Hi HN -- I built HTTP:COLON, a small, open-source web tool for quickly checking a site’s HTTP response headers and learning what they mean as you go.
Link: https://httpcolon.dev/
What it does
- Enter a URL and fetch its response headers
- Groups common headers into handy buckets (cache, content, security)
- Includes short docs/tooltips for headers and directives so you can look things up while debugging. I find hovering on highlighted headers quite useful!
Supports different HTTP methods (GET/POST/PUT/DELETE)
Deep links
- You can link directly to a host, e.g. https://httpcolon.dev/www.google.com
(or any domain) to jump straight into inspecting it.
Why I made it
- I kept bouncing between DevTools, MDN, and random blog posts while debugging caching + security headers. I wanted one place that’s quick for “what am I getting back?” and “what does this header/directive do?”
It’s in beta, and I’d love feedback on:
- Missing features you’d want for day-to-day debugging (export/share formats, comparisons, presets, etc.)
Thanks!
Nice one, really helpful!
Minor nit: the input on mobile auto-capitalizes, so a link starts with "Www" which I find mildly annoying. You could force the input field all lowercase with
which tells modern browsers not to do this.thanks!
Heyho. Really nice Work, Love the Design.
Maybe you have an Idea for my Feedback: IT would be cool if i can save my favorites, so i can only come Back and See Always the Same. What do you think?
Good idea, maybe I could simply store this is in the browser's local storage instead of implementing server side state.
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