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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. Water softening - Wikipedia

    en.wikipedia.org/wiki/Water_softening

    Water softening is the removal of calcium, magnesium, and certain other metal cations in hard water. The resulting soft water requires less soap for the same cleaning effort, as soap is not wasted bonding with calcium ions. Soft water also extends the lifetime of plumbing by reducing or eliminating scale build-up in pipes and fittings.

  4. Sears - Wikipedia

    en.wikipedia.org/wiki/Sears

    Sears, Roebuck and Co. (/ s ɪər z / SEERZ), [5] commonly known as Sears, is an American chain of department stores founded in 1892 by Richard Warren Sears and Alvah Curtis Roebuck and reincorporated in 1906 by Richard Sears and Julius Rosenwald, with what began as a mail ordering catalog company migrating to opening retail locations in 1925, the first in Chicago. [6]

  5. Error correction code - Wikipedia

    en.wikipedia.org/wiki/Error_correction_code

    Low-density parity-check (LDPC) codes are a class of highly efficient linear block codes made from many single parity check (SPC) codes. They can provide performance very close to the channel capacity (the theoretical maximum) using an iterated soft-decision decoding approach, at linear time complexity in terms of their block length.

  6. HTTP 403 - Wikipedia

    en.wikipedia.org/wiki/HTTP_403

    A 403 status code can occur for the following reasons: [4] Insufficient permissions: The most common reason for a 403 status code is that the user lacks the necessary permissions to access the requested resource.

  7. HTTP 404 - Wikipedia

    en.wikipedia.org/wiki/HTTP_404

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  8. HTTP 502 - Wikipedia

    en.wikipedia.org/wiki/HTTP_502

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  9. Error code - Wikipedia

    en.wikipedia.org/wiki/Error_code

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