Protocol tools help when you are staring at curl output, response headers, or network reference tables. Recent batches added header parsers, curl helpers, and HTTP fetch utilities beside the long-standing status-code and MIME reference pages.
curl, fetch, and command translation
- cURL parser — break a copied curl command into method, URL, headers, and body fields.
- curl to HTTPie — rewrite a curl one-liner into http-style syntax for quick retries.
- HTTP fetch — send a GET/HEAD from the browser and inspect status and headers (respect CORS).
Parse response and request headers
- Forwarded header parse, Retry-After parse, and ETag weak/strong parse — split proxy and cache headers from raw traces.
- WWW-Authenticate parse and Cookie parse — decode 401 challenges and Set-Cookie shapes locally.
- HTTP headers reference — filterable field names when you need a reminder, not a parser.
IP, DNS, and reference tables
- CIDR calculator, IPv4 subnet table, and IPv6 expand & compress — prefix math without a CLI.
- MAC / EUI formatter, IPv4 converter, and User-Agent parser — normalize addresses and decode log lines.
- SSL expiry hint — read notAfter from a pasted certificate PEM block (local parse only).
Status codes, MIME, SemVer, and site meta
- HTTP status codes, HTTP methods, and MIME types — searchable reference when debugging APIs.
- SemVer compare, Open Graph preview, and robots.txt generator — release and SEO plumbing beside HTTP work.
For the full debugging map including CIDR and SQL format, see protocol tools for web debugging.