INTERNET-DRAFT Mykyta Yevstifeyev
Intended Status: Standards Track November 22, 2010
Expires: May 26, 2011
'Headers-Not-Recognized' HTTP Header Field
<draft-yevstifeyev-http-headers-not-recognized-02>
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INTERNET DRAFT Headers Not Recognized for HTTP November 22, 2010
Abstract
This document defines mechanism which allows HTTP servers to notify
clients about not recognized or not proceed headers.
Table of Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1 Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2 Conventions . . . . . . . . . . . . . . . . . . . . . . . . 3
1.2.1 Conformance Criteria . . . . . . . . . . . . . . . . . 3
1.2.2 Syntax Notation . . . . . . . . . . . . . . . . . . . . 3
1.2.3 Terminology . . . . . . . . . . . . . . . . . . . . . . 3
2 General Overview . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Technical Overview . . . . . . . . . . . . . . . . . . . . . . . 4
3.1 Model of Work . . . . . . . . . . . . . . . . . . . . . . . 4
3.2 Syntax . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
4 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . . 5
5 Security Considerations . . . . . . . . . . . . . . . . . . . . . 5
6 Normative References . . . . . . . . . . . . . . . . . . . . . . 5
Author's Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6
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1 Introduction
1.1 Motivation
HTTP is one of the most widely-used protocols in the Internet. One of
the things which made it so popular is extensibility. One can easily
add any header to the HTTP message. However, servers are not able to
support all the HTTP headers. Generally, if a server does not
recognize the header, it simply ignores it. The client is not
notified about not processed headers.
This document proposes mechanism which allows servers to notify
clients about not processes or not recognized headers.
The proposal is to send a response with definite header fields to the
client if one or more headers of request were not processed. This
document defines 'Headers-Not-Recognized' header field to be used in
such occasion.
1.2 Conventions
1.2.1 Conformance Criteria
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [RFC2119].
1.2.2 Syntax Notation
This specification uses the Augmented Backus-Naur Form (ABNF)
notation of [RFC5234].
The following core rules are included by reference, as defined in
[RFC5234], Appendix B.1: ALPHA (letters), CR (carriage return), CRLF
(CR LF), CTL (controls), DIGIT (decimal 0-9), DQUOTE (double quote),
HEXDIG (hexadecimal 0-9/A-F/a-f), LF (line feed), OCTET (any 8-bit
sequence of data), SP (space), HTAB (horizontal tab), CHAR (any US-
ASCII character), VCHAR (any visible US-ASCII character), and WSP
(whitespace).
1.2.3 Terminology
The terms user agent, client, server, proxy, and origin server have
the same meaning as in the HTTP/1.1 specification ([RFC2616], Section
1.3).
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2 General Overview
'Headers-Not-Recognized' HTTP header field SHOULD be put to the
response if one or more headers of the response are not recognized.
Information about what headers were not processed MUST be put in this
header field.
3 Technical Overview
3.1 Model of Work
If a server receives request with unknown (for it) headers, it SHOULD
send a response with 'Headers-Not-Recognized' headers field.
Information about what headers were not recognized MUST be put into
this header. If a client receives such a response, it SHOULD avoid
sending requests with headers mentioned in the 'Headers-Not-
Recognized' header field.
3.2 Syntax
'Headers-Not-Recognized' header field has the following format:
headers_not_recognized = header_name [*("," header name)]
header_name = <name of not recognized header>
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4 IANA Considerations
The permanent message header field registry should be updated with
the following registration:
Header field name: Headers-Not-Recognized
Applicable protocol: http
Status: standard
Specification document: this specification
5 Security Considerations
Security considerations are not discussed by this document.
6 Normative References
[RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119, March 1997.
[RFC2616] Fielding, R., Gettys, J., Mogul, J., Frystyk, H.,
Masinter, L., Leach, P., and T. Berners-Lee, "Hypertext
Transfer Protocol -- HTTP/1.1", RFC 2616, June 1999.
[RFC5234] Crocker, D., Ed., and P. Overell, "Augmented BNF for
Syntax Specifications: ABNF", STD 68, RFC 5234, January
2008.
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Author's Addresses
Mykyta Yevstifeyev
8 Kuzovkov St., flat 25
Kotovsk, Ukraine
EMail: evnikita2@gmail.com
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