CSE 278 Lecture Notes - Lecture 9: Media Type, Network Congestion, Application Layer
27 Sep 2018
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Document Summary
In both ose and tcp/ip models, this layer is at top. Together with transport layer, this is most important for application programmer. Many important software components use networking, like file transfer, mail, and web services. Is the application protocol for web pages in html. For most part, http runs the www. Soon realized protocol must handle two-way communication. The www server normally listens on the port 80 and may accept connection simultaneously. In its beginnings, http established a tcp connection, and released immediately. To reduce network congestion, pages that are likely to be reused are cached. Early in development, http evolved to produce dynamic content, with software running on both sides. Much more complicated, as it must access other websites, handle client cookies, determine mime type . Server relies heavily on multithreading due to high computation levels. Email is exchanged between mail servers using this. Smpt has been around a long time (rfc 821/5322)
