ajax - How does an XMLHttpRequest response get routed to the right browser-callback? -

-

I have created a webpage which uses Ajax to update some values ​​without reloading the page. I am using an XMLHttpRequest object to send a POST request, and I assign the callback function when the response arrives, and it works fine.

But ... how does the browser in the world know that some data is coming from some IPs: should the port be sent to this particular callback function? I mean, in the worst case, if I have Firefox and IE then make some post requests from the same server almost the same time, and even before the poster requests reach the previous people, how do the data come Is being routed for the correct callback function ??

Each of the HTTP requests made on a separate TCP connection is only for the browser to return to that connection. Waits, then invokes your callback function.

At the lower level, TCP implementation on your OS will be some lookup table mapping source port for each socket (i.e. connections) to open a socket using a different "source port" for each one.

It is worth noting that the number of connections connected to the browser at any one server is limited (usually 2). It was wise in the old days when pages were reloaded to send and receive data, but this is a real nuisance in these enlightened days of AJX. See for an interesting discussion of the problem.


Comments

Post a Comment

Popular posts from this blog

c++ - Linux and clipboard -

-
After selecting the copies of the buffer in Linux, after the text, we can click and paste the button between the mouse. I think there is a special buffer for this, I want to use it. Programming Language: C ++ Your Library: Qt Thanks. There is just one more correct answer than Paul Dixon, which answers your needs: / P > QClipboard * clipboard = QApplication :: clipboard (); CastString Selected Text = Clipboard-> Text (QClipboard :: Selection);
Read more

What is expire header and how to achive them in ASP.NET and PHP? -

-
I have examined the performance statistics of my website today. I have received a warning (or error may occur) that is given below Add Terminal Headers Here are 15 static components without a 15-futures end date * (no end) Http://www.example.com/video/css/global.css * (no time limit) http://www.example.com/video/js/global.js * (no expiration ) Http: //www.example.com/video/images/main-bg.png what it means and how to achieve it both in PHP and ASP.Net. I am on a shared hosting server, so please tell me some ways to use the code, because I can not make any modifications at the end of the server. If I expire the header, then there is no chance that if I make changes to the CSS, then the user will not be able to remove them immediately because CSS and other files have a fixed time limit (1 month, week ) Are cached for. Is Is there any harm to using PHP? $ time = time () + 3 * 24 * 60 * 60; // 3 day headings ('End:'. GMDAT ('D, D MYH: i: s \ g \ m \ t',
Read more

sql server - How can I determine which of my SQL 2005 statistics are unused? -

-
After a few years, one of my biggest databases has deposited 73 figures out of its largest tables. With Indexes, I can run many types of reports and queries, how often / heavily specific indexes are used. What is an equivalent for data? We are running SQL 2005. To make statistics automatically managed and honest, I would like to "update statistics", "create statistics" and There is no information about any management except "drop statistics" orders. In theory, UPDATE should handle the addition and removal of statistical data. In addition, I've never heard about the amount of storage or storage taking in large amounts, so I'm not sure whether there is any reason for the alarm or not. If you are seeing a potential problem, then I would suggest running an update before, if it does not clean it, it is leaving and then it appears to be safe operation (because it is the only query optimizer Is for). I will not leave "left" in the
Read more