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A dual-response architecture serves complete HTML when someone opens a URL directly, then returns JSON for supported in-app navigation requests. The browser can use that data to update the page without a full reload, while direct links, refreshes, and crawler visits still reach a server-rendered page. It is a progressive-enhancement design described by HTMP’s author, not a standardized HTTP convention.
How the HTML-and-JSON flow works
- Direct request: The browser, crawler, or a user opening a copied URL requests a page. The server renders the view and responds with HTML.
- Client startup: The browser displays that document and loads JavaScript to attach interactive behavior.
- In-app navigation: For a supported link, client code intercepts the click and requests the destination using
fetch. The server recognizes this as an in-browser navigation and responds with structured JSON. - Page update: The client uses the response to update the relevant DOM and the History API to reflect the destination in the address bar and browser history.
- Direct-load fallback: Refreshing the destination, opening it in a new tab, or following a copied URL must still result in a valid server-rendered page.
That HTML-versus-JSON choice is the design described in the HTMP post by Erlangga Satria. It should not be mistaken for an HTTP rule: an application must define how it identifies navigation requests, what each response contains, and how it handles errors. HTMP project post
What this means for rendering, SEO, and navigation
Initial content is available in the HTML
With server-side rendering, useful page content is present in the initial HTTP response rather than depending entirely on JavaScript to create it. Google says server-side rendering or prerendering can make a site faster for users and crawlers, and notes that not all bots can run JavaScript. That can make content easier to access, but it does not guarantee indexing or rankings: Google describes crawling, rendering, and indexing as separate stages, and JavaScript processing can have limitations and timing effects. Google Search Central: JavaScript SEO basics
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Keep links and URLs meaningful
Use ordinary links with real href destinations so navigation remains meaningful outside the client-side router. Google recommends the History API for SPA routing and cautions against using URL fragments to represent distinct content. A route should work both when reached through an in-app transition and when requested directly from the server. Google Search Central: JavaScript SEO basics
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History is part of the feature
Updating the visible page is not enough: the address bar, Back, and Forward behavior must stay consistent with the view. Test navigation after several route changes, then use Back and Forward and reload a deep link. The HTMP description uses browser fetch and history APIs; the available post does not establish how its project handles every history or failure case. HTMP project post
Trade-offs compared with all-SSR and all-CSR
| Dimension | Server-rendered pages | Client-rendered SPA | Dual-response hybrid |
|---|---|---|---|
| First response | Content is rendered into the server’s HTML response. | Initial content may depend on JavaScript running in the browser. | Direct requests return rendered HTML; supported in-app requests return JSON for client updates. |
| Navigation | Typically loads a new document for each page. | Typically updates the interface client-side. | Uses client-side transitions after startup while retaining server handling for direct URLs. |
| Server and client work | Rendering adds server work and implementation complexity. | More rendering work occurs in the browser; initial loads can be slower. | Requires both server rendering and client navigation logic, so complexity and server workload depend on implementation. |
| Search and crawler access | Page content is available in returned HTML. | Can rely on crawler JavaScript rendering and correct client routing. | Direct HTML responses can expose content, but crawlable links, route responses, status codes, and rendering still need to be correct. |
| Evidence for HTMP’s reported performance | Not established as a comparative baseline. | Not established as a comparative baseline. | HTMP’s author reports project figures; no reproducible protocol or independent comparison is provided in the cited post. |
This is a design-level comparison, not a measured head-to-head test. SSR can increase rendering cost and implementation complexity; CSR can support responsive transitions but may have slower initial loads and search challenges. A hybrid adds the responsibility of keeping server and client routes, data, and errors aligned. Choose based on the initial response your users need, the navigation experience, server capacity, crawler requirements, and the complexity your team can maintain. web.dev: Rendering on the Web
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What the published performance figures do—and do not—show
HTMP author Erlangga Satria reports a gzip size of 3.8 KB and a 150 ms update for a reactive table with 1,000 rows. The post says the benchmark target includes low-end Android phones, but does not provide a reproducible test protocol, device-specific results, independent replication, or a comparison baseline. Treat both numbers as author-reported project claims, not general performance guarantees or evidence that this architecture is faster for another application. HTMP project post
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Session cookies: useful protection, not a complete security strategy
HTMP’s post describes using HTTP-only cookies and avoiding JWTs in browser local storage. An HttpOnly cookie cannot be read by JavaScript, and a Secure cookie is sent only over HTTPS. Those attributes limit script access and transport; they do not make a session immune to XSS. Malicious same-origin script may still issue requests using the user’s active session even if it cannot read the cookie. MDN: HTTP cookies
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Cookie attributes do not replace server-side authorization, appropriate CSRF defenses, output encoding, or sound session lifecycle controls. The client should never be treated as the authority for whether a user may perform an action; the server must validate each protected operation.
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Implementation checks before shipping
- Progressive fallback: Ordinary links have working destinations if JavaScript is unavailable or fails.
- Deep links: Each route returns the intended page when requested directly, including after a refresh.
- Response semantics: HTML and JSON responses have clear content types, useful status codes, and defined error behavior.
- History and concurrency: Back and Forward match the displayed view; rapid or overlapping requests do not leave stale content or state.
- Mutations and access: Server-side authorization and applicable request protections cover actions initiated by the client.
- Real browser coverage: Test the browsers, devices, and network conditions your audience uses; the cited project post does not establish broad compatibility or behavior under failures.
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