文章介绍了ruby中的异常类的结构，介绍了常见的网络异常，常见的网络错误码
异常类的结构：
Object Exception (Interrupt) (ruby 1.7 特性 version 1.6以前的位置) NoMemoryError scrīptError LoadError (NameError) (ruby 1.7 特性 version 1.6以前的位置) NotImplementedError SyntaxError SignalException Interrupt (ruby 1.7 特性) StandardError ArgumentError IndexError KeyError (ruby 1.9 特性) IOError EOFError LocalJumpError NameError (ruby 1.7 特性) NoMethodError (ruby 1.7 特性) RangeError FloatDomainError RegexpError RuntimeError SecurityError SystemCallError Errno::EXXX SystemStackError ThreadError TypeError ZeroDivisionError SystemExit fatal
net/http中的error类：
#http.rb 里的 class HTTPBadResponse < StandardError; end class HTTPHeaderSyntaxError < StandardError; end #protocol.rb 里的 class ProtocolError < StandardError; end class ProtoSyntaxError < ProtocolError; end class ProtoFatalError < ProtocolError; end class ProtoUnknownError < ProtocolError; end class ProtoServerError < ProtocolError; end class ProtoAuthError < ProtocolError; end class ProtoCommandError < ProtocolError; end class ProtoRetriableError < ProtocolError; end ProtocRetryError = ProtoRetriableError
http错误码：
HTTPResponse
HTTPUnknownResponse
HTTPInformation # 1xx
HTTPContinue # 100
HTTPSwitchProtocol # 101
HTTPSuccess # 2xx
HTTPOK # 200
HTTPCreated # 201
HTTPAccepted # 202
HTTPNonAuthoritativeInformation # 203
HTTPNoContent # 204
HTTPResetContent # 205
HTTPPartialContent # 206
HTTPRedirection # 3xx
HTTPMultipleChoice # 300
HTTPMovedPermanently # 301
HTTPFound # 302
HTTPSeeOther # 303
HTTPNotModified # 304
HTTPUseProxy # 305
HTTPTemporaryRedirect # 307
HTTPClientError # 4xx
HTTPBadRequest # 400
HTTPUnauthorized # 401
HTTPPaymentRequired # 402
HTTPForbidden # 403
HTTPNotFound # 404
HTTPMethodNotAllowed # 405
HTTPNotAcceptable # 406
HTTPProxyAuthenticationRequired # 407
HTTPRequestTimeOut # 408
HTTPConflict # 409
HTTPGone # 410
HTTPLengthRequired # 411
HTTPPreconditionFailed # 412
HTTPRequestEntityTooLarge # 413
HTTPRequestURITooLong # 414
HTTPUnsupportedMediaType # 415
HTTPRequestedRangeNotSatisfiable # 416
HTTPExpectationFailed # 417
HTTPServerError # 5xx
HTTPInternalServerError # 500
HTTPNotImplemented # 501
HTTPBadGateway # 502
HTTPServiceUnavailable # 503
HTTPGatewayTimeOut # 504
HTTPVersionNotSupported # 505