streams in this process. Expired resources are reclaimed; valid chats are never evicted for admission.
Connecting to a finite private stream.

ChatModule

A real transcript and composer with application-owned session history and finite SSE.

Temporary, non-published chat. Session ownership is not authentication. Same-origin and CSRF checks are enforced. Only the welcome and latest 25 complete exchanges are retained.
Demo Agent08:08:30

Welcome to your temporary conversation. Send a message to try server-rendered chat and finite SSE updates.

Java composition & chat API
ChatDemoPage module composition
public static Component chatSpecimen(String conversationId, List<ChatMessageView> history) {
    ChatTranscriptRenderer<ChatMessageView, Void> renderer =
        ChatTranscriptRenderer.<ChatMessageView, Void>builder()
            .withEmptyStateText("No messages yet. Start by sending one below.")
            .withBodyTextResolver((message, context) -> message.body()).build();
    Component transcript = new HtmlTag("div").withId("chat-history")
        .withAttribute("data-chat-conversation-id", conversationId)
        .withChild(Alert.warning("Temporary, non-published chat. Session ownership is not authentication. Same-origin and CSRF checks are enforced. Only the welcome and latest 25 complete exchanges are retained."))
        .withChild(renderer.render(history, null));
    TextInput input = TextInput.create("message").withPlaceholder("Type a message").required();
    input.withAttribute("maxlength", "4096");
    input.withAttribute("autocomplete", "off");
    input.withAttribute("autocorrect", "off");
    input.withAttribute("autocapitalize", "off");
    input.withAttribute("spellcheck", "false");
    Form composer = Form.create().withId("chat-composer").withHxPost("/chat/messages")
        .withHxTarget("#chat-history").withHxSwap("outerHTML").addField("Message", input);
    composer.withAttribute("autocomplete", "off");
    composer.withChild(new HtmlTag("input", true).withAttribute("type", "hidden")
        .withAttribute("name", "conversationId").withAttribute("value", conversationId));
    composer.withChild(Button.submit("Send"));
    return ChatModule.create().withModuleId("chat-module").withTitle("ChatModule")
        .withDescription("A real transcript and composer with application-owned session history and finite SSE.")
        .withTranscript(transcript).withComposer(composer)
        .withUiConfig(new ChatUiConfig(conversationId, ChatTransportMode.SSE,
            "/chat/history", "/chat/stream", "#chat-history", "outerHTML", null));
}
// Equivalent to ChatDemoPage's module plus its complete transcript/composer helpers.
// The application owns transport coordination, identity, limits and CSRF.

ChatMessageData supplies message values; DefaultChatMessageComponent renders each message through the transcript renderer. ChatTransportMode and ChatUiConfig describe routing metadata, not an implemented WebSocket server. This site demonstrates SSE only.

Chat helper referenceChatModule API

Related API contracts

ChatMessageComponentChatMessageDataChatTranscriptRendererChatTransportModeChatUiConfigDefaultChatMessageComponent