René's URL Explorer Experiment


Title: RFC 2774 - An HTTP Extension Framework

Description: A wide range of applications have proposed various extensions of the HTTP protocol. Current efforts span an enormous range, including distributed authoring, collaboration, printing, and remote procedure call mechanisms. These HTTP extensions are not coordinated, since there has been no standard framework for defining extensions and thus, separation of concerns. This document describes a generic extension mechanism for HTTP, which is designed to address the tension between private agreement and public specification and to accommodate extension of applications using HTTP clients, servers, and proxies. The proposal associates each extension with a globally unique identifier, and uses HTTP header fields to carry the extension identifier and related information between the parties involved in the extended communication.

Mail addresses
DCrocker@UDel-Relay
timbl@w3.org
fielding@ics.uci.edu
frystyk@w3.org
sob@harvard.edu
ned@innosoft.com
nsb@nsb.fv.com
fielding@ics.uci.edu
jg@w3.org
mogul@wrl.dec.com
frystyk@w3.org
timbl@w3.org
sob@harvard.edu
masinter@parc.xerox.com
timbl@w3.org
fielding@ics.uci.edu
masinter@parc.xerox.com
frystyk@microsoft.com
paulle@microsoft.com
lawrence@agranat.com

Generator: http://greenbytes.de/tech/webdav/rfcxml.xslt, Revision 1.1579, 2026/10/05 08:26:26, XSLT vendor: SAXON 6.5.5 from Michael Kay http://saxon.sf.net/

direct link

Domain: greenbytes.de


Hey, it has address:
Henrik Frystyk Nielsen
Microsoft Corporation
1 Microsoft Way
Redmond, WA 98052
USA
EMail: frystyk@microsoft.com

Nonetext/html; charset=utf-8
dcterms.creatorLawrence, S.
dcterms.identifierurn:ietf:rfc:2774
dcterms.issued2000-02
dcterms.abstractA wide range of applications have proposed various extensions of the HTTP protocol. Current efforts span an enormous range, including distributed authoring, collaboration, printing, and remote procedure call mechanisms. These HTTP extensions are not coordinated, since there has been no standard framework for defining extensions and thus, separation of concerns. This document describes a generic extension mechanism for HTTP, which is designed to address the tension between private agreement and public specification and to accommodate extension of applications using HTTP clients, servers, and proxies. The proposal associates each extension with a globally unique identifier, and uses HTTP header fields to carry the extension identifier and related information between the parties involved in the extended communication.
dcterms.isPartOfurn:issn:2070-1721

Links:

H. Nielsenhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors.1
P. Leachhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors.2
Microsofthttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors.2
S. Lawrencehttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors.3
Agranat Systemshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors.3
Status of this Memohttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.status
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.boilerplate.1.p.1
IESG Notehttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.note.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.note.1.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.note.1.p.2
Copyright Noticehttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.copyrightnotice
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.boilerplate.2.p.1
Abstracthttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.abstract
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.abstract.p.1
Table of Contentshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.toc
1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1
Introductionhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1
2.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2
Notational Conventionshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2
3.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3
Extension Declarationshttps://greenbytes.de/tech/webdav/rfc2774.html#extensions.declarations
3.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1
Header Field Prefixeshttps://greenbytes.de/tech/webdav/rfc2774.html#header.field.prefixes
4.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4
Extension Header Fieldshttps://greenbytes.de/tech/webdav/rfc2774.html#extension.header.fields
4.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.1
End-to-End Extensionshttps://greenbytes.de/tech/webdav/rfc2774.html#end-to-end.extensions
4.2.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.2
Hop-by-Hop Extensionshttps://greenbytes.de/tech/webdav/rfc2774.html#hop-by-hop.extensions
4.3.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3
Extension Response Header Fieldshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3
5.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5
Mandatory HTTP Requestshttps://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
5.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1
Fulfilling a Mandatory Requesthttps://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
6.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.6
Mandatory HTTP Responseshttps://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.responses
7.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.7
510 Not Extendedhttps://greenbytes.de/tech/webdav/rfc2774.html#status.510.not.extended
8.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8
Publishing an Extensionhttps://greenbytes.de/tech/webdav/rfc2774.html#publishing.an.extension
9.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.9
Caching Considerationshttps://greenbytes.de/tech/webdav/rfc2774.html#caching.considerations
10.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.10
Security Considerationshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.10
11.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.11
Acknowledgementshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.11
12.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.12
Referenceshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.references
14.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.14
Summary of Protocol Interactionshttps://greenbytes.de/tech/webdav/rfc2774.html#summary.of.protocol.interactions
15.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15
Exampleshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15
15.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.1
User Agent to Origin Serverhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.1
15.2.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.2
User Agent to Origin Server via HTTP/1.1 Proxyhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.2
15.3.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.3
User Agent to Origin Server via HTTP/1.0 Proxyhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.3
Indexhttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.index
13.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.13
Authors' Addresseshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.authors
Intellectual Property and Copyright Statementshttps://greenbytes.de/tech/webdav/rfc2774.html#rfc.ipr
1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1
Introductionhttps://greenbytes.de/tech/webdav/rfc2774.html#n-introduction
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1.p.2
Section 8https://greenbytes.de/tech/webdav/rfc2774.html#publishing.an.extension
Section 3https://greenbytes.de/tech/webdav/rfc2774.html#extensions.declarations
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.1.p.3
2.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2
Notational Conventionshttps://greenbytes.de/tech/webdav/rfc2774.html#n-notational-conventions
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2.p.1
[6]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2119
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2.p.2
[8]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2396
Section 8https://greenbytes.de/tech/webdav/rfc2774.html#publishing.an.extension
[8]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2396
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.2.p.3
3.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3
Extension Declarationshttps://greenbytes.de/tech/webdav/rfc2774.html#extensions.declarations
3.1https://greenbytes.de/tech/webdav/rfc2774.html#header.field.prefixes
Section 4https://greenbytes.de/tech/webdav/rfc2774.html#extension.header.fields
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.1.c
[3]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2026
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.3
Section 8https://greenbytes.de/tech/webdav/rfc2774.html#publishing.an.extension
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.4
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.5
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.2.c
Section 3.1https://greenbytes.de/tech/webdav/rfc2774.html#header.field.prefixes
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.p.6
3.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1
Header Field Prefixeshttps://greenbytes.de/tech/webdav/rfc2774.html#header.field.prefixes
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.3.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.3
Section 4.1https://greenbytes.de/tech/webdav/rfc2774.html#end-to-end.extensions
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.4
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.5
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.6
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.4.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.7
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.5.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.3.1.p.8
4.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4
Extension Header Fieldshttps://greenbytes.de/tech/webdav/rfc2774.html#extension.header.fields
4.1https://greenbytes.de/tech/webdav/rfc2774.html#end-to-end.extensions
4.2https://greenbytes.de/tech/webdav/rfc2774.html#hop-by-hop.extensions
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.p.1
5https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
7https://greenbytes.de/tech/webdav/rfc2774.html#status.510.not.extended
