Export query_build and query_parse.

[jjesusfilho]

Functions query_build and query_parse are very useful in the day to day work of web scraping. I think it would be great if the they were exported.

[hadley]

What's stopping you from using req_url_query()? Do you have some sample code you can share?

[jjesusfilho]

When someone wants to scrape a web page that uses POST method, the first thing to do is to inspect how the form is built. When you copy the form, it comes as raw data: "x=value1&y=value2&z=value3". query_build is useful to convert it to a list to be used as body in POST request.

The other way around, though less frequent, is also possible, e.g., when you want to convert a list to raw data so you can use it as script in RSelenium:

library(RSelenium)
remDr <- remoteDriver$new()

remDr$open()

js <- "var xhr = new XMLHttpRequest();
xhr.open('POST', 'http://httpbin.org/post', false);
xhr.setRequestHeader('Content-type', 'application/x-www-form-urlencoded');

xhr.send('x=value1&y=value2&z=value3');
return xhr.response;"

remDr$executeScript(js)

[hadley]

Ah, good point. Thanks!