Look up a status, pick the right one for an API, or hit a live endpoint that actually returns it. Add ?code=418 to this URL and the response is that status — useful for curl, interceptors, and “what does my client do on 503?” Nothing here phones home except the Try it fetch to this same page.
Which class?
The server has received the request headers and the client should send the body.
When to use
Automatic when a client sends Expect: 100-continue with a large body. You almost never return this from application code.
Don’t
Do not use it as a business-level “keep going” signal. Browsers and PHP cannot usefully simulate it.
Live URL
curl -i https://corecoding.com/utilities/http-status.php?code=100
No codes match.
Code use cases