| pass | The URL shouldn't redirect |
| pass | If clients ask for compression, then provide it |
| pass | Don't disable caching with Cache-Control |
| pass | Supply a Date header, to indicate the server time |
| pass | The server clock should be accurate (< 10 minutes difference) |
| pass | Use an Expires header to tell clients how often to poll |
| FAIL | Expiry must be in the future |
| pass | Last-Modified headers tell clients how often content is updated |
| pass | The Last-Modified date must be in the past |
| good | Provide an ETag |
| pass | Provide Last-Modified or ETag, so clients can make conditional requests |
| good | Feed size should be less than 64 KiB |
| FAIL | Conditional requests, using Last-Modified and ETag, save bandwidth and reduce server load |
| good | If-Modified-Since alone should be honoured |
| WARN | If-None-Match alone should be honoured |