Javascript can do it.
var txtFile = new XMLHttpRequest();
txtFile.open("GET", "http://www.mywebsite.com/textfile.txt", true);
txtFile.onreadystatechange = function() {
if(txtFile.readyState === 4) {
if(txtFile.status === 200) {
allText = txtFile.responseText;
lines = txtFile.responseText.split("\n");
}
}
}
txtFile.send(null);
The variable "allText" is what you want to use.