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.p.3
4.1https://greenbytes.de/tech/webdav/rfc2774.html#end-to-end.extensions
4.2https://greenbytes.de/tech/webdav/rfc2774.html#hop-by-hop.extensions
Appendix 14https://greenbytes.de/tech/webdav/rfc2774.html#summary.of.protocol.interactions
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.p.4
Section 5https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
Section 6https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.responses
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.p.5
4.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.1
End-to-End Extensionshttps://greenbytes.de/tech/webdav/rfc2774.html#end-to-end.extensions
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.1.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.6.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.7.c
5https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
6https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.responses
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.1.p.2
4.2.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.2
Hop-by-Hop Extensionshttps://greenbytes.de/tech/webdav/rfc2774.html#hop-by-hop.extensions
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.2.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.8.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.9.c
5https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
6https://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.responses
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.2.p.2
4.3.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3
Extension Response Header Fieldshttps://greenbytes.de/tech/webdav/rfc2774.html#n-extension-response-header-fields
Section 5.1https://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.10.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3.p.3
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.11.c
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3.p.4
Section 5.1https://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.4.3.p.5
5.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5
Mandatory HTTP Requestshttps://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.headers
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.12.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.2
Section 7https://greenbytes.de/tech/webdav/rfc2774.html#status.510.not.extended
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
Section 5.1https://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
Section 5.1https://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.3
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.4
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.5
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.p.6
5.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1
Fulfilling a Mandatory Requesthttps://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.13.c
Section 9https://greenbytes.de/tech/webdav/rfc2774.html#caching.considerations
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1.p.3
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.14.c
[5]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1.p.4
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.15.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.5.1.p.5
6.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.6
Mandatory HTTP Responseshttps://greenbytes.de/tech/webdav/rfc2774.html#mandatory.http.responses
Section 4https://greenbytes.de/tech/webdav/rfc2774.html#extension.header.fields
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.6.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.6.p.2
7.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.7
510 Not Extendedhttps://greenbytes.de/tech/webdav/rfc2774.html#status.510.not.extended
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.7.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.7.p.2
8.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8
Publishing an Extensionhttps://greenbytes.de/tech/webdav/rfc2774.html#publishing.an.extension
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.2
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.3
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.4
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.5
[7]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2324
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.8.p.6
9.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.9
Caching Considerationshttps://greenbytes.de/tech/webdav/rfc2774.html#caching.considerations
Section 5.1https://greenbytes.de/tech/webdav/rfc2774.html#fulfilling.a.mandatory.request
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.9.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.9.p.2
10.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.10
Security Considerationshttps://greenbytes.de/tech/webdav/rfc2774.html#n-security-considerations
[4]https://greenbytes.de/tech/webdav/rfc2774.html#RFC2046
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.10.p.1
11.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.11
Acknowledgementshttps://greenbytes.de/tech/webdav/rfc2774.html#n-acknowledgements
[9]https://greenbytes.de/tech/webdav/rfc2774.html#PEP
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.11.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.11.p.2
12.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.12
1https://greenbytes.de/tech/webdav/rfc2774.html#RFC0822
Standard for the format of ARPA Internet text messageshttps://www.rfc-editor.org/rfc/rfc822.html
STD 11https://www.rfc-editor.org/info/std11
2https://greenbytes.de/tech/webdav/rfc2774.html#RFC1945
Hypertext Transfer Protocol -- HTTP/1.0https://www.rfc-editor.org/rfc/rfc1945.html
3https://greenbytes.de/tech/webdav/rfc2774.html#RFC2026
The Internet Standards Process -- Revision 3https://www.rfc-editor.org/rfc/rfc2026.html
BCP 9https://www.rfc-editor.org/info/bcp9
4https://greenbytes.de/tech/webdav/rfc2774.html#RFC2046
Multipurpose Internet Mail Extensions (MIME) Part Two: Media Typeshttps://www.rfc-editor.org/rfc/rfc2046.html
5https://greenbytes.de/tech/webdav/rfc2774.html#RFC2068
Hypertext Transfer Protocol -- HTTP/1.1https://www.rfc-editor.org/rfc/rfc2068.html
6https://greenbytes.de/tech/webdav/rfc2774.html#RFC2119
Key words for use in RFCs to Indicate Requirement Levelshttps://www.rfc-editor.org/rfc/rfc2119.html
BCP 14https://www.rfc-editor.org/info/bcp14
7https://greenbytes.de/tech/webdav/rfc2774.html#RFC2324
Hyper Text Coffee Pot Control Protocol (HTCPCP/1.0)https://www.rfc-editor.org/rfc/rfc2324.html
8https://greenbytes.de/tech/webdav/rfc2774.html#RFC2396
Uniform Resource Identifiers (URI): Generic Syntaxhttps://www.rfc-editor.org/rfc/rfc2396.html
9https://greenbytes.de/tech/webdav/rfc2774.html#PEP
14.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.14
Summary of Protocol Interactionshttps://greenbytes.de/tech/webdav/rfc2774.html#summary.of.protocol.interactions
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.14.p.1
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.16.c
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.figure.u.17.c
15.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15
Exampleshttps://greenbytes.de/tech/webdav/rfc2774.html#n-examples
https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.p.1
15.1.https://greenbytes.de/tech/webdav/rfc2774.html#rfc.section.15.1
User Agent to Origin Serverhttps://greenbytes.de/tech/webdav/rfc2774.html#n-user-agent-to-origin-server
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3.1https://greenbytes.de/tech/webdav/rfc2774.html#rfc.iref.p.1
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