Header category
Conditional Requests & Concurrency
Headers that make a request conditional on the state of a resource — the difference between a safe update and a lost one.
13 headers
368 provider declarations
| Header | Providers | Status | |
|---|---|---|---|
| ETag | 125 | permanent | regulated |
| If-None-Match | 76 | permanent | |
| If-Match | 76 | permanent | regulated |
| If-Modified-Since | 52 | permanent | |
| Last-Modified | 29 | permanent | |
| If-Unmodified-Since | 10 | permanent | |
| Schedule-Tag | — | permanent | |
| OData-Isolation | — | permanent | |
| Isolation | — | provisional | |
| If-Schedule-Tag-Match | — | permanent | |
| If-Range | — | permanent | |
| If | — | permanent | |
| Set-Txn | — | permanent |
All categories
Authentication Authorization & Scope Caching Conditional Requests & Concurrency Content Negotiation Representation Metadata Connection & Transport CORS Security Policy Privacy & Consent Rate Limiting & Quota Tracing & Correlation Idempotency & Reliability Versioning & Lifecycle Integrity & Signing Async & Long-Running Cost & Metering Agent & Bot Identity