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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. HTTP - Wikipedia

    en.wikipedia.org/wiki/HTTP

    HTTP functions as a request–response protocol in the client–server model. A web browser, for example, may be the client whereas a process, named web server, running on a computer hosting one or more websites may be the server. The client submits an HTTP request message to the server.

  4. Web server - Wikipedia

    en.wikipedia.org/wiki/Web_server

    This is a very brief history of web server programs, so some information necessarily overlaps with the histories of the web browsers, the World Wide Web and the Internet; therefore, for the sake of clarity and understandability, some key historical information below reported may be similar to that found also in one or more of the above-mentioned history articles.

  5. Fix sending and receiving issues with third-party email apps

    help.aol.com/articles/cant-send-or-receive-email...

    If your account is working on a web browser and you made sure you're using the right server settings, then update your email app to the newest version available. If you're still experiencing issues with your app, contact the manufacturer. Also, access your AOL Mail on a web browser. Keep in mind - For two-step verification, generate an app ...

  6. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    When you get a message from a "MAILER-DAEMON" or a "Mail Delivery Subsystem" with a subject similar to "Failed Delivery," this means that an email you sent was undeliverable and has been bounced back to you.

  7. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

    If the proxy server is unable to satisfy a request for a page because of a problem with the remote host (such as hostname resolution failures or refused TCP connections), this should be described as a 5xx Internal Server Error, but might deliver a 404 instead.

  8. HTTP 403 - Wikipedia

    en.wikipedia.org/wiki/HTTP_403

    HTTP 403 is an HTTP status code meaning access to the requested resource is forbidden. The server understood the request, but will not fulfill it, if it was correct. The server understood the request, but will not fulfill it, if it was correct.

  9. HTTP 402 - Wikipedia

    en.wikipedia.org/wiki/HTTP_402

    The HTTP status code 402 is currently classified as an experimental code within the HTTP protocol. Such experimental codes are introduced to assess new features or ideas and determine their practical application. The designation of the 402 status implies that a payment is mandated to obtain a particular resource or service.