HTTP header analysis for https://gravatar.com/mratweb011

HTTP Headers Analyzer

6 / 10

https://gravatar.com/mratweb011

WordPress → Nginx → Browser
6 missing headers, 1 warnings, 3 notices

Value

Explanation

nginx

tue, 24 feb 2026 06:31:00 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.

text/html; charset=utf-8

The type of the message body, specified as a MIME type.

accept-encoding

The 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.

Specifies the page's intended audience. For example, en-US means that the document is intended for English language speakers in the United States. The language tags are defined in RFC 5646.

cp="cao psa"

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.

wed, 11 jan 1984 05:00:00 gmt

This Expires date is in the past: the page is considered stale and will be removed from all caches.
Notice Because there is a Cache-Control header with a max-age and/or s-maxage directive, the Expires header will be ignored. Consider removing Expires to save bandwidth and processing power.

no-cache, must-revalidate, max-age=0

no-cache means the response can be stored by any cache, but the stored response must be validated with the origin server before each reuse. If the origin confirms that the response hasn't changed, downloading of the full response body can be skipped.
Warning no-cache will cause a revalidation request to the origin server for every use of the cached response. Consider using public with appropriate max-age to improve caching efficiency.
max-age=0 with must-revalidate means caching is disabled and all requests must be validated with the origin server.
Notice It does not make sense to set must-revalidate with no-cache; must-revalidate is implied.

sameorigin

X-Frame-Options prevents this URL from being embedded in an iframe. This protects against clickjacking attacks.
sameorigin means that this page can be displayed in a iframe, but only on the currrent origin. It can't be displayed on another domain. Consider setting this to deny for added security.

default-src gravatar.com *.gravatar.com; script-src gravatar.com *.gravatar.com *.wp.com *.google-analytics.com *.googletagmanager.com *.facebook.net apis.google.com/js/ 'nonce-ab70cd706d35' 'nonce-937b37448dbf' telegram.org/js/; style-src 'self' gravatar.com *.gravatar.com *.wp.com fonts.googleapis.com 'nonce-937b37448dbf' 'nonce-8e4fdfa53525' 'sha256-ne3gbssvg0idyinkoxv7ohdjod1hojpoczqds8lzvuc=' 'sha256-bilfinpqymtwhmxfka1bpecy0/fnt46saz+bbk5yuog=' 'sha256-ona8dqqhbtsirzzu3/jzyrdknkkageu74eh252dbgs8=' 'sha256-uyx4ryugsgdahnaiid0ihtdpigbkkbfnzg2/h0ewhqk=' 'sha256-47deqpj8hbsa+/timw+5jceuqerkm5nmpjwzg3hsufu=' 'sha256-xi7iu5tcqjkb4mlu0fhpayfwwcetn5knh3gpa4coh4m=' 'sha256-47deqpj8hbsa+/timw+5jceuqerkm5nmpjwzg3hsufu=' 'sha256-i2bauuyp+vemzhandakljot3kejd5culwoznj5urcyc=' 'sha256-fw2rk+yprih15zbxuaaoqav98zs+olax6wdq2akaeho=' 'sha256-t9/679cryrva6r3jgaazco+diam/7wln6kxjhjuozui=' 'sha256-h0rpo0+/l+wc46js6rvm6d3kn9c2lfmai6hxwzvfu2k=' 'sha256-yiktaup7ibrwvksgeomrykaco2jhtw97bhns4onhtiw=' 'sha256-mstzvl0pso46wyzimedzgmr7oqgruy5rpdael19qpbk='; font-src data: gravatar.com *.gravatar.com *.wp.com fonts.gstatic.com; img-src data: https: blob:; media-src https://videos.files.wordpress.com/ s.gravatar.com blob:; frame-src gravatar.com *.gravatar.com automattic.crowdsignal.net widgets.wp.com td.doubleclick.net www.googletagmanager.com oauth.telegram.org; connect-src gravatar.com *.gravatar.com *.wp.com data: blob: *.google-analytics.com *.analytics.google.com analytics.google.com googleadservices.com www.googleadservices.com google.com https://public-api.wordpress.com/ *.pexels.com *.giphy.com *.google.com stats.g.doubleclick.net; object-src 'none'; base-uri 'self'; report-uri https://public-api.wordpress.com/csp/; worker-src 'self' blob:;

The Content Security Policy (CSP) header helps prevent cross-site scripting (XSS), clickjacking, and other code injection attacks by specifying which dynamic resources are allowed to load.
default-src sets the default policy for fetching resources like JavaScript, images, CSS, fonts, AJAX requests, frames, HTML5 media.
script-src specifies valid sources for JavaScript. This includes not only URLs loaded directly into <script> elements, but also things like inline script event handlers (onclick) and XSLT stylesheets which can trigger script execution.
base-uri defines what URLs can be used in the <base> URL.
object-src defines what <object>, <embed> and <applet> elements are allowed to be loaded and executed.
style-src defines what CSS stylesheets are allowed to be loaded.
media-src defines what <audio>, <video> and <track> elements are allowed to be loaded.
img-src defines what images and favicons can be loaded.
worker-src defines what workers scripts (e.g. Worker, ServiceWorker or SharedWorker) can be loaded and executed.
font-src defines what fonts can be loaded using CSS's font-face.
frame-src defines what <frame> and <iframe> elements can be loaded.
report-uri defines the URL that violations will be reported to. While report-uri is officially deprecated in favor of report-to, limited browser support for the latter means report-uri remains a viable option for now.
Notice Consider adding the upgrade-insecure-requests directive to automatically upgrade HTTP requests to HTTPS, helping to prevent mixed content issues.

h3=":443"; ma=86400

The alt-svc header advertises alternative services for accessing the same resource, enabling protocol negotiation and potential performance improvements.
h3 indicates that HTTP/3 is supported. Variants like h3-29 refer to specific drafts of the HTTP/3 protocol.
ma=86400 specifies that the alternative service information is fresh for 86400 seconds.

max-age=31536000; includesubdomains; preload

The Strict-Transport-Security header (HSTS) instructs browsers to only use HTTPS for future connections to this domain, enhancing security by preventing downgrade attacks and cookie hijacking.
max-age specifies the time, in seconds, that the browser should remember to use HTTPS only for this domain.
includesubdomains instructs the browser that all subdomains are HTTPS-only as well.
preload recommends the domain for inclusion in browsers' preload lists. If accepted, the domain would get hardcoded into browsers as HTTPS-only.

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.

missing Add a Permissions-Policy header. Restrict access to device features like the camera, microphone, location, accelerometer and much more.

missing Add a Cross-Origin-Embedder-Policy to specify how this page can be loaded by cross-origin resources.

missing Add a Cross-Origin-Opener-Policy header to opt-in into better browser isolation.

missing Add a Cross-Origin-Resource-Policy header to specify who can load this page.

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.