I am trying to debug a functionality that runs from a plain old Javascript Web Page and requests to a server. This perfectly works on my computer but fails on another (the real target) When it fails, i get an empty string response from the server. Here is the code that build the request
// Send request to web server
var url = "/start?f="+filesDesc[iFile].name+"&ft="+ft+"&t="+time0ms;
var req = new XMLHttpRequest();
if (req) {
req.open("POST", url, true);
// Hack to pass bytes through unprocessed.
req.overrideMimeType('text/plain; charset=x-user-defined');
req.timeout = 2000;
req.onreadystatechange = function(e) {
// In local files, status is 0 upon success in Mozilla Firefox
if(req.readyState === XMLHttpRequest.DONE) {
var status = req.status;
if (status === 0 || (status >= 200 && status < 400)) {
// The request has been completed successfully
console.debug(req.responseText);
} else {
console.debug("startPlaying : error while sending rqst" );
}
}
};
req.send();
}
I noticed that on my computer (working) the output header of the request looks like this :
POST /start?f=2021-02-09_14;05;40&ft=1612880820756.4346&t=1614243685530 HTTP/1.1
On the target computer (FAIL) it looks like :
POST /start?f=2021-02-09_14;05;40&ft=1612879543815&t=1614183852864 undefined
Notice the "undefined" protocol information I wonder what can produce such a difference knowing that :
- The computer are the same 'Asus ZenBook'
- Navigator are the same : Mozilla Firefox 85.0.2 (32 bits)
- Network drivers are the same
- Client and Server code are the same.
This is very strange behaviour. Many thanks for any precious piece of information !
