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.
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.