HTTP Headers Analyzer
7 / 10
https://www.pearltrees.com/drstep1234/item633964874
Website → Apache → Browser9 missing headers, 0 warnings, 1 notices
Header
Value
Explanation
date
wed, 22 jan 2025 14:44:04 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
.server
apache
p3p
policyref="/w3c/p3p.xml", cp="noi dsp cor nid cura our nor nav"
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.vary
user-agent,accept-encoding
The
Notice Varying on
Vary
header specifies a list of headers that must be considered when caching responses. For a cached response to be used, these headers must match between the cached response and the new request. This ensures that the appropriate version of a resource is served based on factors like language, encoding, or device type.Notice Varying on
user-agent
can lead to low cache efficiency due to the high number of unique user agents. Only use this if you're serving significantly different content based on user agent.set-cookie
pearltreessession=4d403812e40e6558; path=/
A cookie that was sent from the server to the browser.
path=
indicates the path that must exist in the requested URL for the browser to send the cookie.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.