Programming

Browse 50+ HTTP headers with descriptions and examples, build a security header set visually, parse raw HTTP headers instantly, and generate ready-to-use Apache .htaccess and Nginx config snippets. Reference Security Builder Header Parser Browse and search 50+ HTTP headers grouped by category. Click any header to see its description, common values, and an example. No headers match your search. Select and configure security headers below, then copy the generated snippet for Apache (.htaccess) or Nginx. Content-Security-Policy — Controls allowed resource origins Enable CSP header default-src 'self' 'self' 'unsafe-inline' 'none' * (any) script-src style-src img-src frame-src Strict-Transport-Security — HTTPS enforcement Enable HSTS max-age 30 days (2592000) 6 months (15552000) 1 year (31536000) includeSubDomains preload X-Frame-Options — Clickjacking protection Enable X-Frame-Options Value SAMEORIGIN DENY X-Content-Type-Options — MIME sniffing prevention Enable (always nosniff) Referrer-Policy — Controls referrer info sent Enable Referrer-Policy Policy no-referrer no-referrer-when-downgrade strict-origin-when-cross-origin same-origin origin Permissions-Policy — Browser feature control Enable Permissions-Policy camera=() microphone=() geolocation=() payment=() usb=() Generated Config Apache Nginx Copy Paste raw HTTP response headers below and click Parse to get a formatted, explained breakdown of each header. ...

IP Address Calculator Subnet, CIDR, and network analysis tools — instant results, no server required. ...

Enter any IPv4 address and CIDR prefix (or subnet mask) to instantly calculate the full subnet breakdown — network address, broadcast, usable host range, wildcard mask, and more. IPv4 Subnet Calculator IP Address Subnet Mask Calculate Clear CIDR Prefix Length /0 /32 /24 Subnet Mask Bits Subnet Results Binary View Network bits = green   Host bits = red Common Subnet Reference Table CIDRSubnet MaskHostsWildcard Check your IP → IP Address Info Convert bytes → Byte Converter DNS records → DNS Record Guide ...

Regex Interactive Cheatsheet Click "Try it" on any row to load the pattern into the live tester below. ...

Test regular expressions instantly in your browser. Paste your pattern, choose flags, and see matches highlighted in real time — no sign-up, no server, no external libraries. ...

Enter a regular expression to get an instant visual breakdown of every token, highlight all matches in your test string, and extract capture groups — no sign-up, no server, no external libraries. ...

Bill Details Bill Amount $ Tip Percentage 18% No Tip 15% 18% 20% 25% Number of People Options Round up per-person amount (to nearest dollar) Tip on pre-tax amount (toggle off = tip after tax) Tax Amount ($) $ Custom split (unequal amounts) Calculate Split ...