EveSynapse status

A public status page for EveSynapse. It is hosted on Cloudflare Pages, apart from the EveSynapse servers, so it still loads when they are down.

Once a minute the page checks, straight from the visitor's browser, each source listed in config.js:

• EveSynapse: the app's /status.json, a state for each of its services.
• Market API: the market API's health at /api/market/v1/health on its own host, so an unreachable API host shows apart from the main site.
• EVE Online API (ESI): ESI's own Tranquility status, read directly from esi.evetech.net, so it still shows when EveSynapse is down.

Each service shows its state: working, degraded or down. A source that does not answer, answers with an error, is blocked by CORS or takes longer than 10 seconds is reported as unreachable, and its services are shown as unknown, never as working. The page keeps the last 60 checks in the visitor's browser as a strip of colored ticks.

Plain HTML, CSS and JavaScript. There is no build step, no Node and no bundler.

Files

File	What it is
index.html	The page, with the site's wordmark and the Content-Security-Policy meta tag
config.js	The servers the page checks
status.js	Fetches each /status.json and draws the page
style.css	The look, in the site's colors and fonts, dark and light
_headers	Response headers Cloudflare Pages adds
fonts/	The site's fonts (SIL Open Font License, see fonts/NOTICE.txt)
favicon.svg	The site's icon

What a server reports

GET /status.json answers without a session, from what the server already holds, rebuilt at most every 30 seconds and rate limited per address:

{
  "state": "ok",
  "checked_at": "2026-10-28T18:00:00Z",
  "services": [
    { "id": "database", "state": "ok", "age": 0 },
    { "id": "worker", "state": "ok", "age": 41 }
  ]
}

• state: the worst of the services.
• checked_at: when the summary was built. An answer more than 5 minutes old counts as no answer.
• Each service has an id, a state (ok, degraded or down) and an age: seconds since it last showed it was working, or null when that is not known. Nothing else is reported.

The app reports the database, the background worker, notifications, the EVE API (ESI) as the app sees it, the market sweeps and, when it has push set up, browser push. Any other service id is shown as written; add a label for it in LABELS in status.js.

The market API answers GET /api/market/v1/health with one service, under the same rules:

{ "service": "market_api", "state": "ok", "checked_at": "2026-10-28T18:00:00Z" }

ESI's GET /latest/status/ is EVE Online's own: the page shows Tranquility as working with its player count, or degraded while it is in VIP mode.

Deploying on Cloudflare Pages

1. In the Cloudflare dashboard, open Workers & Pages, choose Create, then Pages, then Connect to Git, and pick this repository.
2. Set the build settings:
   • Framework preset: None
   • Build command: leave empty
   • Build output directory: / (the repository root)
3. Save and deploy. Every push to the main branch deploys again.
4. Optional: under Custom domains, add a domain such as status.evesynapse.app.

Choosing the servers

config.js lists the sources, each with a name, its public address (scheme and host only) and a kind (summary, the default, for an EveSynapse /status.json; single for one service's health at path; esi for ESI). When you add, remove or change an address, change two places in the same commit:

• the sources list in config.js;
• connect-src in the Content-Security-Policy meta tag in index.html. The browser blocks a check to any address not listed there.

Letting each server answer the page

A server only lets one other site's pages read its /status.json. On the EveSynapse app, set the page's address, scheme and host only, and restart:

STATUS_PAGE_ORIGIN=https://status.evesynapse.app

Use the Pages address (https://<project>.pages.dev) if there is no custom domain. The market API reads the same STATUS_PAGE_ORIGIN, so one value covers both. Without it the page reports those sources as unreachable even while they are up. ESI allows any origin and needs nothing.

The market API host

The market API is served by the same app on its own host name:

• Set MARKET_API_HOST on the app to that host name, for example MARKET_API_HOST=api.evesynapse.app. On that host only /api/ paths answer.
• Give the host its own DNS record, or its own Cloudflare tunnel route, pointing at the same app.
• Keep the Market API url in config.js and connect-src in index.html on that same host.

Trying it locally

Serve the folder with any static file server and open it. For a local server, point a source and connect-src at its address (for example http://127.0.0.1:8080), serve this page on another port, and start the server with STATUS_PAGE_ORIGIN set to this page's address.