Templ HTTP

Templ HTTP Integration

Use progressive disclosure: begin with the handler pattern, then add routing and middleware only as needed.

Level 1: Minimal Integration

Use this skill when serving templ from net/http.

1. Parse request input.
2. Build view model/data.
3. Render templ component with r.Context().
4. Handle render errors and status codes.

func homeHandler(w http.ResponseWriter, r *http.Request) {
    if err := components.HomePage().Render(r.Context(), w); err != nil {
        http.Error(w, "render failed", http.StatusInternalServerError)
        return
    }
}

Level 2: Routing and Request Data

• Routes: start with http.NewServeMux() and explicit handlers.
• Methods: branch on r.Method when endpoint serves multiple actions.
• Input sources: query (r.URL.Query()), form (r.ParseForm() + FormValue), path segments.
• Status discipline: set status before rendering non-200 responses.
• Post/Redirect/Get: redirect after successful form POSTs.

Level 3: Production Patterns

• Add middleware for auth/logging/request IDs.
• Return component-based error pages for consistent UX.
• Serve static files with http.FileServer and a dedicated prefix.
• Keep handler functions thin; move business logic into services.

func usersHandler(w http.ResponseWriter, r *http.Request) {
    switch r.Method {
    case http.MethodGet:
        users := listUsers(r.Context())
        _ = components.UserList(users).Render(r.Context(), w)
    default:
        http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
    }
}

Escalate to Other Skills

• Need reusable view APIs: use templ-components.
• Need HTMX partial responses: use templ-htmx.
• Need syntax corrections in .templ: use templ-syntax.

References

• Handlers and routing: resources/handlers-and-routing.md
• Middleware and errors: resources/middleware-and-errors.md
• Request data and response patterns: resources/request-and-response-patterns.md
• Go net/http: https://pkg.go.dev/net/http
• templ server-side rendering: https://templ.guide/server-side-rendering/

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