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{{Short description|Automated reporting of web page changes}}
'''Change detection and notification''' ('''CDN''') is the automatic detection of changes made to [[World Wide Web]] pages and notification to interested users by email or other means.<ref>{{Cite book|last1= Mallawaarachchi|first1=Vijini |last2=Meegahapola |first2=Lakmal |last3=Alwis |first3=Roshan |last4=Heshan |first4=Eranga |last5=Meedeniya |first5=Dulani |last6=Jayarathna |first6=Sampath |url=http://worldcat.org/oclc/1201518429|title=Change Detection and Notification of Web Pages: A Survey|date=2020-05-14|oclc=1201518429|doi= 10.1145/3369876|arxiv=1901.02660|bibcode=2019arXiv190102660M|s2cid=57759312 }}</ref> ▼
{{Distinguish|content delivery network}}
▲'''Change detection and notification''' ('''CDN''') is the automatic detection of changes made to
Whereas [[search engine]]s are designed to find web pages, CDN systems are designed to monitor changes to web pages. Before change detection and notification, it was necessary for users to manually check for web page changes, either by revisiting web sites or periodically searching again. Efficient and effective change detection and notification is hampered by the fact that most servers do not accurately track content changes through Last-Modified or [[HTTP ETag|ETag]] web-server headers. In 2019 a comprehensive analysis regarding CDN systems was
==History==
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* {{Cite book | last1 = Chakravarthy | first1 = S. | last2 = Hara | first2 = S. C. H. | chapter = Automating Change Detection and Notification of Web Pages (Invited Paper) | title = 17th International Conference on Database and Expert Systems Applications (DEXA'06) | pages = 465 | year = 2006 | isbn = 0-7695-2641-1 | doi = 10.1109/DEXA.2006.34| s2cid = 6395251 }}
* {{cite journal |last1= Shobhna|first1=Bansal |last2=Chadhaury |first2=Manoj |date=June 2013 |title=A Survey on Web Page Change Detection System Using Different Approaches |url=http://www.ijcsmc.com/docs/papers/June2013/V2I6201391.pdf |journal=International Journal of Computer Science and Mobile Computing |publisher=IJCSMC |volume= 2 |issue=6 |pages=294–299 | issn=2320-088X |access-date=8 September 2016}}
*[https://github.com/dgtlmoon/changedetection.io changedetection.io github] Self-hosted website change detection and notification▼
[[Category:Change detection and notification| ]]
▲*[https://changedetection.io changedetection.io] Self-hosted website change detection and notification
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