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HTTP 103 Early Hints

The server is sending headers, often Link headers, before the final response. Free reference, no signup.

103 Early Hints

MeaningThe server is sending headers, often Link headers, before the final response.
WhenThe origin wants the browser to preload assets while it still builds the page.
CausesA CDN or app server that supports 103 Early Hints.
FixIgnore it unless preloads are wrong or the final status never arrives.
RetryThere is nothing to retry.
Alert?No. The real status comes later.

Runs in your browser. Nothing you enter is stored.

Most 103s are not an incident

The real status comes later.

curl -sS -X POST https://api.trigv.com/v1/events \
  -H "Content-Type: application/json" \
  -H "Accept: application/json" \
  -H "Authorization: Bearer $TRIGV_API_KEY" \
  -d '{"channel":"ops","title":"HTTP 103","level":"warning"}'
Get an API key All status codes

How to use it

  1. Read what 103 means before changing a retry loop.
  2. Check the common causes against the response body and the server log.
  3. Follow the retry note. Retrying a 400 with the same body will fail again.
  4. Alert only in the cases the verdict describes.

About this tool

HTTP 103 Early Hints means The server is sending headers, often Link headers, before the final response. Servers send it when The origin wants the browser to preload assets while it still builds the page.

Common causes: A CDN or app server that supports 103 Early Hints. The practical fix is: Ignore it unless preloads are wrong or the final status never arrives.

Retry: There is nothing to retry.

Alert on it? No. The real status comes later.

Trigv is a push for the moment a status starts mattering, not a log of every response. If the code is one you should hear about, the snippet posts a single event with level error or warning. The status page itself does not call your API.

Questions

What is HTTP 103?

The server is sending headers, often Link headers, before the final response.

Should the client retry?

There is nothing to retry.

Should I alert on it?

No. The real status comes later.

How is this different from reading the spec?

The page adds a plain retry note and an alert verdict for people running the service, not only for people parsing the response.

100 Continue The server received the request headers and the client should send the body. 101 Switching Protocols The server is switching protocols, usually to WebSocket. Cron Job Alert Script Wrap a command so a failed, slow, or finished cron job sends a Trigv alert.