April 2015
Intermediate to advanced
288 pages
6h 9m
German
Content preview from HTML5, JavaScript und jQueryBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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16 Server-Sent Events und WebSockets
HTTP als Kommunikationsprotokoll
Für die Entwicklung umfangreicher und dynamischer Webanwendungen ist AJAX eine enorm wichtige Technik. Dennoch sollten wir uns klarmachen, dass AJAX dasselbe Kommunikationsprotokoll nutzt, das schon seit Anbeginn des Internets verwendet wird: Der Client (Webbrowser) sendet eine HTTP-Anfrage an den Server (einen Webserver). Der Webserver antwortet mit einer synchronen HTTP-Antwort. Sobald der Client diese empfangen hat, wird die Kommunikation als beendet betrachtet.
Diese Technik funktioniert in den meisten Szenarien gut. Für zwei Situationen ist sie jedoch nicht gut geeignet:
Der Server möchte von sich aus Informationen – etwa eine Benachrichtigung – an den Client senden (pushen). ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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