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plug lib plug conn status.ex
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lib/plug/conn/status.ex 

defmodule Plug.Conn.Status do

  @moduledoc """

  Conveniences for working with status codes.

  """



  statuses = [

    continue: 100,

    switching_protocols: 101,

    processing: 102,

    ok: 200,

    created: 201,

    accepted: 202,

    non_authoritative_information: 203,

    no_content: 204,

    reset_content: 205,

    partial_content: 206,

    multi_status: 207,

    already_reported: 208,

    instance_manipulation_used: 226,

    multiple_choices: 300,

    moved_permanently: 301,

    found: 302,

    see_other: 303,

    not_modified: 304,

    use_proxy: 305,

    reserved: 306,

    temporary_redirect: 307,

    permanent_redirect: 308,

    bad_request: 400,

    unauthorized: 401,

    payment_required: 402,

    forbidden: 403,

    not_found: 404,

    method_not_allowed: 405,

    not_acceptable: 406,

    proxy_authentication_required: 407,

    request_timeout: 408,

    conflict: 409,

    gone: 410,

    length_required: 411,

    precondition_failed: 412,

    request_entity_too_large: 413,

    request_uri_too_long: 414,

    unsupported_media_type: 415,

    requested_range_not_satisfiable: 416,

    expectation_failed: 417,

    im_a_teapot: 418,

    misdirected_request: 421,

    unprocessable_entity: 422,

    locked: 423,

    failed_dependency: 424,

    upgrade_required: 426,

    precondition_required: 428,

    too_many_requests: 429,

    request_header_fields_too_large: 431,

    internal_server_error: 500,

    not_implemented: 501,

    bad_gateway: 502,

    service_unavailable: 503,

    gateway_timeout: 504,

    http_version_not_supported: 505,

    variant_also_negotiates: 506,

    insufficient_storage: 507,

    loop_detected: 508,

    not_extended: 510,

    network_authentication_required: 511

  ]



  doc = Enum.map(statuses, fn {atom, code} ->

    "  * `#{inspect atom}` - #{code}\n"

  end)



  @doc """

  Returns the status code given an integer or a known atom.



  ## Known status codes



  The following status codes can be given as atoms with their

  respective value shown next:



  #{doc}

  """

  @spec code(integer | atom) :: integer

  def code(integer_or_atom)



  def code(integer) when integer in 100..999 do

    integer

  end



  for {atom, code} <- statuses do

    def code(unquote(atom)), do: unquote(code)

  end

end