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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This class of status code indicates the client must take additional action to complete the request. Many of these status codes are used in URL redirection. [2]A user agent may carry out the additional action with no user interaction only if the method used in the second request is GET or HEAD.

  3. Unreachable code - Wikipedia

    en.wikipedia.org/wiki/Unreachable_code

    As a consequence, err will hold the status of the SHA1 update operation, and signature verification will never fail. [5] Here, the unreachable code is the call to the final function. [6] Applying the Clang compiler with the option -Weverything includes unreachable code analysis, which would trigger an alarm for this code. [6]

  4. List of websites blocked in mainland China - Wikipedia

    en.wikipedia.org/wiki/List_of_websites_blocked...

    Search: Multilingual: 23 to 24 January 2019 [20] Unblocked (Service Not Available, redirects to Chinese version - cn.bing.com) [21] Instagram: Instagram.com: www.Instagram.com: Image Sharing: Multilingual: September 2014–present [22] Blocked WhatsApp: whatsapp.com whatsapp.com Messaging Multilingual September 2017–present [23] Blocked ...

  5. List of miscellaneous fake news websites - Wikipedia

    en.wikipedia.org/wiki/List_of_miscellaneous_fake...

    A WordPress-hosted site that published a false news story, stating that Donald Trump had won the popular vote in the 2016 United States presidential election; the fake story rose to the top in searches for "final election results" on Google News. [8] [9] A Folha Brasil Spoof of Folha de S.Paulo. [10] Afrikan-daily.com Afrikan-daily.com

  6. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    One of the most effective ways to discover 404 errors is by using Google Search Console, Google Analytics or crawling software. Another common method is tracking traffic to 404 pages using log file analysis. [21] This can be useful to understand more about what 404s users reached on the site.

  7. Google Public DNS - Wikipedia

    en.wikipedia.org/wiki/Google_Public_DNS

    Google Public DNS was announced on December 3, 2009, [1] in an effort described as "making the web faster and more secure." [2] [3] As of 2018, it is the largest public DNS service in the world, handling over a trillion queries per day. [4] Google Public DNS is not related to Google Cloud DNS, which is a DNS hosting service.

  8. Black hole (networking) - Wikipedia

    en.wikipedia.org/wiki/Black_hole_(networking)

    The most common form of black hole is simply an IP address that specifies a host machine that is not running or an address to which no host has been assigned.. Even though TCP/IP provides a means of communicating the delivery failure back to the sender via ICMP, traffic destined for such addresses is often just dropped.

  9. HTTP 403 - Wikipedia

    en.wikipedia.org/wiki/HTTP_403

    IP restrictions: The server may also restrict access to specific IP addresses or IP ranges. If the user's IP address is not included in the list of permitted addresses, a 403 status code is returned. Server configuration: The server's configuration can be set to prohibit access to certain files, directories, or areas of the website.