15.4 Location Headers and Spoofing ..............................154 15.5 Content-Disposition Issues .................................154 15.6 Authentication Credentials and Idle Clients ................155 15.7 Proxies and Caching ........................................155 15.7.1 Denial of Service Attacks on Proxies....................156 16 Acknowledgments .............................................156 17 References ..................................................158 18 Authors' Addresses ..........................................162 19 Appendices ..................................................164 19.1 Internet Media Type message/http and application/http ......164 19.2 Internet Media Type multipart/byteranges ...................165 19.3 Tolerant Applications ......................................166 19.4 Differences Between HTTP Entities and RFC2045 Entities ....167
19.4.1 MIME-Version ............................................167 19.4.2 Conversion to Canonical Form ............................167 19.4.3 Conversion of Date Formats ..............................168 19.4.4 Introduction of Content-Encoding ........................168 19.4.5 No Content-Transfer-Encoding ............................168 19.4.6 Introduction of Transfer-Encoding .......................169 19.4.7 MHtml and Line Length Limitations .......................169 19.5 Additional Features ........................................169 19.5.1 Content-Disposition .....................................170 19.6 Compatibility with Previous Versions .......................170 19.6.1 Changes from HTTP/1.0 ...................................171 19.6.2 Compatibility with HTTP/1.0 Persistent Connections ......172 19.6.3 Changes from RFC2068 ...................................172 20 Index .......................................................175 21 Full Copyright Statement ....................................176
1 Introduction
1.1 Purpose
The Hypertext Transfer Protocol (HTTP) is an application-level protocol for distributed, collaborative, hypermedia information systems. HTTP has been in use by the World-Wide Web global information initiative since 1990. The first version of HTTP, referred to as HTTP/0.9, was a simple protocol for raw data transfer across the Internet. HTTP/1.0, as defined by RFC1945 [6], improved the protocol by allowing messages to be in the format of MIME-like messages, containing metainformation about the data transferred and modifiers on the request/response semantics. However, HTTP/1.0 does not sufficiently take into consideration the effects of hierarchical proxies, caching, the need for persistent connections, or virtual hosts. In addition, the proliferation of incompletely-implemented
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