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Web Application Firewall

The Firewall is an ordered list of rules that run for every request matching a route in the project. Each rule has an expression and an action — block, log, or allow.

NoteThe Firewall is currently in preview and rolls out per location. The console shows a “Preview” badge in the sidebar when it’s available.

The Firewall page#

The Firewall tab lists every zone in the project (one per location), with its status, description, rule count, and a 24-hour match sparkline so you can see how busy each rule has been.

console.deploys.app/waf?project=acme
Firewall list showing a single active zone with 3 rules and 431 matches in 24h
A single firewall zone in gke.cluster-rcf2 — 3 rules, 431 matches in the last day.

Click Manage to view, edit, and reorder the zone’s rules.

How rules work#

Rules evaluate in priority order — lowest priority number first. The first rule whose expression matches the request decides the outcome:

ActionEffect
blockReturn the configured status (default 403) and stop. The request never reaches your deployment.
logRecord a match in metrics and continue evaluating later rules.
allowStop evaluating and forward the request to the deployment, bypassing later rules.

A request that doesn’t match any rule is forwarded normally.

{
  "id": "block-admin",
  "description": "Block external access to /admin",
  "expression": "request.path.startsWith('/admin')",
  "action": "block",
  "status": 403,
  "message": "Forbidden",
  "priority": 10
}

The expression language#

Rule expressions are small boolean expressions over the request. Common references:

  • request.path — the URL path (string).
  • request.method — GET, POST, …
  • request.ip — the client IP as seen by the gateway.
  • request.headers['name'] — a header value (string), lowercased name.
  • request.host — the request hostname.

Operators: ==, !=, &&, ||, !, plus the string helpers .startsWith(s), .endsWith(s), and .contains(s).

request.path.startsWith('/admin')
request.headers['user-agent'].contains('bot')
request.ip == '203.0.113.7'
request.path.endsWith('.php') && !request.headers['x-internal'].contains('yes')

Patterns#

Always allow your own egress IPs. Stick an allow rule with low priority at the top of the zone so good traffic short-circuits the rest of the rules.

priority 10 — allow — request.ip == '203.0.113.7'
priority 50 — block — request.path.startsWith('/admin')
priority 90 — log   — request.headers['user-agent'].contains('bot')

Roll out new blocks safely. Add a rule as log first, watch the matches on the metrics page for a day, then flip it to block once you’ve confirmed it’s catching what you expect (and not what you don’t).

Metrics#

The Firewall metrics page plots matches per (rule, action) over a selectable window — 1h, 6h, 12h, 1d, 7d, 30d — so you can see which rules are hot and catch rule changes that suddenly start matching production traffic.

The same data is available via the API:

curl https://api.deploys.app/waf.metrics \
  -H "Authorization: Bearer $DEPLOYS_TOKEN" \
  -d '{ "project": "acme", "location": "gke.cluster-rcf2",
        "timeRange": "1d" }'
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