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error "net::ERR_CERT_AUTHORITY_INVALID" in AJAX

I am trying to make an http request like:
function foo() {
$.ajax({
async: true,
crossDomain: true,
url: "https://192.168.xxx.xxx/api/Domains/GetDomains/false",
type: "GET",
contentType: false,
success: function (data, textStatus, jqXHR) {
console.log(data);
},
error: function (jqXHR, textStatus, errorThrown) {
console.log(jqXHR.responseText);
}
});
}
$(document).ready(function () {
foo();
});
But Im getting error:
I tried with postman and it worked, why Im getting this error when I try via code?

Handle undefined data in ajax request

I have the below ajax call and sometimes the request stops the page from loading as the data being passed is undefined.
I there a way to put a condition to handle the request if it has values that are undefined?
Can it be wrapped with a if condition?
newuser is not defined
$.ajax(
{
url: 'sample.aspx,
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data){
...
} ,
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
});

Simplest way would be to use a pipe:
$.ajax({url: 'sample.aspx',
data: newuser || {},//continue here...
If your variable was not initialized, empty object will be sent instead.
That's if and only if you can handle empty "newuser" for some reason.
I'm assuming that not closed URL is just a mistake in copy-paste, and not actually part of your code.

how about
if(newuser)
{
$.ajax(
{
url: 'sample.aspx,
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data){
...
} ,
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
});
}

If you are unable to handle an empty newuser you can try something like this:
if (newuser) {
$.ajax({
url: 'sample.aspx',
data: newuser,
type: 'POST',
dataType: 'html',
success: function(data) {
...
},
error: function(XMLHttpRequest, textStatus, errorThrown) {
}
});
}

AJAX post is empty on the server side (PHP)

I am making an AJAX request to a PHP controller, by using jQuery ajax, but when trying to get the posted data with PHP the $_POST is empty. Below is the actual function:
function GetSeriesForManufacturer(manuf) {
selectedmanufacturer = manuf;
//Make an AJax Call For Getting Series Of Manufacturer
var series = null;
$.ajax({
type: "POST",
url: url,
data: "{manufacturer:'" + selectedmanufacturer + "'}",
contentType: "application/json", //; charset=utf-8",
dataType: "json",
cache: false,
async: false,
success: function (response) {
//remove loading gif
$(".loading").hide();
//Append Data
AppendSeries($.parseJSON(response.text), selectedmanufacturer);
//Custom Scrollbar Call
$('.MatchingSeries ul').mCustomScrollbar();
},
error: function (XMLHttpRequest, textStatus, errorThrown) { }
});
}
Thanks in advance!

First, you don't need to stringify data. Just send object literal is ok.
data: {manufacturer: selectedmanufacturer},
Second, you don't need this line:
contentType: "application/json",

Let jQuery do the encoding for you:
$.ajax({
type: "POST",
url: url,
data: {
manufacturer: selectedmanufacturer
},
contentType: "application/json", //; charset=utf-8",
dataType: "json",
cache: false,
async: false,
success: function (response) {
...
},
error: function (XMLHttpRequest, textStatus, errorThrown) { }});

Ajax call to database not works

in my application I have to make an ajax call to php file.it works proper in all devices. but when I tried it on ipad mini it not calls the php, so that the functionality not works, I've seen so many question about this problem and edited my code like this.
jQuery.ajax({
type: "POST",
async: true,
cache: false,
url: "directory/phpfile.php",
data: data,
success: function(response) {
}
});
my old code is
jQuery.ajax({
type: "POST",
url: "wp-admin/admin-ajax.php",
data: data,
success: function(response) {
}
});
and the problem still cant resolve . so please any one tell me how to resolve this.

Please use this code
$("#ajaxform").submit(function(e)
{
var postData = $(this).serializeArray();
var formURL = $(this).attr("action");
$.ajax(
{
url : formURL,
type: "POST",
data : postData,
success:function(data, textStatus, jqXHR)
{
//data: return data from server
},
error: function(jqXHR, textStatus, errorThrown)
{
//if fails
}
});
e.preventDefault(); //STOP default action
e.unbind(); //unbind. to stop multiple form submit.
});
$("#ajaxform").submit(); //Submit the FORM

<script type='text/javascript'>
$(document).ready(function startAjax() {
$.ajax({
type: "POST",
url: "test.php",
data: "name=name&location=location",
success: function(msg){
alert( "Data Saved: " + msg );
}
});
});

Not getting data from JSON file

I am executing this code:
var element=null;
$.ajax({
type: 'GET',
async: false,
url: "C:\Users\myDir\Desktop\Project\jsonfile.json",
dataType: 'json',
success : function(data) {
element=data;
}
});
JSON structure:
{
"info":[
{
"a1": "Ram",
"b1": "P123"
},
{
"a1": "ROM",
"b1": "P245"
}
]
}
but i am getting nothing in variable

Check for any error in the ajax using
var element=null;
$.ajax({
type: 'GET',
async: false,
url: "jsonfile.json",//Edited
dataType: 'json',
success : function(data) {
element=data;
}
error: function(jqXHR, textStatus, errorThrown) {
console.log(textStatus, errorThrown);
}
});

may be the permission issue for the file. insert the json file with all your other code files and give relative path in the url
$.ajax({
type: 'GET',
async: false,
url: "jsonfile.json",
dataType: 'json',
success : function(data) {
element=data;
}
});
//location of json file is same as the file making ajax call