HTTP Methods Explained for Cron Job Automation

GET — Retrieve Data

Simple Explanation

GET is like asking a question. You send a request to a URL and the server sends back data. Nothing changes on the server — you're just reading information. Every time you open a webpage in your browser, that's a GET request.

Technical Details

• GET requests should never change server state (they are "safe")
• Parameters are sent via URL query strings (e.g., ?page=2&limit=10)
• Responses can be cached by browsers and CDNs
• GET requests have no request body — data goes in the URL
• Defined in RFC 9110 Section 9.3.1

Cron Job Use Cases

Code Examples

curl -X GET "https://api.example.com/health" \
  -H "Accept: application/json" \
  -H "X-Api-Key: your-api-key"

POST — Create or Trigger

Simple Explanation

POST is like filling out a form and clicking "Submit". You're sending information to the server, and the server does something with it — creates a new record, sends an email, triggers a build, or processes a payment.

Technical Details

• POST is NOT idempotent — sending the same request twice may create duplicate resources
• The request body can contain any data format (JSON, XML, form data, binary)
• Content-Type header specifies the body format (e.g., application/json)
• Successful creation typically returns 201 Created
• Defined in RFC 9110 Section 9.3.3

Cron Job Use Cases

Code Examples

curl -X POST "https://api.example.com/reports" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{"type": "monthly", "format": "pdf"}'

PUT — Replace Entirely

Simple Explanation

PUT is like replacing a complete document. You take the old version, throw it away, and put a brand new version in its place. Everything that was in the old version is gone — only what you send in the new version remains.

Technical Details

• PUT replaces the ENTIRE resource — omitted fields may be deleted
• PUT is idempotent — sending the same PUT request multiple times has the same effect
• If the resource doesn't exist, the server may create it (returning 201)
• If the resource exists, the server replaces it (returning 200 or 204)
• Defined in RFC 9110 Section 9.3.4

Cron Job Use Cases

Code Examples

curl -X PUT "https://api.example.com/config/app" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{"theme": "dark", "lang": "en", "notifications": true, "timezone": "UTC"}'

PATCH — Partial Update

Simple Explanation

PATCH is like correcting a typo in a document. You don't rewrite the entire document — you just fix the specific part that needs changing. Everything else stays exactly as it was.

Technical Details

• PATCH sends only the fields that need to change — much smaller payloads than PUT
• PATCH is NOT guaranteed to be idempotent (though many implementations are)
• The server merges the patch with the existing resource
• Common formats: JSON Merge Patch (RFC 7396) or JSON Patch (RFC 6902)
• Defined in RFC 5789

Cron Job Use Cases

Code Examples

curl -X PATCH "https://api.example.com/users/123" \
  -H "Content-Type: application/json" \
  -H "Authorization: Bearer your-token" \
  -d '{"status": "active", "lastSeen": "2026-03-10T12:00:00Z"}'

DELETE — Remove Resource

Simple Explanation

DELETE is like throwing a document in the trash. You're telling the server to remove something permanently. After deletion, that resource no longer exists.

Technical Details

• DELETE is idempotent — deleting an already-deleted resource still succeeds (or returns 404)
• Typically returns 200 (with body), 202 (accepted for later), or 204 (no content)
• DELETE requests usually have no body, though some APIs accept filter parameters
• Some APIs use "soft delete" — marking as deleted rather than removing
• Defined in RFC 9110 Section 9.3.5

Cron Job Use Cases

Code Examples

curl -X DELETE "https://api.example.com/logs?older_than=30d" \
  -H "Authorization: Bearer your-token"

HEAD — Headers Only

Simple Explanation

HEAD is like calling a restaurant to ask if they're open — you don't need to see the menu, you just want a yes or no. The server responds with status and headers but skips sending the actual content, making it much faster.

Technical Details

• HEAD returns the same headers as GET — but with no response body
• HEAD is safe and idempotent — perfect for automated monitoring
• Use it to check Content-Length (file size), Last-Modified (freshness), or Content-Type
• HEAD uses significantly less bandwidth than GET — ideal for high-frequency checks
• Defined in RFC 9110 Section 9.3.2

Cron Job Use Cases

Code Examples

curl -I "https://example.com/api/health" \
  -H "X-Api-Key: your-api-key"

HTTP Methods at a Glance

Quick reference comparing all six HTTP methods.

Which HTTP Method Should I Use?

Answer the question that matches your scenario:

HTTP Status Codes Every Cron Job Should Handle

When your cron job makes an HTTP request, the server responds with a status code. Here's what they mean and whether you should retry.

Security Best Practices for Automated HTTP Requests

Authentication Methods

HMAC Webhook Signatures

CronJobPro signs every outgoing request with an HMAC-SHA256 signature in the X-CronJobPro-Signature header. The format is t=timestamp,v1=signature — similar to Stripe's webhook signing. Your endpoint can verify the signature to ensure the request genuinely came from CronJobPro.

Common Security Mistakes

Error Handling & Retry Strategies

When to Retry

Retry Strategies

CronJobPro supports three retry strategies:

Circuit Breaker Pattern

When a cron job fails repeatedly, something is likely wrong with the target endpoint. CronJobPro's circuit breaker automatically pauses the job after a configurable number of consecutive failures (default: 5). This prevents wasting resources on a broken endpoint and protects the target server from being hammered. You'll receive an alert, and can resume the job once the issue is fixed.