Tools
HTTP Tools
Free interactive tools for learning, building, and debugging HTTP. No sign-up required — everything runs in your browser.
HTTP Playground
Compose requests, inspect responses, explore headers, cookies, and raw HTTP wire format.
Header Inspector
Fetch any URL and analyze its response headers with security grading.
Redirect & Canonical Auditor
Follow redirect chains, inspect canonicals, and catch noindex or indexing conflicts.
CORS Debugger
Simulate cross-origin requests to see if they pass or fail — with preflight visualization.
Cache-Control Builder
Toggle caching directives and get the generated header with plain-English explanation.
Set-Cookie Builder
Compose Set-Cookie headers visually with security attributes and expiry settings.
Status Code Picker
Answer a few questions to find the right HTTP status code for your API response.
HTTP Message Parser
Paste raw HTTP and see it parsed with color coding and hover explanations.
Site Verifier
Scan any URL for SSL/TLS validity, security headers, cookie safety, and caching analysis.
Choose A Starting Workflow
If you are not sure which tool to open first, pick the workflow that matches the problem you are actually trying to solve.
Learn The Wire Format
Start with raw requests and responses, then map each line to the HTTP concepts behind it.
Debug Browser Policy Issues
Use purpose-built flows for CORS, cookies, and security headers instead of guessing from console errors.
Audit A Production URL
Check transport, redirect hops, canonicals, and indexing signals before rollout or migration.
Design Safer Headers
Generate cache and cookie directives with concrete constraints instead of memorizing header syntax.