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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    This is a list of Hypertext Transfer Protocol (HTTP) response status codes. Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the HTTP. The first digit of the status ...

  3. reCAPTCHA - Wikipedia

    en.wikipedia.org/wiki/ReCAPTCHA

    In 2013, reCAPTCHA began implementing behavioral analysis of the browser's interactions to predict whether the user was a human or a bot. The following year, Google began to deploy a new reCAPTCHA API, featuring the "no CAPTCHA reCAPTCHA"—where users deemed to be of low risk only need to click a single checkbox to verify their identity. A ...

  4. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

    According to the specification, the 502 status code indicates that the server, while acting as a gateway or proxy, received an invalid response from an upstream server. The Occurrence [ edit ]

  5. CAPTCHA - Wikipedia

    en.wikipedia.org/wiki/Captcha

    This CAPTCHA (reCAPTCHA v1) of "smwm" obscures its message from computer interpretation by twisting the letters and adding a slight background color gradient.A CAPTCHA (/ ˈ k æ p. tʃ ə / KAP-chə) is a type of challenge–response test used in computing to determine whether the user is human in order to deter bot attacks and spam.

  6. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Google Chrome included similar functionality, where the 404 is replaced with alternative suggestions generated by Google algorithms, if the page is under 512 bytes in size. [11] Another problem is that if the page does not provide a favicon , and a separate custom 404-page exists, extra traffic and longer loading times will be generated on ...

  7. HTTP - Wikipedia

    en.wikipedia.org/wiki/HTTP

    Each response header field has a defined meaning which can be further refined by the semantics of the request method or response status code. HTTP/1.1 example of request / response transaction Below is a sample HTTP transaction between an HTTP/1.1 client and an HTTP/1.1 server running on www.example.com , port 80.

  8. HTTP 403 - Wikipedia

    en.wikipedia.org/wiki/HTTP_403

    This can be due to a misconfiguration or intentional restrictions imposed by the server administrator. Blocked by firewall or security software: A 403 status code can occur if a firewall or security software blocks access to the resource. This may happen due to security policies, malware detection, or other security measures.

  9. List of FTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_FTP_server_return...

    Directory status. 213: File status. 214: Help message. Explains how to use the server or the meaning of a particular non-standard command. This reply is useful only to the human user. 215: NAME system type. Where NAME is an official system name from the registry kept by IANA. 220: Service ready for new user. 221: Service closing control connection.

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