---
title: "larsggu.me"
url: https://larsggu.me/
description: "A vendor-neutral reference for the vocabulary of business software integration over HTTP: delivery, identity, data shape and operations."
---

# larsggu.me

## Selected entries

### [webhook delivery](https://larsggu.me/reference/webhook-delivery)

POST {receiver_url} -> 2xx acknowledgement

An outbound HTTP request a service makes to a customer-supplied URL when an event occurs, replacing the need for the customer to poll for changes.

[Full entry: webhook delivery](https://larsggu.me/reference/webhook-delivery)

### [idempotency key](https://larsggu.me/reference/idempotency-key)

Idempotency-Key: <client-generated unique string>

A caller-supplied identifier that lets a request be repeated safely, because the server records the outcome against the key and replays it instead of acting twice.

[Full entry: idempotency key](https://larsggu.me/reference/idempotency-key)

### [rate limit headers](https://larsggu.me/reference/rate-limit-headers)

RateLimit-Limit / RateLimit-Remaining / RateLimit-Reset / Retry-After

The response headers by which a service tells a caller how much of its quota is left and when it resets, so the caller can pace itself rather than discover the limit by being refused.

[Full entry: rate limit headers](https://larsggu.me/reference/rate-limit-headers)

### [cursor pagination](https://larsggu.me/reference/cursor-pagination)

GET /collection?limit=n[&after=<cursor>] -> {data, next_cursor}

Paging through a collection with an opaque position marker rather than a numeric offset, so that concurrent writes do not cause rows to be skipped or repeated.

[Full entry: cursor pagination](https://larsggu.me/reference/cursor-pagination)

### [error envelope](https://larsggu.me/reference/error-envelope)

{"error":{"type","message","detail","request_id"}}

A single response shape for every failure, so that a caller can write one handler rather than one per endpoint.

[Full entry: error envelope](https://larsggu.me/reference/error-envelope)

### [tenant isolation](https://larsggu.me/reference/tenant-isolation)

every query, key and cache entry carries tenant_id

The guarantee that one customer's data in a shared system cannot be read, written or inferred by another, enforced at the query layer rather than in application logic.

[Full entry: tenant isolation](https://larsggu.me/reference/tenant-isolation)

[The complete index lists all twelve entries alphabetically.](https://larsggu.me/reference)