HTTP:COLON – A quick HTTP header/directive inspector and reference
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,…
HTTP:COLON – A quick HTTP header/directive inspector and reference launched on January 18, 2026 with 37 votes, #601 of 14,585 launches that month and more than 95% of that year's launches.
In plain words
HTTP:COLON is an open-source web tool that inspects HTTP response headers from any URL and explains what they mean. Users enter a domain, select an HTTP method, and see headers organized by category—cache, content, and security—with built-in documentation and tooltips for quick reference while debugging. It supports GET, POST, PUT, and DELETE requests, and allows deep linking directly to specific domains for instant inspection. The tool is designed for developers who need fast answers about HTTP headers without switching between multiple resources.
written from the facts on this page · September 2026
From the sources
HTTP headers are a fundamental component of the HTTP protocol, which is the backbone of the internet. These headers contain important information about the request and response, such as content type, caching instructions, authentication tokens, and more. By understanding how to read and manipulate HTTP headers, developers can optimize their web applications for performance, security, and functionality. Moreover, HTTP headers play a critical role in API integrations, allowing developers to communicate with external services and systems. In short, HTTP headers are an essential tool in the web developer's arsenal, and any developer serious about building high-quality web applications should…from httpcolon.dev
In the maker’s words, at launch
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…
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