Example Notes / A small technical notebook
Small details.
Useful answers.
A reference shelf for the everyday web: HTTP responses, time formats, and little tools that do one thing well.
01
Field notes
Networking / Quick reference
What did the server say?
An HTTP status describes the result of a request, not necessarily the health of the whole application. Start with the code, then read the response.
| Code | Meaning |
|---|
| 200 | OKThe request succeeded. |
| 301 | Moved PermanentlyUse the URL in the Location header. |
| 304 | Not ModifiedReuse the cached representation. |
| 400 | Bad RequestCheck the request syntax and parameters. |
| 401 | UnauthorizedValid authentication credentials are needed. |
| 403 | ForbiddenThe server refuses to allow this request. |
| 404 | Not FoundNo representation was found, or disclosed. |
| 429 | Too Many RequestsSlow down; check for a Retry-After header. |
| 502 | Bad GatewayA gateway received an invalid upstream response. |
| 503 | Service UnavailableThe service cannot handle the request right now. |
Time / Practical conventions
One instant, several formats.
A timestamp only becomes useful when its unit and time zone are clear. Keep machine-readable values explicit; format for people at the edge.
- Unix timestamp · seconds
- Seconds since 1970-01-01 00:00:00 UTC, ignoring leap seconds.
1704067200
- JavaScript timestamp · milliseconds
- The same instant, with a different unit. JavaScript Date uses milliseconds.
1704067200000
- ISO 8601 · explicit UTC
- The trailing Z means UTC, not your computer's local time.
2024-01-01T00:00:00Z
- ISO 8601 · explicit offset
- This is still the same instant, expressed three hours ahead of UTC.
2024-01-01T03:00:00+03:00
Avoid ambiguous dates such as 01/02/2024. For logs and data exchange, include the year, month, day, and a time-zone designator.
Try the timestamp converter →
03 / Colophon
Less, but useful.
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