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  2. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    An expansion of the 400 Bad Request response code, used when a client certificate is required but not provided. 497 HTTP Request Sent to HTTPS Port. An expansion of the 400 Bad Request response code, used when the client has made a HTTP request to a port listening for HTTPS requests. 499 Client Closed Request.

  3. List of SIP response codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SIP_response_codes

    Extended search being performed may take a significant time so a forking proxy must send a 100 Trying response. [1] : §21.1.1. 180 Ringing. Destination user agent received INVITE, and is alerting user of call. [1] : §21.1.2. 181 Call is Being Forwarded. Servers can optionally send this response to indicate a call is being forwarded. [1 ...

  4. List of FTP server return codes - Wikipedia

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

    List of FTP server return codes. FTP server return codes always have three digits, and each digit has a special meaning. [1] The first digit denotes whether the response is good, bad or incomplete: Range. Purpose. 1xx. Positive Preliminary reply. The requested action is being initiated; expect another reply before proceeding with a new command ...

  5. List of SMTP server return codes - Wikipedia

    en.wikipedia.org/wiki/List_of_SMTP_server_return...

    X.2.XXX Mailbox Status. X.3.XXX Mail System Status. X.4.XXX Network and Routing Status. X.5.XXX Mail Delivery Protocol Status. X.6.XXX Message Content or Media Status. X.7.XXX Security or Policy Status. The meaning of the "detail" field depends on the class and the subject, and are listed in RFC 3463 and RFC 5248 .

  6. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    Since then, 404 errors have become one of the most common and recognizable errors on the Web. Many websites have customized their 404 pages with creative designs, messages, or features to entertain or assist their visitors.

  7. Trial and error - Wikipedia

    en.wikipedia.org/wiki/Trial_and_error

    a serial-test of switches, holding on to the partial successes (assuming that these are manifest), which would take 500 seconds on average parallel-but-individual testing of all switches simultaneously, which would take only one second

  8. Margin of error - Wikipedia

    en.wikipedia.org/wiki/Margin_of_error

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Donate; Pages for logged out editors learn more

  9. Estimated sign - Wikipedia

    en.wikipedia.org/wiki/Estimated_sign

    Estimated sign. The estimated sign, ℮, also referred to as the e-mark or quantité estimée ( estimated quantity) can be found on most prepacked products in the European Union (EU). Its use indicates that the prepackage fulfils EU Directive 76/211/EEC, which specifies the maximum permitted tolerances in package content.