POST from XMLHttp with parameters

Question

I\'m trying to post data to a PHP page and check the response. Here is an example. What is wrong with this code?

index.html

Answer 1

I figured it out. I needed to set the request header.

xmlhttp.open("POST", "ajax.php", true);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.send("foo=" + foo + "&bar=" + bar);

source1

source2