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  2. HTTP persistent connection - Wikipedia

    en.wikipedia.org/wiki/HTTP_persistent_connection

    Under HTTP 1.0, connections should always be closed by the server after sending the response. [1]Since at least late 1995, [2] developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named "keep-alive" in order to allow the reuse of a connection for multiple requests/responses.

  3. List of HTTP status codes - Wikipedia

    en.wikipedia.org/wiki/List_of_HTTP_status_codes

    503 Service Unavailable The server cannot handle the request (because it is overloaded or down for maintenance). Generally, this is a temporary state. [26] 504 Gateway Timeout The server was acting as a gateway or proxy and did not receive a timely response from the upstream server. 505 HTTP Version Not Supported The server does not support the ...

  4. Keepalive - Wikipedia

    en.wikipedia.org/wiki/Keepalive

    Keepalive time is the duration between two keepalive transmissions in idle condition. TCP keepalive period is required to be configurable and by default is set to no less than 2 hours. Keepalive interval is the duration between two successive keepalive retransmissions, if acknowledgement to the previous keepalive transmission is not received.

  5. C10k problem - Wikipedia

    en.wikipedia.org/wiki/C10k_problem

    This can involve a combination of operating system constraints and web server software limitations. According to the scope of services to be made available and the capabilities of the operating system as well as hardware considerations such as multi-processing capabilities, a multi-threading model or a single threading model can be preferred.

  6. Nginx - Wikipedia

    en.wikipedia.org/wiki/Nginx

    Nginx is free and open-source software, released under the terms of the 2-clause BSD license. A large fraction of web servers use Nginx, [10] often as a load balancer. [11] A company of the same name was founded in 2011 to provide support and NGINX Plus paid software. [12] In March 2019, the company was acquired by F5 for $670 million. [13]

  7. Forward secrecy - Wikipedia

    en.wikipedia.org/wiki/Forward_secrecy

    The value of forward secrecy is limited not only by the assumption that an adversary will attack a server by only stealing keys and not modifying the random number generator used by the server but it is also limited by the assumption that the adversary will only passively collect traffic on the communications link and not be active using a man ...

  8. Fix problems reading or receiving AOL Mail

    help.aol.com/articles/fix-problems-reading-or...

    The problem could be caused by server delays due to a lot of people accessing their email at once. Usually this is resolved in just a few minutes. Be aware, if the picture was sent in an unsupported file format, such as TIFF, you may not be able to view it. Ask the sender to resend the picture using JPG or GIF file format. Check the attachments