| title |
API Management gateway runtime limits |
| description |
Include file |
| services |
api-management |
| author |
dlepow |
| ms.service |
azure-api-management |
| ms.topic |
include |
| ms.date |
02/05/2026 |
| ms.author |
danlep |
| ms.custom |
Include file |
| Runtime limit |
Value |
| Concurrent back-end connections1 per HTTP authority |
2,048 |
| Cached response size |
2 MiB |
| Policy document size |
256 KiB |
| Request payload size |
1 GiB |
| Buffered payload size |
2 MiB |
| Request/response payload size in diagnostic logs |
8,192 bytes |
| Request URL size2 |
16,384 bytes |
| Length of URL path segment |
1,024 characters |
| Character length of named value |
4,096 characters |
| Size of request or response body in validate-content policy |
100 KiB |
| Size of API schema used by validation policy |
4 MB |
| Active WebSocket connections per unit3 |
5,000 |
1 Connections are pooled and reused unless explicitly closed by the backend.
2 Includes an up to 2048-bytes long query string.
3 Up to a maximum of 60,000 connections per service instance.