HTTP

Intermediate Importing Data in R

Filip Schouwenaars

Instructor, DataCamp

Data on the web

Already worked with it!
Many packages handle it for you
File formats useful for web technology
JSON

HTTP

HyperText Transfer Protocol
Rules about data exchange between computers
Language of the web

ch_3_1_slide.011.png

HTTP

HyperText Transfer Protocol
Rules about data exchange between computers
Language of the web

ch_3_1_slide.012.png

HTTP

HyperText Transfer Protocol
Rules about data exchange between computers
Language of the web

ch_3_1_slide.013.png

HTTP

HyperText Transfer Protocol
Rules about data exchange between computers
Language of the web

ch_3_1_slide.014.png

HTTP

HyperText Transfer Protocol
Rules about data exchange between computers
Language of the web

ch_3_1_slide.015.png

Example: CSV

http://assets.datacamp.com/ ... /states.csv

# Manually download file through web browser

read.csv(url("path/to/states.csv"))

         state    capital pop_mill area_sqm
1 South Dakota     Pierre    0.853    77116
2     New York     Albany   19.746    54555
3       Oregon      Salem    3.970    98381
4      Vermont Montpelier    0.627     9616
5       Hawaii   Honolulu    1.420    10931

Example: CSV

read.csv("http://assets.datacamp.com/course/
                 importing_data_into_r/states.csv")

         state    capital pop_mill area_sqm
1 South Dakota     Pierre    0.853    77116
2     New York     Albany   19.746    54555
3       Oregon      Salem    3.970    98381
4      Vermont Montpelier    0.627     9616
5       Hawaii   Honolulu    1.420    10931

R sees it’s a URL, does GET request, and reads in the CSV file

Example: CSV

read.csv("http://assets.datacamp.com/course/
                 importing_data_into_r/states.csv")

         state    capital pop_mill area_sqm
1 South Dakota     Pierre    0.853    77116
2     New York     Albany   19.746    54555
3       Oregon      Salem    3.970    98381
4      Vermont Montpelier    0.627     9616
5       Hawaii   Honolulu    1.420    10931

HTTPS support since R version 3.2.2

Let's practice!

Intermediate Importing Data in R