Paste the OPTIONS request and the response headers of a CORS preflight and walk every rule the browser applies, in order, each with a pass or fail and the reason - including the wildcard origin with credentials that is invalid no matter what else the response says.
Paste the OPTIONS request and the response headers of a CORS preflight and get every rule the browser applies, in order, each with a pass or fail and the reason. Covers the wildcard-origin-with-credentials case that is invalid no matter what else the response says, wildcard headers, the explicit credential opt-in, and the private-network preflight. RULE BY RULE WILDCARD TRAP PREFLIGHT
Mask, wildcard, network and broadcast addresses, first and last usable host, and how many hosts a prefix really gives you.
Write a correct robots.txt with your sitemap attached, and optionally block AI training crawlers by name.
How long a transfer really takes, and what upload speed a video call actually needs.
See whether a site actually has a working favicon, and what format the icon really is.
A single-column print-ready resume that renders as you type, with skill proficiency bars, bullet achievements and a copy-as-text version.
Mifflin-St Jeor BMR for men and women, the six real activity multipliers, TDEE as BMR times the multiplier, then a lose-500 / maintain / gain-300 goal.
Look at any image or colour through protanopia, deuteranopia, tritanopia or achromatopsia, with a severity dial and a side-by-side split view.
Latitude, day of the year and the sunrise and sunset you read off a clock, turned into day length, solar noon, noon sun elevation and solar declination, each checked against the NOAA solar-position series.