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I need to know the difference between CURL (in PHP) and AJAX (in Javascript) when it comes to know Source of the request.
UPDATED: What I want to know is if I am generating requests using AJAX what sender IP address would be received at the server side with the packet as source? The same is with CURL and for all users it will single ip address be sent. But is that the same case with JS? JS executes at the client side so would it be client IP address?
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While JQuery is a library for better client-side web page development, AJAX is a technique of doing XMLHttpRequest to the server from the web page and sending/retrieving data used on a web page. AJAX can change data without reloading the web page. In other words, it implements partial server requests.
Fetch is compatible with all recent browsers including Edge, but not with Internet Explorer. Therefore, if you are looking for maximum compatibility, you will continue to use Ajax to update a web page. If you also want to interact with the server, the WebSocket object is also more appropriate than fetch.
AJAX itself will not increase or decrease the security of your site, at least if its implementation is elaborate. The client (browser) will have turned JavaScript on or off. If it is turned on, there may be more insecurities on the client side, but this won't affect your server and hence your site.
Ajax allows us to send and receive data from the webserver asynchronously without interfering with the current state or behavior of the web page or application. XHR is the XMLHttpRequest Object which interacts with the server.
cURL is a server-side process. This means that it will be called before the page is rendered and has nothing to do with the client's capabilities.
AJAX, however, is a client-side call. This means that it will not be executed until the client loads the page (or at least that piece of code is seen and executed, but this typically works on document.ready).
If you're looking to retrieve the information and dump it to the user immediately then cURL is your best bet. If you'd like to do a progressive load (dump the page, then retrieve the content for a "seamless" load to the user) then AJAX is the best bet. All th while keep in mind, though in today's day and age it's semi trivial, AJAX may be disabled in cases of FireFox's NoScript extension.
That being said, the source of the cURL execution will be on the server. The source of the AJAX request will be on a per-client basis. Neither of which provide a secure means of detection (server-side) to know who sent what (as headers can be altered).
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