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Configure domains, routing, CORS, VPC, static IPs, and inter-service communication for DigitalOcean App Platform. Use when setting up custom domains, subdomain routing, cross-origin API access, or secure database connectivity.
Configure domains, routing, CORS, VPC, static IPs, and inter-service communication for DigitalOcean App Platform. Use when setting up custom domains, subdomain routing, cross-origin API access, or secure database connectivity.
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Configure domains, routing, CORS, VPC, static IPs, and inter-service communication.
What networking do you need?
├── Custom domain?
│ └── YES → See domains-dns.md
│
├── Multiple services on one domain?
│ ├── Different paths (/api, /app) → Path-based routing
│ └── Different subdomains (api.*, app.*) → Subdomain routing
│
├── Frontend calling API across origins?
│ └── YES → CORS configuration
│
├── Secure database connectivity?
│ └── YES → VPC + trusted sources
│
└── Need static outbound IP?
└── YES → Dedicated egress
| Scenario | Need This Skill |
|---|---|
| Starter domain only | No |
| Custom domain | Yes |
| Multiple services, different paths | Yes |
| Multiple subdomains | Yes |
| Cross-subdomain API calls (CORS) | Yes |
| Secure database access via VPC | Yes |
| Firewall allowlisting (egress IP) | Yes |
| Feature | App Spec Field | Example |
|---|---|---|
| Custom domain | domains[].domain | example.com |
| Wildcard | domains[].wildcard | true |
| Path routing | ingress.rules[].match.path.prefix | /api |
| Subdomain routing | ingress.rules[].match.authority.exact | api.example.com |
| CORS | ingress.rules[].cors | See reference |
| VPC | vpc.id | UUID |
| Dedicated egress | egress.type | DEDICATED_IP |
ingress:
rules:
- component: { name: api }
match: { path: { prefix: /api } }
- component: { name: frontend }
match: { path: { prefix: / } }
Rule order matters: Specific rules first.
Full guide: See ingress-routing.md
domains:
- domain: example.com
type: PRIMARY
wildcard: true
zone: example.com
ingress:
rules:
- component: { name: api }
match:
authority: { exact: api.example.com }
path: { prefix: / }
- component: { name: app }
match:
authority: { exact: app.example.com }
path: { prefix: / }
Full guide: See domains-dns.md
ingress:
rules:
- component: { name: api }
match: { path: { prefix: /api } }
cors:
allow_origins:
- exact: https://app.example.com
allow_methods: [GET, POST, PUT, DELETE, OPTIONS]
allow_headers: [Content-Type, Authorization]
allow_credentials: true
Note: With allow_credentials: true, use exact origins only (no regex).
Full guide: See cors-configuration.md
vpc:
id: your-vpc-uuid
VPC CIDR whitelisting (recommended):
doctl vpcs get $VPC_ID --format IPRange # e.g., 10.126.0.0/20
doctl databases firewalls append $CLUSTER_ID --rule ip_addr:10.126.0.0/20
| Setup | Trusted Source Rule |
|---|---|
| Public only | app:$APP_ID |
| VPC enabled | ip_addr:<vpc-cidr> |
Critical: Bindable variables return PUBLIC hostnames even with VPC. Use private URLs:
doctl databases connection --private <cluster-id> --format URI
Full guide: See vpc-trusted-sources.md
| Issue | Fix |
|---|---|
| Domain not resolving | Check DNS records, allow 72h propagation |
| SSL certificate error | Add CAA records for letsencrypt.org + pki.goog |
| CORS preflight fails | Add OPTIONS to allow_methods |
| VPC connection refused | Use VPC CIDR whitelisting, not app-based rules |
| Wrong component serves | Reorder rules (specific first) |
name: app-platform-networking version: 1.0.0 min_doctl_version: "1.82.0" description: Configure domains, routing, CORS, VPC, static IPs, and inter-service communication for DigitalOcean App Platform. Use when setting up custom domains, subdomain routing, cross-origin API access, or secure database connectivity. related_skills: [designer, postgres, managed-db-services] deprecated: false
---
name: app-platform-networking
version: 1.0.0
min_doctl_version: "1.82.0"
description: Configure domains, routing, CORS, VPC, static IPs, and inter-service communication for DigitalOcean App Platform. Use when setting up custom domains, subdomain routing, cross-origin API access, or secure database connectivity.
related_skills: [designer, postgres, managed-db-services]
deprecated: false
---
# App Platform Networking Skill
Configure domains, routing, CORS, VPC, static IPs, and inter-service communication.
## Quick Decision
```
What networking do you need?
├── Custom domain?
│ └── YES → See domains-dns.md
│
├── Multiple services on one domain?
│ ├── Different paths (/api, /app) → Path-based routing
│ └── Different subdomains (api.*, app.*) → Subdomain routing
│
├── Frontend calling API across origins?
│ └── YES → CORS configuration
│
├── Secure database connectivity?
