HTTP Headers

Show the HTTP headers for a URL, with a full break-down of details. Will follow redirects.

Summary

Response
200
Total Requests
1
Total Time
293 ms
  • IP
    137.226.203.20
    View Map

  • Timing

    Wait

    0 ms

    DNS

    6 ms

    TCP

    88 ms

    Request

    1 ms

    First Byte

    113 ms

    Download

    0 ms

    Total

    293 ms

  • HTTP Headers

    Server

    nginx/1.29.6

    A name for the server.

    • Server

      nginx

      Description of the server software.

    • Version

      1.29.6

      Version number.

    Date

    Wed, 29 Apr 2026 08:08:42 GMT

    The date and time that the message was sent.

    Content-Type

    text/html; charset=utf-8

    The MIME type of this content.

    • Type

      text/html

    • Description

      HTML file

    • Charset

      utf-8

    Content-Length

    42233(42.2 kB)

    The length of the response body in octets (8-bit bytes).

    Connection

    keep-alive

    Control options for the current connection and list of hop-by-hop response fields.

    keep-alive - The client would like to keep the connection open.

    X-Powered-By

    Express

    The software powering this site.

    Strict-Transport-Security

    max-age=31536000; includeSubDomains

    A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.

    • Max-Age

      31536000 (1 year)

      The time a browser should remember a site can only be accessed with https (seconds).

    • includesubdomains

      max-age applies to subdomains as well.

    Strict-Transport-Security

    max-age=31536000

    A HSTS Policy informing the HTTP client how long to cache the HTTPS only policy and whether this applies to subdomains.

    • Max-Age

      31536000 (1 year)

      The time a browser should remember a site can only be accessed with https (seconds).

    Problems were detected with this header

    • Duplicate header. There is another header with this name and this may cause problems.
    Referrer-Policy

    same-origin

    Controls what referrer information is sent with requests.

    same-origin - Send the full referrer for same origin requests, and nothing for cross-origin.

    Content-Security-Policy

    default-src 'none';base-uri 'self';connect-src 'self' wss://notes.medien.rwth-aachen.de https://vimeo.com/api/v2/video/;font-src 'self';manifest-src 'self';frame-src 'self' https://player.vimeo.com https://www.youtube.com https://gist.github.com *;img-src * data:;script-src https://notes.medien.rwth-aachen.de/build/ https://notes.medien.rwth-aachen.de/js/ https://notes.medien.rwth-aachen.de/config 'unsafe-inline' 'nonce-fe111b57-9e90-4f67-8cd4-fe1ac5b061c3' 'sha256-81acLZNZISnyGYZrSuoYhpzwDTTxi7vC1YM4uNxqWaM=';style-src https://notes.medien.rwth-aachen.de/build/ https://notes.medien.rwth-aachen.de/css/ 'unsafe-inline';object-src * *;form-action 'self';media-src *;upgrade-insecure-requests

    The content security policy allows the server to determine what resources the user is allowed to load.

    • Default-Src

      Fallback for all fetches.

      • 'none'

    • Base-URI

      Define what can be used in the base element.

      • 'self'

    • Connect-Src

      Define sources for script interfaces.

      • 'self'
      • wss://notes.medien.rwth-aachen.de
      • https://vimeo.com/api/v2/video/

    • Font-Src

      Define sources for fonts.

      • 'self'

    • Manifest-Src

      Define sources for manifest files.

      • 'self'

    • Frame-Src

      Define sources for frames.

      • 'self'
      • https://player.vimeo.com
      • https://www.youtube.com
      • https://gist.github.com
      • *

    • Img-Src

      Define sources for images and favicons.

      • *
      • data:

    • Script-Src

      Define sources for JavaScript.

      • https://notes.medien.rwth-aachen.de/build/
      • https://notes.medien.rwth-aachen.de/js/
      • https://notes.medien.rwth-aachen.de/config
      • 'unsafe-inline'
      • 'nonce-fe111b57-9e90-4f67-8cd4-fe1ac5b061c3'
      • 'sha256-81acLZNZISnyGYZrSuoYhpzwDTTxi7vC1YM4uNxqWaM='

    • Style-Src

      Define sources for stylesheets.

      • https://notes.medien.rwth-aachen.de/build/
      • https://notes.medien.rwth-aachen.de/css/
      • 'unsafe-inline'

    • object-src

      Define sources for object, embed, and applet elements.

      Problems were found.

      • Duplicate value detected.
      • *

        Duplicated value.

      • *

        Duplicated value.

    • Form-Action

      Define what can be used as the target for forms.

      • 'self'

    • Media-Src

      Define sources for audio, video, and track elements.

      • *

    • upgrade-insecure-requests

      Treat insecure URLs as though they are secure.

    Hedgedoc-Version

    1.10.8

    Cache-Control

    private

    Inform all caching mechanisms from server to client whether they may cache this object.

    private - May only be stored by a browser cache.

    X-Robots-Tag

    noindex, nofollow

    Specify how the resource is shown in search results.

    • noindex

      Do not show this page in search results.

    • nofollow

      Do not follow links on this page.

    Etag

    W/"a4f9-2JUz9j07fS4PwsJLWRlbZH48kAs"

    An identifier for a specific version of a resource.

    • Validator

      weak

      A weak tag is easier to generate and prevents byte range caching.

    • Tag

      a4f9-2JUz9j07fS4PwsJLWRlbZH48kAs

    Set-Cookie

    connect.sid=s%3A8x-wnO8yZP9gCcJsOE-XN2uCnrFZQaGT.vv7G%2BSyTWf1TA3whYK3YJcPRDT8BdR41lxjcaQFrBgA; Path=/; Expires=Wed, 13 May 2026 08:08:42 GMT; HttpOnly; Secure; SameSite=Lax

    A cookie sent from the server to be set on the client

    • connect.sid

      s%3A8x-wnO8yZP9gCcJsOE-XN2uCnrFZQaGT.vv7G%2BSyTWf1TA3whYK3YJcPRDT8BdR41lxjcaQFrBgA

      Cookie name and value.

    • Path

      /

      The client will only send the cookie when requesting this path, or subdirectories, from the server.

    • Expires

      Wed, 13 May 2026 08:08:42 GMT

      When the cookie should expire.

    • HttpOnly

      Prevents access to the cookie through JavaScript.

    • Secure

      The cookie is only sent when requesting from a https domain.

    • Samesite

      Lax

      Cookie is not sent on cross-site requests but is when following a link to the origin.

    Vary

    Accept-Encoding

    Indicates that different content may be provided to different clients, depending on the vary header.

    • Headers

      • Accept-Encoding