参考文献

[RFC822]
STANDARD FOR THE FORMAT OF ARPA INTERNET TEXT MESSAGES
[RFC931]
Authentication Server
[RFC1321]
The MD5 Message-Digest Algorithm
[RFC1766]
Tags for the Identification of Languages
[RFC1864]
The Content-MD5 Header Field
[RFC1867]
Form-based File Upload in HTML
[RFC2045]
Multipurpose Internet Mail Extensions (MIME) Part One: Format of Internet Message Bodies
[RFC2109]
HTTP State Management Mechanism
[RFC2227]
Simple Hit-Metering and Usage-Limiting for HTTP
[RFC2231]
MIME Parameter Value and Encode Word Extensions: Character Sets, Languages, and Continuations
[RFC2246]
The TLS Protocol Version 1.0
[RFC2387]
The MIME Multipart/Related Content-type
[RFC2392]
Content-ID and Message-ID Uniform Resource Locators
[RFC2396]
Uniform Resource Identifiers (URI): Generic Syntax
[RFC2397]
The "data" URL scheme
[RFC2518]
HTTP Extensions for Distributed Authoring -- WEBDAV
[RFC2535]
Domain Name System Security Extensions
[RFC2616]
Hypertext Transfer Protocol -- HTTP/1.1
[RFC2617]
HTTP Authentication: Basic and Digest Access Authentication
[RFC2646]
The Text/Plain Format Parameter
[RFC2685]
Virtual Private Networks Identifier