responce-code 参考

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HTTP_CONTINUE
HTTP_SWITCHING_PROTOCOLS
HTTP_PROCESSING
HTTP_OK
HTTP_CREATED
HTTP_ACCEPTED
HTTP_NON_AUTHORITATIVE
HTTP_NO_CONTENT
HTTP_RESET_CONTENT
HTTP_PARTIAL_CONTENT
HTTP_MULTI_STATUS
HTTP_MULTIPLE_CHOICES
HTTP_MOVED_PERMANENTLY
HTTP_MOVED_TEMPORARILY
HTTP_SEE_OTHER
HTTP_NOT_MODIFIED
HTTP_USE_PROXY
HTTP_TEMPORARY_REDIRECT
HTTP_BAD_REQUEST
HTTP_UNAUTHORIZED
HTTP_PAYMENT_REQUIRED
HTTP_FORBIDDEN
HTTP_NOT_FOUND
HTTP_METHOD_NOT_ALLOWED
HTTP_NOT_ACCEPTABLE
HTTP_PROXY_AUTHENTICATION_REQUIRED
HTTP_REQUEST_TIME_OUT
HTTP_CONFLICT
HTTP_GONE
HTTP_LENGTH_REQUIRED
HTTP_PRECONDITION_FAILED
HTTP_REQUEST_ENTITY_TOO_LARGE
HTTP_REQUEST_URI_TOO_LARGE
HTTP_UNSUPPORTED_MEDIA_TYPE
HTTP_RANGE_NOT_SATISFIABLE
HTTP_EXPECTATION_FAILED
HTTP_UNPROCESSABLE_ENTITY
HTTP_LOCKED
HTTP_FAILED_DEPENDENCY
HTTP_UPGRADE_REQUIRED
HTTP_INTERNAL_SERVER_ERROR
HTTP_NOT_IMPLEMENTED
HTTP_BAD_GATEWAY
HTTP_SERVICE_UNAVAILABLE
HTTP_GATEWAY_TIME_OUT
HTTP_VERSION_NOT_SUPPORTED
HTTP_VARIANT_ALSO_VARIES
HTTP_INSUFFICIENT_STORAGE
HTTP_NOT_EXTENDED

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Restart marker reply.
Service ready in nnn minutes.
Data connection already open; transfer starting.
File status okay; about to open data connection.
Command okay.
Command not implemented, superfluous at this site.
System status, or system help reply.
Directory status.
File status.
Help message.
NAME system type.
Service ready for new user.
Service closing control connection.
Data connection open; no transfer in progress.
Closing data connection.
Entering Passive Mode (h1,h2,h3,h4,p1,p2).
User logged in, proceed.
Requested file action okay, completed.
"PATHNAME" created.
User name okay, need password.
Need account for login.
Requested file action pending further information.
Service not available, closing control connection.
Can't open data connection.
Connection closed; transfer aborted.   
Requested file action not taken.   
Requested action aborted. Local error in processing.   
Requested action not taken.   
Syntax error, command unrecognized.   
Syntax error in parameters or arguments.   
Command not implemented.   
Bad sequence of commands.   
Command not implemented for that parameter.   
Not logged in.   
Need account for storing files.   
Requested action not taken.   
Requested action aborted. Page type unknown.   
Requested file action aborted.   
Requested action not taken.

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System status or system help reply
Help message
service ready
service closing transmission channel
Requested mail action okay, completed
The Gordano server is configured so that messages aren't being saved.
The FROM and TO address are taken from the e-mail message headers
Start mail input; end with
service not available, closing transmission channel
Requested action not taken; mailbox unavilable or busy
Requested action aborted, local error in processing
Requested action not taken, insufficient system storage
Syntax error, command unrecognized. Also command line too long
Syntax error in paramaters or arguements
Command not implemented
Bad sequence of commands
Command parameters not implemented
Action not taken. Mailbox unavailable. Not found, not accessible
User not local, please try>
Exceeded storage allocation
Mailbox name not allowed. Mailbox syntax may be incorrect
Transaction failed