Dries Buytaert

HTTP Headers Analyzer

5 / 10
WordPress → CloudFlare → Browser
8 missing headers, 2 warnings, 0 notices
Header
Value
Explanation
date
mon, 05 dec 2022 08:14:29 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 compairing against Max-Age or Expires.
content-type
text/html; charset=utf-8
The type of the message body, specified as a MIME type.
connection
keep-alive
Specifies whether the network connection stays open after the current request. keep-alive specifies that the browser would like to keep the connection open, while close indicates that the browser wants to close the connection.
referrer-policy
When a visitor navigates from one page to another page, browsers often pass along referrer information. The Referrer-Policy header controls how much referrer information a browser can share. This is important because private information can be embedded in the path or query string.
Warning The value of this header is not valid.
cf-cache-status
dynamic
Warning dynamic means that Cloudflare did not cache the HTML page. It's equivalent to a cache miss. Cloudflare's dynamic cache setting only caches static assets like images, videos, CSS files, JavaScript files and more. HTML pages will never be cached and will always be requested from the origin web server. This can be expensive for dynamically generated HTML. To cache HTML files in Cloudflare, change the 'Cache level' setting from dynamic to everything.
report-to
{"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=bbov%2bvvs%2bl6piszmudtfyda0i5n8fydeityxdkws1qal%2fyceyn7vevs6wfqa1vt1qh4s7m7ahphbqxytmwqzi7mhjsfgvuc0ob3ck6fu9ow896rkujngnanl2xtsh%2b9wfmlducemwhm%3d"}],"group":"cf-nel","max_age":604800}
The Report-To header instructs the browser where to send "Network Error Logging" (NEL) reports to.
group defines the reporting group. Groups allow reports to be grouped logically; e.g. there could be a group for network errors and a second group for browser feature deprecation reports.
max_age defines the number of seconds the browser should remember these settings. Prevents the browser from having to parse the JSON on each request.
endpoints defines one or more URLs where the reports need to be send to. Multiple URLs can be specified for failover and load-balancing. Endpoints can be assigned a weight to distribute load, with each endpoint receiving a specified fraction of the reporting traffic. Endpoints can also be assigned a priority to set up fallback collectors.
nel
{"success_fraction":0,"report_to":"cf-nel","max_age":604800}
The "Network Error Logging" (NEL) header is used to configure network request logging; enables websites and applications to receive reports about failed network fetches from supporting browsers.
report_to defines the reporting group that reports for this NEL policy will be sent to. The reporting group details are specified in the Report-To header.
max_age defines the number of seconds the browser should remember these settings. Prevents the browser from having to parse the JSON on each request.
success_fraction defines the sampling rate that should be applied to reports about successful network requests. Its value must be a number between 0.0 and 1.0: 0 means no successful requests should be reported, and 1 means that every successful request should be reported.
server
cloudflare
Some of the software used to generate or serve this page.
cf-ray
774b54131fc1823c-iad
A unique request ID generated by Cloudflare. Cloudflare's customer support can use this identifier to trace a request through its network.
alt-svc
h3=":443"; ma=86400, h3-29=":443"; ma=86400
Used to promote alternative services through which the same resource can be retrieved.
h3 stands for HTTP/3. The number after the dash indicates the draft; e.g. h3-27 would be draft 27 of the HTTP/3 protocol.
ma is the number of seconds the alternative service is considered fresh.
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.
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.