HTTPBIS Working Group L. Deng INTERNET-DRAFT China Mobile Intended Status: Informational Y. Xia Expires: April 20, 2016 China SARFT S. Duan CATR October 19, 2015 Use-cases for Flow Tagging draft-deng-httpbis-urlid-00 Abstract This document discusses the motivation and use-cases for coding flow tags into resource identification, e.g. URL. Status of this Memo This Internet-Draft is submitted to IETF in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF), its areas, and its working groups. Note that other groups may also distribute working documents as Internet-Drafts. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." The list of current Internet-Drafts can be accessed at http://www.ietf.org/1id-abstracts.html The list of Internet-Draft Shadow Directories can be accessed at http://www.ietf.org/shadow.html Copyright and License Notice Copyright (c) 2013 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (http://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents Expires April 20, 2016 [Page 1] INTERNET DRAFT Oct 19, 2015 carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3 2 Problem Statement . . . . . . . . . . . . . . . . . . . . . . . 3 3 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . 4 4 Discussion . . . . . . . . . . . . . . . . . . . . . . . . . . 4 5 Security Considerations . . . . . . . . . . . . . . . . . . . . 4 6 IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 4 7 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . 4 8 References . . . . . . . . . . . . . . . . . . . . . . . . . . 5 8.1 Normative References . . . . . . . . . . . . . . . . . . . 5 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 6 Expires April 20, 2016 [Page 2] INTERNET DRAFT Oct 19, 2015 1 Introduction The interconnect settlement between the network operators is based on traffic settlement. Because of lack of Internet content resources, the service requests from the small operators usually are redirected to the large operators, which leads to the imbalanced traffic patterns between the small operators and the large operators and force the small operators to pay high cost of traffic settlement to the large operators. To cut short the expense of traffic settlement, deploying a local cache system on the point of interconnection and interworking between two operators is the most direct method taken by the small operators to localize the traffic by caching hot content and avoid cross- boundary expenses for subsequent requests for cached content retrievals. 2 Problem Statement As stated earlier, cache systems are considered to be an effective way to reduce the prohibitive expense for cross-boundary traffic from large ISP with most ICPs to small ISPs providing local services to a specific group of subscribers. The cache system automatically buffers the hotspot resources locally and reduces the traffic from the large operators by feeding the requested content locally. However, observed from the reality of operating, the local cache system can't fully implement traffic localization, as there are vast user requests redirected to other operators by DNS, even when the requested content is actually cached locally. The main reason is that the work pattern of cache system is fully passive and the cache system uses the DPI technology to acquire the URL to identify for buffered content and match them with subsequent content requests, which causes undesirable cache misses in the following two cases: On the one hand, for video websites using the anti-stealing-link mechanism, which updates the URL for the same content periodically with new ones, subsequent requests are therefore subject to change even from the same website. On the other hand, for the requests from the local subscribers to different websites, the cache system cannot recognize a content hit even if the content they are requesting are identical, as their URLs are likely to be different. Expires April 20, 2016 [Page 3] INTERNET DRAFT Oct 19, 2015 3 Requirements In order to improve the hit ratio and actively push the hot resources to the local subscribers, the cache system need a succinct way to learn the buffered contents and can judge the hot content according to the actual content information. It is preferable that no influence to the current application and its protocols. 4 Discussion Content tagging is expected to be helpful to address these requirements. E.g. to mark the content information and encode this flag/tag into the content's URL, which identifies its binary content and other application metadata. The cache system can know the exact content by analyze the content flag in the URL link and need no changes to any protocol. 5 Security Considerations TBA. 6 IANA Considerations There is no IANA action in this document. 7 Acknowledgements TBA. Expires April 20, 2016 [Page 4] INTERNET DRAFT Oct 19, 2015 8 References 8.1 Normative References [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. Expires April 20, 2016 [Page 5] INTERNET DRAFT Oct 19, 2015 Authors' Addresses Lingli Deng China Mobile Email: denglingli@chinamobile.com Yong Xia China SARFT Email: xiayong@abs.ac.cn Shihui Duan China Academy of Telecommunication Research of MIIT Email: duanshihui@catr.cn Expires April 20, 2016 [Page 6]