Записки программиста, обо всем и ни о чем. Но, наверное, больше профессионального.

2011-10-27

IfModifiedSinceWebClient

Есть в .NET несколько загадочный (в своей ограниченности), но в то же время удобный класс WebClient. И как показывает практика, его несложно расширить под свою задачу:

"You are now up to date." [IfModifiedSinceWebClient makes it easy to keep a local file in sync with online content - and do so asynchronously]
Recently, I was working with a program that needs to cache the content of a network file on the local disk for faster, easier access. The network file is expected to change periodically according to an unpredictable schedule; the objective is to keep the local file in "close" sync with the online copy without a lot of cost or complex protocols.
...
we can improve things easily: the HTTP specification defines the If-Modified-Since header for exactly this purpose! By including that header with the HTTP request, the server "knows" whether the local file is out of date

blogs.msdn.com/b/delay/archive/2011/10/18/ you-are-now-up-to-date ifmodifiedsincewebclient-makes-it-easy-to-keep-a-local-file-in-sync-with-online-content-and-do-so-asynchronously

Исходный код прилагается.

Комментариев нет:

Отправить комментарий

Архив блога

Ярлыки

linux (241) python (191) citation (186) web-develop (170) gov.ru (159) video (124) бытовуха (115) sysadm (100) GIS (97) Zope(Plone) (88) бурчалки (84) Book (83) programming (82) грабли (77) Fun (76) development (73) windsurfing (72) Microsoft (64) hiload (62) internet provider (57) opensource (57) security (57) опыт (55) movie (52) Wisdom (51) ML (47) driving (45) hardware (45) language (45) money (42) JS (41) curse (40) bigdata (39) DBMS (38) ArcGIS (34) history (31) PDA (30) howto (30) holyday (29) Google (27) Oracle (27) tourism (27) virtbox (27) health (26) vacation (24) AI (23) Autodesk (23) SQL (23) Java (22) humor (22) knowledge (22) translate (20) CSS (19) cheatsheet (19) hack (19) Apache (16) Manager (15) web-browser (15) Никонов (15) functional programming (14) happiness (14) music (14) todo (14) Klaipeda (13) PHP (13) course (13) scala (13) weapon (13) HTTP. Apache (12) SSH (12) frameworks (12) hero (12) im (12) settings (12) HTML (11) SciTE (11) USA (11) crypto (11) game (11) map (11) HTTPD (9) ODF (9) Photo (9) купи/продай (9) benchmark (8) documentation (8) 3D (7) CS (7) DNS (7) NoSQL (7) cloud (7) django (7) gun (7) matroska (7) telephony (7) Microsoft Office (6) VCS (6) bluetooth (6) pidgin (6) proxy (6) Donald Knuth (5) ETL (5) NVIDIA (5) Palanga (5) REST (5) bash (5) flash (5) keyboard (5) price (5) samba (5) CGI (4) LISP (4) RoR (4) cache (4) car (4) display (4) holywar (4) nginx (4) pistol (4) spark (4) xml (4) Лебедев (4) IDE (3) IE8 (3) J2EE (3) NTFS (3) RDP (3) holiday (3) mount (3) Гоблин (3) кухня (3) урюк (3) AMQP (2) ERP (2) IE7 (2) NAS (2) Naudoc (2) PDF (2) address (2) air (2) british (2) coffee (2) fitness (2) font (2) ftp (2) fuckup (2) messaging (2) notify (2) sharepoint (2) ssl/tls (2) stardict (2) tests (2) tunnel (2) udev (2) APT (1) CRUD (1) Canyonlands (1) Cyprus (1) DVDShrink (1) Jabber (1) K9Copy (1) Matlab (1) Portugal (1) VBA (1) WD My Book (1) autoit (1) bike (1) cannabis (1) chat (1) concurrent (1) dbf (1) ext4 (1) idioten (1) join (1) krusader (1) license (1) life (1) migration (1) mindmap (1) navitel (1) pneumatic weapon (1) quiz (1) regexp (1) robot (1) science (1) serialization (1) spatial (1) tie (1) vim (1) Науру (1) крысы (1) налоги (1) пианино (1)