Convert an io.ReadCloser to String
Using Go, we often make HTTP calls these days using net/http, which result in a response of type io.ReadCloser… which are hard to read for the layman (like me). What we really want to the response in the form of a string which we can read. This post will talk about how to convert these ReadCloser into strings. First we’ll look at the problem, then we have two different solutions.
Download a File from a URL
This post shows how you can download a file in Go from a URL. We use the std lib (standard library) http.Get() [docs] and io.Copy() [docs] functions to help us with this. This function should be efficient as it will stream the data into the file, as opposed to downloading it all into memory, then to file. The file will be saved in the same directory as your program. We also show an alternative below if you want to take the filename from the URL.