│ └── YES → VPC + trusted sources
│
└── Need static outbound IP?
└── YES → Dedicated egress
```
---
## When to Use
| Scenario | Need This Skill |
|----------|-----------------|
| Starter domain only | No |
| Custom domain | Yes |
| Multiple services, different paths | Yes |
| Multiple subdomains | Yes |
| Cross-subdomain API calls (CORS) | Yes |
| Secure database access via VPC | Yes |
| Firewall allowlisting (egress IP) | Yes |
---
## Quick Reference
| Feature | App Spec Field | Example |
|---------|----------------|---------|
| Custom domain | `domains[].domain` | `example.com` |
| Wildcard | `domains[].wildcard` | `true` |
| Path routing | `ingress.rules[].match.path.prefix` | `/api` |
| Subdomain routing | `ingress.rules[].match.authority.exact` | `api.example.com` |
| CORS | `ingress.rules[].cors` | See reference |
| VPC | `vpc.id` | UUID |
| Dedicated egress | `egress.type` | `DEDICATED_IP` |
---
## Path-Based Routing (Quick Start)
```yaml
ingress:
rules:
- component: { name: api }
match: { path: { prefix: /api } }
- component: { name: frontend }
match: { path: { prefix: / } }
```
**Rule order matters:** Specific rules first.
**Full guide**: See [ingress-routing.md](reference/ingress-routing.md)
---
## Subdomain Routing (Quick Start)
```yaml
domains:
- domain: example.com
type: PRIMARY
wildcard: true
zone: example.com
ingress:
rules:
- component: { name: api }
match:
authority: { exact: api.example.com }
path: { prefix: / }
- component: { name: app }
match:
authority: { exact: app.example.com }
path: { prefix: / }
```
**Full guide**: See [domains-dns.md](reference/domains-dns.md)
---
## CORS (Quick Start)
```yaml
ingress:
rules:
- component: { name: api }
match: { path: { prefix: /api } }
cors:
allow_origins:
- exact: https://app.example.com
allow_methods: [GET, POST, PUT, DELETE, OPTIONS]
allow_headers: [Content-Type, Authorization]
allow_credentials: true
```
**Note:** With `allow_credentials: true`, use exact origins only (no regex).
**Full guide**: See [cors-configuration.md](reference/cors-configuration.md)
---
## VPC + Trusted Sources (Quick Start)
```yaml
vpc:
id: your-vpc-uuid
```
**VPC CIDR whitelisting (recommended):**
```bash
doctl vpcs get $VPC_ID --format IPRange # e.g., 10.126.0.0/20
doctl databases firewalls append $CLUSTER_ID --rule ip_addr:10.126.0.0/20
```
| Setup | Trusted Source Rule |
|-------|---------------------|
| Public only | `app:$APP_ID` |
| VPC enabled | `ip_addr:<vpc-cidr>` |
**Critical:** Bindable variables return PUBLIC hostnames even with VPC. Use private URLs:
```bash
doctl databases connection --private <cluster-id> --format URI
```
**Full guide**: See [vpc-trusted-sources.md](reference/vpc-trusted-sources.md)
---
## Reference Files
- **[domains-dns.md](reference/domains-dns.md)** — Domain types, DNS setup, wildcards, TLS, CAA
- **[ingress-routing.md](reference/ingress-routing.md)** — Path routing, rewrites, redirects, authority matching
- **[cors-configuration.md](reference/cors-configuration.md)** — CORS fields, patterns, credentials
- **[vpc-trusted-sources.md](reference/vpc-trusted-sources.md)** — VPC setup, trusted sources matrix, private URLs
- **[static-ips-egress.md](reference/static-ips-egress.md)** — Ingress IPs, dedicated egress, HTTP/2, internal ports
- **[complete-patterns.md](reference/complete-patterns.md)** — 5 complete architecture patterns
---
## Common Issues
| Issue | Fix |
|-------|-----|
| Domain not resolving | Check DNS records, allow 72h propagation |
| SSL certificate error | Add CAA records for letsencrypt.org + pki.goog |
| CORS preflight fails | Add OPTIONS to allow_methods |
| VPC connection refused | Use VPC CIDR whitelisting, not app-based rules |
| Wrong component serves | Reorder rules (specific first) |
---
## Integration with Other Skills
- **→ designer**: Add domains/ingress to app spec
- **→ troubleshooting**: Debug DNS, CORS, VPC issues
- **→ postgres**: VPC connectivity for managed databases
- **→ deployment**: Deploy networking changes
Skill source recorded
Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.
Review before install: Avoid automatic install
License: MIT
Listed tools are metadata hints, not tested compatibility. Agent prompts are suggested handoffs.
Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.
Version reported in registry metadata; check source releases before relying on it.
Quality
57/100
Promising
Trust
60/100
This page exposes the same decision, trust, audit, use-case, and install signals through the Registry API, so agents can rank this skill without scraping the UI.
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