server.arg() is broken for POST requests on 2.4.0?

[cwalger]

in 2.3.0 this was working as expected:

in javascript, i am using createXmlHttpObject(), xmlHttp.open('POST', abc.com, true), then xmlHttp.send('item='+value), where value is a string to identify which button was pushed

in 2.3.0, (server.arg(0)=="off") would return true,

but in 2.4.0, only (server.arg(0)=="item=off") returns true,

Thanks!

[cwalger]

Sorry, I think I have found an answer in #3791:

"In my ajax, I did not have any "Content-Type" Set. This leads to the ESP 2.4.0-rc2 spitting the POST Data as "Plain", and unparsed"

Solution looks to be adding:
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");