CS2910 Week 4, Class 1 Today Encoding in Python – Review Quiz – Encoding in Python Introduction to HTTP SE-2811 Slide design: Dr. Mark L. Hornick Content:

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CS2910 Week 4, Class 1 Today Encoding in Python – Review Quiz – Encoding in Python Introduction to HTTP SE-2811 Slide design: Dr. Mark L. Hornick Content: Dr. Hornick Errors: Dr. Yoder 1

Muddiest Points Understanding the commands to switch between the different variable types.conversions Using pack command in the cases of little endian format.pack and unpack the inputs and outputs of pack and unpackpack and unpack how python interprets/ stores variablesinterpreting storage I'm still a bit shaky on the Python commands and conversions, and why/when to use them.conversions python's classes 'self'OO in Python Tuples?tuples Using pack and unpackpack and unpack Understanding how python determines how to interpret a variable (as a string, as an int, etc). interpreting storage When to use a character, number, or hex represent a value of interest interpreting storage SE-2811 Dr.Yoder 2

Encoding in Python How to encode a binary Mega? 1,048,576 = = 2 20 In binary: As 32-bits, in hexadecimal: As big-endian string in Python: '\x00\x10\x00\x00' SE-2811 Dr.Yoder 3

HTTP HyperText Transfer Protocol Communication between browser and server Used for transmitting HTML (HyperText Markup Language), images, CSS (Cascaded Style Sheets), etc. SE-2811 Dr.Yoder 4

RFC's RFC "Request for Comments" Internet Standards Defined in RFC 1945 (HTTP1.0, "Informational",1996) RFC 2616 (HTTP1.1, "Draft Standard",1999) RFCs 7230,7231,7232,7233,7234, and 7235 (HTTP1.1, "Proposed Standard",2014) RFC 7540 (HTTP2, "Proposed Standard",2015) 5

At the transport layer Uses TCP for reliable, two-way transfer Always in pairs: Client sends request Server sends response Persistent: Multiple requests/responses over same TCP channel SE-2811 Dr.Yoder 6

The bits and bytes of HTTP HTTP is encoded in ASCII Except payload, e.g. when sending images, zipped data, etc. SE-2811 Dr.Yoder 7

SE-2811 Dr. Josiah Yoder 8

Acknowledgement This course is based on the text Computer Networking: A Top Down Approach 6 th edition Jim Kurose, Keith Ross Addison-Wesley March 2012 SE-2811 Dr. Josiah Yoder 9