Debug HTTP requests, headers and CORS; parse URLs and XPath; calculate CIDR and validate schemas.
Inspect the components and query parameters of an absolute URL.
Look up the standard meaning of an HTTP response status.
Turn common cURL requests into JavaScript Fetch or Axios code.
Test HTTP APIs directly from the browser.
Check pasted CORS response headers for common preflight and credentialed-request errors.
Turn raw HTTP headers into structured JSON without losing repeated fields.
Create correctly encoded query parameters from structured values.
Create an Authorization header for HTTP Basic authentication.
Look up file extensions and common MIME types.
Convert HTML form request bodies between encoded text and JSON.
Analyze User-Agent strings and generate testing values.
Test XPath expressions against an XML document.
Calculate IPv4 subnet boundaries and usable host counts.