Dries Buytaert

HTTP Headers Analyzer

6 / 10
https://www.bitsdujour.com/profiles/HhL8qG
Website → Browser
10 missing headers, 1 warnings, 1 notices
Header
Value
Explanation
cache-control
private
private means the response can only be stored by the browser's cache, but not by CDNs, proxies, or any other shared caches.
content-length
346502
The size of the message body, in bytes.
content-type
text/html; charset=utf-8
The type of the message body, specified as a MIME type.
expires
mon, 10 mar 2025 11:18:27 gmt
This Expires date is in the past: the page is considered stale and will be removed from all caches.
missing The Cache-Control header, introduced in HTTP/1.1, supersedes the Expires header. Use a Cache-Control header with a max-age directive instead of Expires. Cache-Control is more powerful, but also more efficient in that it avoids roundtrips to the origin server.
server
microsoft-iis/10.0
p3p
cp="iva con our ind dsp idc cor"
P3P stands for Platform for Privacy Preferences. It is used to specify a privacy policy in a machine-readable way. The privacy policy is described in a compact format using tokens. A browser can use the information to inform readers about the website's privacy practices. Unfortunately, it is not well supported by current browsers.
x-aspnet-version
4.0.30319
Some of the software used to generate or serve this page.
Warning Sharing too many details about a server or web application makes it easier for hackers to target a website. Avoid specific version numbers such as 4.0.30319, especially when running software that is end-of-life and/or has known security bugs. Consider removing this header. At a miminum, remove any version number.
x-powered-by
asp.net
Some of the software used to generate or serve this page.
date
tue, 11 mar 2025 11:18:26 gmt
The date and time at which the request was made. A browser uses it for age calculations rather than using its own internal date and time; e.g. when comparing against Max-Age or Expires.
strict-transport-security
missing Add a Strict-Transport-Security header. The Strict-Transport-Security header or HSTS header is used to instruct browsers to only use HTTPS, instead of using HTTP. It helps enforce secure communication.
content-security-policy
missing Add a Content-Security-Policy header. The Content-Security-Policy header helps browsers prevent cross site scripting (XSS) and data injection attacks.
referrer-policy
missing Add a Referrer-Policy header. When a visitor navigates from one page to another, browsers often pass along referrer information. The Referrer-Policy header controls how much referrer information a browser can share. This is important to configure when private information is embedded in the path or query string and passed onto an external destination.
permissions-policy
missing Add a Permissions-Policy header. Restrict access to device features like the camera, microphone, location, accelerometer and much more.
cross-origin-embedder-policy
missing Add a Cross-Origin-Embedder-Policy to specify how this page can be loaded by cross-origin resources.
cross-origin-opener-policy
missing Add a Cross-Origin-Opener-Policy header to opt-in into better browser isolation.
cross-origin-resource-policy
missing Add a Cross-Origin-Resource-Policy header to specify who can load this page.
x-frame-options
missing Add a X-Frame-Options header. The X-Frame-Options header prevents this URL from being embedded in an iframe. This protects against clickjacking attacks. Alternatively, set a Content-Security-Policy header with a frame-ancestor directive.
x-permitted-cross-domain-policies
missing Add a X-Permitted-Cross-Domain-Policies header to prevent Flash, Adobe Reader and other clients from sharing data across domains.

Questions or feedback? Email dries@buytaert.net.