HTTP 431 header-fields-too-large
Meaning of HTTP 431.
endpoint: https://agent-observatory-sensor.nolimit-observatory.workers.dev/s/http-431/mcp
registry: io.github.sadri-dridi/http-431
A
recent success 100% (30 probes) ·
MCP handshake OK
· protocol 2025-03-26
TLS valid (53d left) · latency 102.0 ms ·
HTTP 200 · auth open ·
tools 31
manifest 52e5e8a98cafa521
· drift events seen here: 4
Embed this grade
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Recent probes
| time (UTC) | ok | grade | mcp | latency | tls | tools | hash |
|---|---|---|---|---|---|---|---|
| 2026-10-12T04:50:55Z | ✓ | A | ✓ | 102.0 ms | 53d | 31 | 52e5e8a98cafa521 |
| 2026-10-11T22:49:49Z | ✓ | A | ✓ | 73.0 ms | 54d | 31 | 52e5e8a98cafa521 |
| 2026-10-11T16:49:16Z | ✓ | A | ✓ | 101.0 ms | 54d | 31 | 52e5e8a98cafa521 |
| 2026-10-11T10:48:10Z | ✓ | A | ✓ | 182.0 ms | 54d | 31 | 52e5e8a98cafa521 |
| 2026-10-11T04:47:04Z | ✓ | A | ✓ | 118.0 ms | 54d | 31 | 52e5e8a98cafa521 |
| 2026-10-10T22:45:34Z | ✓ | A | ✓ | 93.0 ms | 55d | 31 | 52e5e8a98cafa521 |
| 2026-10-10T16:43:40Z | ✓ | A | ✓ | 54.0 ms | 55d | 31 | 52e5e8a98cafa521 |
| 2026-10-10T10:41:46Z | ✓ | A | ✓ | 102.0 ms | 55d | 31 | 52e5e8a98cafa521 |
| 2026-10-10T04:40:41Z | ✓ | A | ✓ | 63.0 ms | 55d | 31 | 52e5e8a98cafa521 |
| 2026-10-09T22:38:37Z | ✓ | A | ✓ | 55.0 ms | 56d | 31 | 52e5e8a98cafa521 |
| 2026-10-09T16:38:04Z | ✓ | A | ✓ | 91.0 ms | 56d | 31 | 52e5e8a98cafa521 |
| 2026-10-09T10:37:33Z | ✓ | A | ✓ | 151.0 ms | 56d | 31 | 52e5e8a98cafa521 |
| 2026-10-09T04:37:18Z | ✓ | A | ✓ | 105.0 ms | 56d | 31 | 52e5e8a98cafa521 |
| 2026-10-08T22:34:08Z | ✓ | A | ✓ | 100.0 ms | 57d | 31 | 52e5e8a98cafa521 |
| 2026-10-08T16:33:39Z | ✓ | A | ✓ | 100.0 ms | 57d | 31 | 52e5e8a98cafa521 |
| 2026-10-08T10:32:26Z | ✓ | A | ✓ | 81.0 ms | 57d | 31 | 52e5e8a98cafa521 |
| 2026-10-08T04:31:44Z | ✓ | A | ✓ | 69.0 ms | 57d | 31 | 52e5e8a98cafa521 |
| 2026-10-07T22:31:00Z | ✓ | A | ✓ | 100.0 ms | 58d | 31 | 52e5e8a98cafa521 |
| 2026-10-07T16:30:45Z | ✓ | A | ✓ | 88.0 ms | 58d | 31 | 52e5e8a98cafa521 |
| 2026-10-07T10:28:31Z | ✓ | A | ✓ | 69.0 ms | 58d | 31 | 52e5e8a98cafa521 |
| 2026-10-07T04:27:25Z | ✓ | A | ✓ | 96.0 ms | 58d | 31 | 52e5e8a98cafa521 |
| 2026-10-06T22:26:18Z | ✓ | A | ✓ | 105.0 ms | 59d | 31 | 52e5e8a98cafa521 |
| 2026-10-06T16:25:46Z | ✓ | A | ✓ | 77.0 ms | 59d | 31 | 52e5e8a98cafa521 |
| 2026-10-06T10:24:05Z | ✓ | A | ✓ | 85.0 ms | 59d | 31 | 52e5e8a98cafa521 |
| 2026-10-06T04:23:26Z | ✓ | A | ✓ | 53.0 ms | 59d | 31 | 52e5e8a98cafa521 |
| 2026-10-05T22:22:01Z | ✓ | A | ✓ | 66.0 ms | 60d | 31 | 52e5e8a98cafa521 |
| 2026-10-05T16:21:41Z | ✓ | A | ✓ | 48.0 ms | 60d | 31 | 52e5e8a98cafa521 |
| 2026-10-05T10:19:46Z | ✓ | A | ✓ | 72.0 ms | 60d | 31 | 52e5e8a98cafa521 |
| 2026-10-05T04:18:42Z | ✓ | A | ✓ | 74.0 ms | 60d | 31 | 52e5e8a98cafa521 |
| 2026-10-04T22:17:37Z | ✓ | A | ✓ | 114.0 ms | 61d | 31 | 52e5e8a98cafa521 |