Is there a method to verify if a specific ajax request is asynchronous or synchronous using Browser Dev Tools such as Chrome Developer Tools or Firebug?
The HTTP Request Header for an ajax request does not specify whether it is sync or async.
X-Requested-With:XMLHttpRequest
Unfortunately, you are not able to directly modify that, but there is a workaround you can use by running this in the console or adding it to your code:
XMLHttpRequest.prototype.open = (function(open){
return function(method, url, async, user, password) {
console.log("xhr call: "+url +"isAsync: "+async);
open.apply(this, arguments);
};
})(XMLHttpRequest.prototype.open);
This code snippet will log the information for you! Hopefully, it proves to be helpful.
If you're on the lookout for a solution, I hope this guide can assist you!
To troubleshoot in Chrome browser, go to rightClick/inspect/networkTab/xhr? and hover over the timeline where your requests are being processed like shown in the image below:
https://i.stack.imgur.com/XHE9K.png
HERE'S MY ASYNC CODE (default ajax)
`$.ajax({
type: "GET",
contentType: "application/json", // data type of request
url: //url,
data: //data,
dataType: "json", // data type of response
success: function (result) {
// code goes here
}
});`
I encountered issues while making multiple asynchronous ajax calls to localhost where each call depended on the previous response. The responses should have been received in order but due to simultaneous sending of requests, they arrived out of sequence. Refer to the timing diagram below showing the problem (check the waterfall tab).
https://i.stack.imgur.com/HDuKV.png
THIS IS MY SYNC CALLS CODE (async: false in ajax)
$.ajax({
async: false,
type: "GET",
contentType: "application/json", // data type of request
url: //url,
data: //data,
dataType: "json", // data type of response
success: function (result) {
// code block here
}
});
https://i.stack.imgur.com/MRVEt.png
How can one confirm if async: false is functioning correctly?
In async mode, the timings of ajax calls overlap, whereas in synchronous mode (async: false), the timings are clearly separate, thereby validating that sync calls [async: false] are operating effectively. If there's still overlapping timings, then it indicates an issue with synchronous calls, unlike my scenario.
When it comes to ajax requests, they are typically asynchronous by default. However, if you specifically want a request to be synchronous, that's when the term Asynchronous JavaScript and XML (AJAX) comes into play. You can make an ajax request synchronous by setting the third parameter in the open method of an XMLHTTPRequest object to false like this:
var xhr = new XMLHttpRequest();
xhr.open("POST", "file-to-get.php", false);
If the third parameter is set to false, it specifies the request as synchronous. Keep in mind that by default it is set to true.
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